{"id":37418,"date":"2026-10-15T17:05:25","date_gmt":"2026-10-15T09:05:25","guid":{"rendered":"https:\/\/www.bestpcbs.com\/blog\/2026\/10\/pcb-trace-inductance-calculator\/"},"modified":"2026-10-15T17:33:17","modified_gmt":"2026-10-15T09:33:17","slug":"pcb-trace-inductance-calculator","status":"publish","type":"post","link":"https:\/\/www.bestpcbs.com\/blog\/2026\/10\/pcb-trace-inductance-calculator\/","title":{"rendered":"How Do You Use a PCB Trace Inductance Calculator?"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_85 ez-toc-wrap-left counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.bestpcbs.com\/blog\/2026\/10\/pcb-trace-inductance-calculator\/#PCB_Trace_Inductance_Calculator\" >PCB Trace Inductance Calculator<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.bestpcbs.com\/blog\/2026\/10\/pcb-trace-inductance-calculator\/#What_Is_PCB_Trace_Inductance\" >What Is PCB Trace Inductance?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.bestpcbs.com\/blog\/2026\/10\/pcb-trace-inductance-calculator\/#What_Inputs_Are_Needed_to_Calculate_PCB_Trace_Inductance\" >What Inputs Are Needed to Calculate PCB Trace Inductance?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.bestpcbs.com\/blog\/2026\/10\/pcb-trace-inductance-calculator\/#How_Is_PCB_Trace_Inductance_Calculated\" >How Is PCB Trace Inductance Calculated?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.bestpcbs.com\/blog\/2026\/10\/pcb-trace-inductance-calculator\/#How_Much_Inductance_Does_a_10_mm_PCB_Trace_Have\" >How Much Inductance Does a 10 mm PCB Trace Have?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.bestpcbs.com\/blog\/2026\/10\/pcb-trace-inductance-calculator\/#How_Does_the_Return_Path_Affect_PCB_Trace_Inductance\" >How Does the Return Path Affect PCB Trace Inductance?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.bestpcbs.com\/blog\/2026\/10\/pcb-trace-inductance-calculator\/#How_Do_You_Calculate_Inductance_for_a_PCB_Trace_over_a_Ground_Plane\" >How Do You Calculate Inductance for a PCB Trace over a Ground Plane?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.bestpcbs.com\/blog\/2026\/10\/pcb-trace-inductance-calculator\/#How_Do_You_Calculate_PCB_Trace_Inductive_Reactance\" >How Do You Calculate PCB Trace Inductive Reactance?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.bestpcbs.com\/blog\/2026\/10\/pcb-trace-inductance-calculator\/#How_Does_PCB_Trace_Inductance_Cause_Voltage_Spikes\" >How Does PCB Trace Inductance Cause Voltage Spikes?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/www.bestpcbs.com\/blog\/2026\/10\/pcb-trace-inductance-calculator\/#How_Can_You_Reduce_PCB_Trace_Inductance\" >How Can You Reduce PCB Trace Inductance?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/www.bestpcbs.com\/blog\/2026\/10\/pcb-trace-inductance-calculator\/#How_Do_PCB_Trace_Tolerances_Affect_Inductance\" >How Do PCB Trace Tolerances Affect Inductance?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/www.bestpcbs.com\/blog\/2026\/10\/pcb-trace-inductance-calculator\/#PCB_Trace_Inductance_Calculator_FAQs\" >PCB Trace Inductance Calculator FAQs<\/a><\/li><\/ul><\/nav><\/div>\n<div class=\"yzp-no-index\"><\/div><p>A <a href=\"https:\/\/www.bestpcbs.com\/blog\/2026\/10\/pcb-trace-inductance-calculator\/\">PCB trace inductance calculator<\/a> estimates the inductance added by a copper connection. Enter the trace length, width and finished copper thickness for an isolated straight-strip estimate. For a trace with a defined return plane, select the transmission-line model and enter the characteristic impedance and effective relative permittivity for that stack-up. The two results describe different electromagnetic conditions and should not be substituted for each other.<\/p>\n<figure class=\"wp-block-image aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/10\/pcb-trace-inductance-calculator-hero.jpg\" width=\"600\" height=\"338\" alt=\"Technical illustration of a straight copper PCB trace with length, width and copper thickness dimensions\"><\/figure>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"PCB_Trace_Inductance_Calculator\"><\/span>PCB Trace Inductance Calculator<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>The default inputs in this <strong>online PCB trace inductance calculator<\/strong> are a 10 mm long, 0.25 mm wide trace with 35 micrometer copper. Its estimated partial self-inductance is <strong>9.515 nH<\/strong>. Changing a length unit preserves the entered physical dimensions.<\/p>\n<style>#bestpcbs-trace-inductance-1357{box-sizing:border-box;border:1px solid #b6c1c7;border-radius:6px;background:#f7f9fa;padding:20px;margin:20px 0;color:#202a30;font:15px\/1.5 Arial,Helvetica,sans-serif;letter-spacing:0;max-width:100%;overflow:hidden}\n#bestpcbs-trace-inductance-1357 *{box-sizing:border-box;letter-spacing:0}\n#bestpcbs-trace-inductance-1357 [hidden]{display:none!important}\n#bestpcbs-trace-inductance-1357 .trace-models{border:0;border-bottom:1px solid #cad4d8;margin:0 0 18px;padding:0 0 14px;display:flex;gap:16px;flex-wrap:wrap}\n#bestpcbs-trace-inductance-1357 legend{font-size:14px;font-weight:bold;margin-bottom:8px;padding:0}\n#bestpcbs-trace-inductance-1357 .trace-models label{display:flex;align-items:center;gap:6px;font-weight:600}\n#bestpcbs-trace-inductance-1357 .trace-models input{width:16px;height:16px;margin:0;accent-color:#176a79}\n#bestpcbs-trace-inductance-1357 .trace-inputs{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}\n#bestpcbs-trace-inductance-1357 .trace-inputs label{display:flex;flex-wrap:wrap;align-content:flex-end;font-size:13px;font-weight:600;min-width:0}\n#bestpcbs-trace-inductance-1357 .trace-inputs label>span{white-space:pre}\n#bestpcbs-trace-inductance-1357 .trace-inputs input,#bestpcbs-trace-inductance-1357 .trace-inputs select{display:block;width:100%;height:42px;margin:6px 0 0;padding:7px 10px;border:1px solid #879aa4;border-radius:3px;background:#fff;color:#17262d;font:16px Arial,Helvetica,sans-serif;min-width:0}\n#bestpcbs-trace-inductance-1357 input:focus,#bestpcbs-trace-inductance-1357 select:focus{outline:2px solid #176a79;outline-offset:2px}\n#bestpcbs-trace-inductance-1357 .trace-actions{display:flex;gap:10px;margin:18px 0 8px}\n#bestpcbs-trace-inductance-1357 button{border:1px solid #176a79;border-radius:3px;padding:9px 18px;font-size:15px;font-weight:bold;line-height:1.4;cursor:pointer;background:#176a79;color:#fff}\n#bestpcbs-trace-inductance-1357 button[type=reset]{background:#fff;color:#174955}\n#bestpcbs-trace-inductance-1357 .trace-main-result{border-top:1px solid #bccbd2;padding:18px 0 12px;display:flex;justify-content:space-between;align-items:center;gap:10px;flex-wrap:wrap}\n#bestpcbs-trace-inductance-1357 .trace-main-result strong{font-size:28px;color:#0e5968;white-space:nowrap}\n#bestpcbs-trace-inductance-1357 .trace-results{margin:0;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:0 20px}\n#bestpcbs-trace-inductance-1357 .trace-results>div{padding:10px 0;border-bottom:1px solid #d9e0e4;min-width:0}\n#bestpcbs-trace-inductance-1357 dt{font-size:12px;color:#4b5e69;font-weight:normal}\n#bestpcbs-trace-inductance-1357 dd{margin:3px 0 0;font-size:17px;font-weight:bold;overflow-wrap:anywhere}\n#bestpcbs-trace-inductance-1357 .trace-note{font-size:12px;text-align:left;line-height:1.55;margin:12px 0 0}\n#bestpcbs-trace-inductance-1357 .trace-error{font-size:14px;text-align:left;color:#a12b22;margin:10px 0}\n@media(max-width:740px){#bestpcbs-trace-inductance-1357 .trace-inputs{grid-template-columns:repeat(2,minmax(0,1fr))}}\n@media(max-width:420px){#bestpcbs-trace-inductance-1357{padding:14px}#bestpcbs-trace-inductance-1357 .trace-inputs,#bestpcbs-trace-inductance-1357 .trace-results{grid-template-columns:minmax(0,1fr)}#bestpcbs-trace-inductance-1357 .trace-main-result strong{font-size:25px}}\n<\/style>\n<div id=\"bestpcbs-trace-inductance-1357\" class=\"trace-calculator\">\n<form aria-label=\"PCB trace inductance calculator\" novalidate>\n<fieldset class=\"trace-models\">\n<legend>Model<\/legend>\n<p><label><input type=\"radio\" name=\"mode\" value=\"straight\" checked> Straight copper strip<\/label><label><input type=\"radio\" name=\"mode\" value=\"line\"> Known transmission line<\/label><\/fieldset>\n<div class=\"trace-inputs\"><label>Length units<select name=\"unit\" aria-label=\"Length units\"><option value=\"mm\">mm<\/option><option value=\"mil\">mil<\/option><option value=\"inch\">inches<\/option><\/select><\/label><label>Trace length (<span data-length-unit>mm<\/span>)<input name=\"length\" aria-label=\"Trace length\" type=\"number\" min=\"0\" step=\"any\" value=\"10\" inputmode=\"decimal\"><\/label><label data-model=\"straight\">Trace width (<span data-length-unit>mm<\/span>)<input name=\"width\" aria-label=\"Trace width\" type=\"number\" min=\"0\" step=\"any\" value=\"0.25\" inputmode=\"decimal\"><\/label><label data-model=\"straight\">Copper thickness<input name=\"thickness\" aria-label=\"Copper thickness\" type=\"number\" min=\"0\" step=\"any\" value=\"35\" inputmode=\"decimal\"><\/label><label data-model=\"straight\">Thickness units<select name=\"thicknessUnit\" aria-label=\"Thickness units\"><option value=\"um\">micrometers<\/option><option value=\"mil\">mil<\/option><\/select><\/label><label data-model=\"line\" hidden>Characteristic impedance (ohm)<input name=\"impedance\" aria-label=\"Characteristic impedance\" type=\"number\" min=\"0\" step=\"any\" value=\"50\" inputmode=\"decimal\"><\/label><label data-model=\"line\" hidden>Effective relative permittivity<input name=\"effectiveEr\" aria-label=\"Effective relative permittivity\" type=\"number\" min=\"1\" step=\"any\" value=\"3.2\" inputmode=\"decimal\"><\/label><label>Frequency (MHz)<input name=\"frequency\" aria-label=\"Frequency\" type=\"number\" min=\"0\" step=\"any\" value=\"100\" inputmode=\"decimal\"><\/label><label>Current change (A)<input name=\"currentStep\" aria-label=\"Current change\" type=\"number\" min=\"0\" step=\"any\" value=\"1\" inputmode=\"decimal\"><\/label><label>Rise time (ns)<input name=\"riseTime\" aria-label=\"Rise time\" type=\"number\" min=\"0\" step=\"any\" value=\"1\" inputmode=\"decimal\"><\/label><\/div>\n<div class=\"trace-actions\"><button type=\"submit\">Calculate<\/button><button type=\"reset\">Reset<\/button><\/div>\n<p data-error role=\"alert\" class=\"trace-error\">\n<div data-results aria-live=\"polite\">\n<div class=\"trace-main-result\"><span data-result-label>Partial self-inductance<\/span><strong data-inductance>9.515 nH<\/strong><\/div>\n<dl class=\"trace-results\">\n<div>\n<dt>Inductance per length<\/dt>\n<dd data-density>0.9515 nH\/mm<\/dd>\n<\/div>\n<div>\n<dt>Inductive reactance<\/dt>\n<dd data-reactance>5.978 ohm<\/dd>\n<\/div>\n<div>\n<dt>L x dI\/dt estimate<\/dt>\n<dd data-voltage>9.515 V<\/dd>\n<\/div>\n<div>\n<dt>One-way line delay<\/dt>\n<dd data-delay>Not modeled<\/dd>\n<\/div>\n<div>\n<dt>Equivalent line capacitance<\/dt>\n<dd data-capacitance>Not modeled<\/dd>\n<\/div>\n<\/dl>\n<p data-scope class=\"trace-note\">\n<p data-distributed class=\"trace-note\">\n<\/div>\n<p><noscript><\/p>\n<p>JavaScript is required for interactive results. The formula and worked examples remain available below.<\/p>\n<p><\/noscript><\/form>\n<\/div>\n<p><script>(function (global) { 'use strict'; const c = 299792458; const factors = { mm: 1, mil: 0.0254, inch: 25.4, um: 0.001 }; function positive(value, name, zeroAllowed) { if (!Number.isFinite(value) || (zeroAllowed ? value < 0 : value <= 0)) { throw new Error(name + ' must be ' + (zeroAllowed ? 'zero or greater.' : 'greater than zero.')); } return value; } function calculate(input) { const length = positive(input.length, 'Trace length'); let nH, delayNs = null, capacitancePf = null; if (input.mode === 'straight') { const width = positive(input.width, 'Trace width'); const thickness = positive(input.thickness, 'Copper thickness'); if (length < 10 * (width + thickness)) { throw new Error('For this straight-strip approximation, use a length at least 10 times (width + thickness), or use a field solver.'); } nH = 0.2 * length * (Math.log(2 * length \/ (width + thickness)) + 0.2235 * (width + thickness) \/ length + 0.5); } else if (input.mode === 'line') { const impedance = positive(input.impedance, 'Characteristic impedance'); const effectiveEr = positive(input.effectiveEr, 'Effective relative permittivity'); if (effectiveEr < 1) throw new Error('Effective relative permittivity must be at least 1.'); delayNs = length \/ 1000 * Math.sqrt(effectiveEr) \/ c * 1e9; nH = impedance * delayNs; capacitancePf = delayNs \/ impedance * 1000; } else { throw new Error('Choose a calculation model.'); } const frequency = positive(input.frequency, 'Frequency', true); const currentStep = positive(input.currentStep, 'Current change', true); const riseTime = positive(input.riseTime, 'Rise time'); return { nH, perMm: nH \/ length, reactance: 2 * Math.PI * frequency * 1e6 * nH * 1e-9, voltage: nH * currentStep \/ riseTime, delayNs, capacitancePf, distributed: delayNs === null ? false : delayNs \/ riseTime > 0.1 }; } const api = { calculate, factors }; if (typeof module === 'object' && module.exports) module.exports = api; global.BestPCBsTraceInductance1357 = api; if (typeof document === 'undefined') return;  function mount() { const root = document.getElementById('bestpcbs-trace-inductance-1357'); if (!root || root.dataset.mounted) return; root.dataset.mounted = 'true'; const form = root.querySelector('form'); const byName = name => form.elements.namedItem(name); const output = root.querySelector('[data-results]'); const error = root.querySelector('[data-error]'); let lastUnit = byName('unit').value; let lastThicknessUnit = byName('thicknessUnit').value; function number(name) { const field = byName(name); if (field.value.trim() === '') throw new Error(field.labels[0].textContent.trim() + ' is required.'); return Number(field.value); } function render() { const mode = byName('mode').value; root.querySelectorAll('[data-model]').forEach(group => { group.hidden = group.dataset.model !== mode; }); root.querySelectorAll('[data-length-unit]').forEach(label => { label.textContent = byName('unit').value === 'inch' ? 'in' : byName('unit').value; }); error.textContent = ''; try { const result = calculate({ mode, length: number('length') * factors[byName('unit').value], width: mode === 'straight' ? number('width') * factors[byName('unit').value] : 0, thickness: mode === 'straight' ? number('thickness') * factors[byName('thicknessUnit').value] : 0, impedance: mode === 'line' ? number('impedance') : 0, effectiveEr: mode === 'line' ? number('effectiveEr') : 0, frequency: number('frequency'), currentStep: number('currentStep'), riseTime: number('riseTime') }); root.querySelector('[data-result-label]').textContent = mode === 'straight' ? 'Partial self-inductance' : 'Equivalent line inductance'; root.querySelector('[data-inductance]').textContent = result.nH.toFixed(3) + ' nH'; root.querySelector('[data-density]').textContent = result.perMm.toFixed(4) + ' nH\/mm'; root.querySelector('[data-reactance]').textContent = result.reactance.toFixed(3) + ' ohm'; root.querySelector('[data-voltage]').textContent = result.voltage.toFixed(3) + ' V'; root.querySelector('[data-delay]').textContent = result.delayNs === null ? 'Not modeled' : result.delayNs.toFixed(4) + ' ns'; root.querySelector('[data-capacitance]').textContent = result.capacitancePf === null ? 'Not modeled' : result.capacitancePf.toFixed(3) + ' pF'; root.querySelector('[data-scope]').textContent = mode === 'straight' ? 'Isolated, uniform, long straight copper strip. Nearby return conductors, bends, vias, skin effect and coupling are excluded. The voltage estimate uses this partial inductance, not a complete power-loop model.' : 'Uniform low-loss line using supplied Z0 and effective permittivity. Width, copper thickness, dielectric height, solder mask and geometry must already be reflected in those inputs.'; root.querySelector('[data-distributed]').textContent = result.distributed ? 'Propagation delay exceeds 10% of rise time. Treat this as a screening flag: analyze the distributed line rather than interpreting L x dI\/dt as a predicted waveform.' : 'L x dI\/dt is an electrically-short estimate. It is not a prediction of measured overshoot.'; output.hidden = false; } catch (exception) { output.hidden = true; error.textContent = exception.message; } } form.addEventListener('submit', event => { event.preventDefault(); render(); }); form.addEventListener('input', render); form.addEventListener('change', event => { if (event.target.name === 'unit') { const ratio = factors[lastUnit] \/ factors[byName('unit').value]; ['length', 'width'].forEach(name => { const value = Number(byName(name).value); if (Number.isFinite(value)) byName(name).value = Number((value * ratio).toPrecision(10)); }); lastUnit = byName('unit').value; } if (event.target.name === 'thicknessUnit') { const value = Number(byName('thickness').value); if (Number.isFinite(value)) byName('thickness').value = Number((value * factors[lastThicknessUnit] \/ factors[byName('thicknessUnit').value]).toPrecision(10)); lastThicknessUnit = byName('thicknessUnit').value; } render(); }); form.addEventListener('reset', () => { setTimeout(() => { lastUnit = byName('unit').value; lastThicknessUnit = byName('thicknessUnit').value; render(); }, 0); }); render(); } if (document.readyState === 'loading') document.addEventListener('DOMContentLoaded', mount); else mount(); })(typeof globalThis !== 'undefined' ? globalThis : this); <\/script><\/p>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What_Is_PCB_Trace_Inductance\"><\/span>What Is PCB Trace Inductance?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>PCB trace inductance is the property that produces an induced voltage when current through a copper interconnect changes. Its calculated value depends on how the return conductor is represented: an isolated segment&#8217;s partial inductance is not the same quantity as the inductance of a complete current loop.<\/p>\n<p>The straight-strip mode is a <strong>PCB trace self inductance calculator<\/strong> for one uniform rectangular conductor. It estimates partial inductance with the return sufficiently distant that nearby conductors are not included in the model. Used as a <strong>PCB trace parasitic inductance calculator<\/strong>, it describes that segment&#8217;s contribution; a complete circuit also has a return conductor and magnetic coupling between paths.<\/p>\n<p>The known-transmission-line mode derives equivalent inductance and capacitance from the line&#8217;s supplied impedance and propagation velocity. It is useful when a stack-up calculation or extraction has already provided those parameters. It does not solve microstrip geometry, vias, bends, pads or a split reference plane.<\/p>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What_Inputs_Are_Needed_to_Calculate_PCB_Trace_Inductance\"><\/span>What Inputs Are Needed to Calculate PCB Trace Inductance?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Use the conductor&#8217;s routed length, finished trace width and finished copper thickness. Copper thickness <strong>t<\/strong> is different from dielectric height <strong>h<\/strong>, which is the spacing between the trace and its reference plane.<\/p>\n<figure class=\"wp-block-table\">\n<table class=\"has-fixed-layout\">\n<thead>\n<tr>\n<th>Input<\/th>\n<th>Use this value<\/th>\n<th>Common error<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Length l<\/td>\n<td>Length of the uniform straight conductor segment<\/td>\n<td>Using the board dimension or including a via without changing models<\/td>\n<\/tr>\n<tr>\n<td>Width w<\/td>\n<td>Finished copper width for that segment<\/td>\n<td>Using pad width for an otherwise narrow trace<\/td>\n<\/tr>\n<tr>\n<td>Copper thickness t<\/td>\n<td>Finished conductor thickness in micrometers or mil<\/td>\n<td>Entering the trace-to-plane spacing as copper thickness<\/td>\n<\/tr>\n<tr>\n<td>Effective relative permittivity<\/td>\n<td>Effective value for the selected transmission-line geometry<\/td>\n<td>Automatically substituting the laminate&#8217;s bulk Dk for a microstrip effective value<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/figure>\n<figure class=\"wp-block-image aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/10\/pcb-trace-inductance-calculator-dimensions.jpg\" width=\"600\" height=\"338\" alt=\"PCB trace geometry distinguishing length l, width w, copper thickness t and reference-plane spacing h\"><\/figure>\n<p>One mil is 0.0254 mm, one inch is 25.4 mm and 35 micrometers is 0.035 mm. Nominal 1 oz copper is commonly close to 35 micrometers, but outer-layer plating and the released fabrication stack-up determine the finished value.<\/p>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"How_Is_PCB_Trace_Inductance_Calculated\"><\/span>How Is PCB Trace Inductance Calculated?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>For a long, isolated rectangular strip, the approximation used here is:<\/p>\n<p><strong>L [nH] = 0.2l {ln[2l\/(w + t)] + 0.2235(w + t)\/l + 0.5}<\/strong><\/p>\n<p>All three dimensions are in millimeters and <strong>ln<\/strong> is the natural logarithm. The equivalent coefficient is 0.0002 when the result is expressed in microhenries. Mixing that coefficient with a nanohenry output creates a factor-of-1,000 error.<\/p>\n<p>When <strong>calculating PCB trace inductance<\/strong>, length has a stronger effect than the same proportional change in width or thickness. This implementation uses a conservative input limit of l at least 10 times (w + t) so that short, broad pads are not silently treated as long strips. That is a tool limit, not an IPC acceptance criterion. The approximation excludes nearby return conductors, skin effect and mutual coupling.<\/p>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"How_Much_Inductance_Does_a_10_mm_PCB_Trace_Have\"><\/span>How Much Inductance Does a 10 mm PCB Trace Have?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>A 10 mm trace with w = 0.25 mm and t = 0.035 mm gives 9.515 nH in straight-strip mode. At 100 MHz, its corresponding inductive reactance is 5.978 ohm. These are model results, not measurements from a fabricated board.<\/p>\n<figure class=\"wp-block-table\">\n<table class=\"has-fixed-layout\">\n<thead>\n<tr>\n<th>Length<\/th>\n<th>Width<\/th>\n<th>Copper thickness<\/th>\n<th>Partial inductance<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>5 mm<\/td>\n<td>0.25 mm<\/td>\n<td>35 micrometers<\/td>\n<td>4.071 nH<\/td>\n<\/tr>\n<tr>\n<td>10 mm<\/td>\n<td>0.25 mm<\/td>\n<td>35 micrometers<\/td>\n<td>9.515 nH<\/td>\n<\/tr>\n<tr>\n<td>20 mm<\/td>\n<td>0.25 mm<\/td>\n<td>35 micrometers<\/td>\n<td>21.789 nH<\/td>\n<\/tr>\n<tr>\n<td>10 mm<\/td>\n<td>0.50 mm<\/td>\n<td>35 micrometers<\/td>\n<td>8.266 nH<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/figure>\n<p>In this example, halving the length cuts the estimate by about 57%, while doubling the width cuts it by about 13%. Widening copper still helps current capacity and resistance, but it does not halve the inductance.<\/p>\n<figure class=\"wp-block-image aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/10\/pcb-trace-inductance-calculator-length.jpg\" width=\"600\" height=\"338\" alt=\"Calculated partial inductance versus length for a 0.25 mm wide and 35 micrometer thick straight copper trace\"><\/figure>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"How_Does_the_Return_Path_Affect_PCB_Trace_Inductance\"><\/span>How Does the Return Path Affect PCB Trace Inductance?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Current returns to its source. A close, continuous reference plane keeps the outgoing and returning paths near each other, reducing the area of the current loop. A plane split, connector transition or remote return can force current around a much larger path.<\/p>\n<p>A <strong>PCB trace loop inductance calculator<\/strong> must therefore account for both conductors and their coupling. The isolated-strip result cannot establish the loop inductance of a decoupling connection or switching-power hot loop. A <strong>parallel plate inductance calculator<\/strong> describes another geometry again; its assumptions cannot be applied to every narrow PCB trace.<\/p>\n<figure class=\"wp-block-image aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/10\/pcb-trace-inductance-calculator-return.jpg\" width=\"600\" height=\"338\" alt=\"Conceptual comparison of a close continuous return plane and a detoured return path around a reference-plane split\"><\/figure>\n<p>For multilayer <a href=\"https:\/\/www.bestpcbs.com\/products\/FR4-pcb.htm\">FR4 PCB<\/a> layouts, the trace-to-plane dielectric spacing is often more useful to review than overall board thickness. Two 1.6 mm boards can have very different signal-layer spacing and return geometry.<\/p>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"How_Do_You_Calculate_Inductance_for_a_PCB_Trace_over_a_Ground_Plane\"><\/span>How Do You Calculate Inductance for a PCB Trace over a Ground Plane?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>For a uniform, low-loss line, characteristic impedance and propagation delay relate directly to distributed inductance and capacitance:<\/p>\n<p><strong>Delay = l sqrt(effective relative permittivity) \/ c<br \/>L = Z0 x delay<br \/>C = delay \/ Z0<\/strong><\/p>\n<p>In these relations, l is in meters, c = 299,792,458 m\/s, delay is in seconds, Z0 is in ohms, L is in henries and C is in farads. The calculator performs the conversions to nH, pF and ns.<\/p>\n<p>For an assumed 50 ohm line, effective relative permittivity 3.2 and length 10 mm, the results are <strong>2.983 nH, 1.193 pF and 0.05967 ns<\/strong>. The comparison with the isolated-strip example demonstrates model sensitivity; it is not a claim that the example strip&#8217;s width automatically produces a 50 ohm line.<\/p>\n<p>A geometry-based <strong>microstrip inductance calculator<\/strong> also needs the trace-to-plane spacing and dielectric information. A <strong>stripline inductance calculator<\/strong> needs the appropriate buried-line geometry. In this tool, those effects must already be represented by the supplied Z0 and effective relative permittivity. The line option therefore works as a <strong>PCB trace inductance and capacitance calculator<\/strong> for known line parameters. Use a field solver when those parameters have not been established.<\/p>\n<p>A <strong>microstrip capacitance calculator<\/strong> uses the same conductor and dielectric structure. A <strong>PCB trace impedance formula<\/strong> based on the wrong cross-section also gives the wrong Z0 input; confirm whether the route is microstrip or stripline before using its result.<\/p>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"How_Do_You_Calculate_PCB_Trace_Inductive_Reactance\"><\/span>How Do You Calculate PCB Trace Inductive Reactance?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>The displayed reactance uses <strong>XL = 2pi fL<\/strong>. Setting frequency to zero produces zero inductive reactance in this idealized model; it does not remove copper resistance. Changing frequency does not recalculate skin effect or frequency-dependent material properties.<\/p>\n<p>For the 9.515 nH straight-strip example, the reactance is 0.598 ohm at 10 MHz and 5.978 ohm at 100 MHz. The frequency change alters reactance; it does not change the inductance returned by this geometry-only approximation.<\/p>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"How_Does_PCB_Trace_Inductance_Cause_Voltage_Spikes\"><\/span>How Does PCB Trace Inductance Cause Voltage Spikes?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>The transient estimate uses <strong>V = L x delta I \/ delta t<\/strong>. For 9.515 nH and a 1 A change in 1 ns, the lumped estimate is 9.515 V. With a 10 ns current transition, it falls to 0.9515 V. This explains why fast switching edges can make short connections important even when the switching repetition rate is modest.<\/p>\n<p>The complete switching loop includes packages, capacitors, vias and return paths. If one-way propagation delay is no longer small compared with the rise time, use distributed transmission-line analysis. The tool flags a delay exceeding 10% of rise time as a screening reminder, not as a universal compliance limit or a measured-overshoot prediction.<\/p>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"How_Can_You_Reduce_PCB_Trace_Inductance\"><\/span>How Can You Reduce PCB Trace Inductance?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Shorten the complete current path and keep its return close. Increasing copper width alone has diminishing benefit for the isolated-strip estimate.<\/p>\n<ul class=\"wp-block-list\">\n<li>Place high-frequency decoupling connections close to the supply and return terminals they serve.<\/li>\n<li>Keep critical routes over continuous reference copper and check how return current crosses a layer transition.<\/li>\n<li>Reduce unnecessary detours, long stubs and connector excursions before increasing copper area.<\/li>\n<li>Review the whole power loop, including component pads, package connections and vias.<\/li>\n<li>Use coupled extraction when adjacent conductors or multiple return paths determine the result.<\/li>\n<\/ul>\n<p>Where shorter interconnects require <a href=\"https:\/\/www.bestpcbs.com\/products\/HDI-board.htm\">HDI PCB<\/a> construction, we can review blind-via and microvia options with the proposed stack-up. HDI does not automatically guarantee lower inductance: the actual via geometry, return vias and layer arrangement still govern the connection.<\/p>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"How_Do_PCB_Trace_Tolerances_Affect_Inductance\"><\/span>How Do PCB Trace Tolerances Affect Inductance?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Finished trace width and copper thickness set the w and t inputs in the straight-strip formula. Etching and plating can change those dimensions from their nominal design values. In a ground-referenced transmission line, dielectric spacing and conductor geometry also affect Z0 and effective relative permittivity. Use the released stack-up and finished geometry rather than assuming that nominal copper weight or overall board thickness defines these inputs.<\/p>\n<p>At EBest Circuit (Best Technology), we can review the intended stack-up, finished conductor geometry and <a href=\"https:\/\/www.bestpcbs.com\/products\/impedance-control-pcb.htm\">impedance-controlled PCB<\/a> requirements before fabrication. We support standard FR4 line\/space down to 4\/4 mil and HDI options down to 2\/2 mil, subject to stack-up, materials, board dimensions and engineering review.<\/p>\n<p>For a calculation that will influence layout release, identify the signal layer and reference plane, dielectric spacing, material data, finished copper thickness, trace-width tolerance, route length and transitions. For controlled-impedance work, specify the target and acceptance method as well. An impedance coupon verifies a transmission-line requirement; it does not directly certify the inductance of every assembled current loop.<\/p>\n<p>A <strong>PCB trace current calculator<\/strong> or <strong>PCB trace resistance calculator<\/strong> answers a separate design question. Check current capacity, voltage drop and thermal behavior alongside inductance instead of expecting one trace-size result to establish all four.<\/p>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"PCB_Trace_Inductance_Calculator_FAQs\"><\/span>PCB Trace Inductance Calculator FAQs<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3>Why do two PCB inductance calculators give different answers?<\/h3>\n<p>A <strong>PCB inductance calculator<\/strong> may use different conductor geometry, return-path assumptions, units or copper-thickness conventions. Compare those inputs before comparing the output. A flat wire inductance calculator and a microstrip model do not describe the same field distribution.<\/p>\n<h3>Does this tool calculate via inductance or mutual inductance?<\/h3>\n<p>No. Use a geometry-specific <strong>via inductance calculator<\/strong> for a via estimate. A <strong>PCB trace mutual inductance calculator<\/strong> also needs relative conductor positions, separation, coupling and return paths; one trace&#8217;s length, width and thickness are insufficient.<\/p>\n<h3>Can I use this to design a spiral PCB inductor?<\/h3>\n<p>No. A <strong>PCB trace inductor calculator<\/strong> for a spiral needs turn count, inner and outer dimensions, spacing and winding shape. Adding straight-segment partial inductances does not include the mutual coupling between turns.<\/p>\n<p>Use the <a href=\"https:\/\/www.bestpcbs.com\/blog\/2026\/10\/pcb-trace-inductance-calculator\/\">PCB trace inductance calculator<\/a> with the model that matches the connection: isolated straight strip for a partial-inductance estimate, or known line parameters for equivalent transmission-line inductance and capacitance. Preserve the units and check the return path before treating the number as a circuit-level result.<\/p>\n<p>For fabrication review, send your PCB files, proposed stack-up, critical route information and impedance requirements to <a href=\"mailto:sales@bestpcbs.com\">sales@bestpcbs.com<\/a>. We can check the manufacturable trace geometry and stack-up inputs with you before production.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Use our PCB trace inductance calculator for straight traces and known transmission lines. Check nH, reactance and input limits before PCB fabrication.<\/p>\n","protected":false},"author":32826,"featured_media":37414,"comment_status":"open","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_uf_show_specific_survey":0,"_uf_disable_surveys":false,"footnotes":""},"categories":[37,5789],"tags":[8879,341,8878,8880],"class_list":["post-37418","post","type-post","status-publish","format-standard","hentry","category-faq","category-pcb-design","tag-pcb-calculator","tag-pcb-stackup","tag-pcb-trace-inductance","tag-return-path"],"acf":[],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Use our PCB trace inductance calculator for straight traces and known transmission lines. 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