Please enter all required values.
RESULTS
Input Parameters Specification
Trace WidthWidth of each coupled PCB trace. Trace width affects magnetic field spacing and coupled trace inductance behavior.
Trace SeparationDistance or spacing between the two edge coupled traces. The source formula uses this spacing directly inside the acosh term.
Trace LengthParallel coupled length of the PCB traces. This input is kept exactly because it is present in the original source calculator.
Relative PermeabilityMagnetic permeability ratio. Use 1 for normal PCB dielectric, FR4 area, air region, and most non-magnetic board materials.
Practical Operational Examples
PCB Coupled Traces
Estimate inductance between side-by-side traces in RF, pulse and high-speed PCB layouts.
Layout Optimization
Change spacing, width or length to see how edge coupling affects inductance.
Switching Loop Review
Check coupled conductor behavior in MOSFET gate routing, pulse lines, current sense paths and compact power PCB layouts.
RF Trace Comparison
Use the result as a quick estimate before deeper RF simulation or lab measurement for critical coupled trace structures.
Diagrams & Theory
Edge coupled trace inductance depends on trace width, trace separation, coupled length and relative permeability. When traces are closer, magnetic coupling changes the inductance behavior.
Formulas & Mathematical Logic
Formula used from source code: L = ((μ0 × μr) / π) × acosh(separation / width)
μ0 = 4 × π × 10^-7 H/m.
Width and separation are converted to meters using selected units.
Relative permeability μr is entered directly. For common PCB material and air region, μr is usually 1.
Note: The supplied source code reads trace length but does not multiply it into the final inductance formula, so this version preserves that original calculation behavior.
Practical meaning: separation-to-width ratio is the main driver in the preserved formula. Wider traces or smaller separation change the acosh term.
Step-by-Step Example
Example: trace width = 1 mm, trace separation = 3 mm, trace length = 50 mm, relative permeability = 1.
The calculator converts width and separation from millimeters to meters.
Relative permeability is multiplied with μ0 in the original source formula.
The acosh value is calculated from separation divided by trace width.
The final inductance value is displayed in henries.
Trace length remains a preserved source input, but the original formula does not use it in the final inductance expression.
How to Use This Calculator
Enter the width of each edge-coupled PCB trace.
Enter the separation between the two coupled traces.
Enter trace length exactly as required by the source calculator input set.
Enter relative permeability. Use 1 for ordinary PCB dielectric and air.
Click Calculate to get edge coupled trace inductance.
About This Calculator
Estimate inductive behavior between edge-coupled PCB traces.
The CalcBoy Edge Coupled Trace Inductance Calculator estimates coupled trace inductance from trace width, trace separation, trace length and relative permeability while preserving the original source formula.
When two PCB traces run side-by-side, their magnetic fields interact. This coupling can matter in RF routing, fast pulse circuits, switching regulators, gate-drive loops, current-sense lines and high-speed digital layouts. Even when the inductance is small, fast current changes can turn it into ringing, overshoot, EMI or unwanted coupling between nearby nets.
This calculator is useful for quick layout comparison. You can change trace width, spacing and material permeability to see how the preserved edge-coupled inductance expression responds. For ordinary PCB materials, relative permeability is normally close to 1, so most layout changes come from the trace geometry itself.
For critical RF, microwave or high-speed boards, treat this result as a first-pass estimate. Real behavior also depends on return path, plane distance, copper thickness, dielectric structure, surrounding copper, vias, loop area and frequency-dependent effects.
Best UseEdge-coupled PCB trace inductance estimates.
Supported InputsTrace width, trace separation, trace length and relative permeability.
Helpful ForRF traces, switching loops, pulse routing and high-speed PCB layouts.
Design ReminderKeep return paths tight to reduce real loop inductance.
Tip: In real PCB layouts, loop area and return current path often dominate inductive noise. Use short routing and nearby reference planes whenever possible.
Frequently Asked Questions
What is edge coupled trace inductance?
It is the inductive effect estimated between two side-by-side PCB traces based on their width, separation and magnetic permeability.
What relative permeability should I use for PCB material?
For normal PCB dielectric and air, use 1 unless you are working with a special magnetic material.
Does trace spacing affect inductance?
Yes. In the preserved formula, separation divided by width is used inside the acosh term, so spacing directly affects the result.
Why is trace length included?
The uploaded source includes trace length as an input. The original calculation reads it but does not multiply it into the final inductance formula, so this version preserves that behavior.
Can this replace electromagnetic simulation?
No. It is a quick calculator for estimation. Critical RF or high-speed designs should use simulation, measurement and stack-up review.
What unit is the output?
The result is displayed in henries.
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