PCB Parasitic Inductance Calculator | Pin, Trace, Via

📏 Unit System

Metric (mm) Imperial (inch)

All dimensions will use this unit.

🔧 Component / Structure

Pin / Lead (round wire) PCB Trace (rectangular) Through-hole Via

📌 Pin / Lead Dimensions

Length of the pin/lead

Wire diameter (for round pin)

📐 Formula: L (µH) = 0.0002 × L_mm × (ln(2L/D) - 0.75)

📐 PCB Trace Dimensions

Length of trace

Trace width

Copper thickness (e.g., 0.035mm for 1oz)

📐 Formula: L (µH) = 0.0002 × L_mm × [ ln(2L/(W+T)) + 0.5 + 0.2235×(W+T)/L ]

🔩 Via Parameters

Board thickness (via length)

Finished via hole diameter

📐 Formula: L (nH) = 0.0002 × h_mm × (ln(4h/D) + 1) × 1000

📖 Engineering reference: Parasitic inductance causes voltage spikes (L·di/dt) and signal reflections. Pin inductance is dominant in leaded components; trace inductance rises with length; via inductance depends on aspect ratio. Optimize by shortening current paths, widening traces, and using multiple parallel vias.

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🔌 PCB Parasitic Inductance Calculator