PCB Trace Width Calculator

Calculate the minimum trace width for a given current using IPC-2221 guidelines. Also shows trace resistance and voltage drop.

Current (A)

Copper Thickness (oz)

Temperature Rise (°C)

Layer

Trace Length (inches) — for resistance/voltage drop

Required Trace Width

mils

Trace Width (mm)

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Cross-Section Area

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Trace Resistance

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Voltage Drop

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IPC-2221 Trace Width Formula

Area (mils²) = (I / (k × ΔT^b))^(1/c)

External: k=0.048, b=0.44, c=0.725

Internal: k=0.024, b=0.44, c=0.725

Width (mils) = Area / (Thickness × 1.378)