4 Professionelle Werkzeuge

PCB & Wiring Calculators — Trace Width, AWG & Voltage Drop

Free PCB trace width, microstrip impedance, wire size (AWG from amps), and cable voltage drop calculators. IPC-2221 and NEC-style ampacity.

Quick Answer

15 A copper branch: 14 AWG minimum. 20 A: 12 AWG. Long runs upsize so voltage drop stays under 3% (VD = 2 × I × R). Board traces use IPC-2221, not AWG.

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Wire Size Calculator

AWG from current, length, and 3% drop

Voltage Drop Calculator

Known AWG → volts and percent drop

AWG Wire Size Chart

Gauge to mm, mm², and circular mils

PCB Trace Width

IPC-2221 width for a target current

PCB Trace Width Calculator

IPC-style baseline current sizing

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Trace Impedance Calculator

Microstrip and stripline baseline impedance

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Wire Size Calculator

AWG from current, length, and voltage drop

wire size calculator

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Voltage Drop Calculator

Cable voltage drop from AWG, current, and length

voltage drop

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