4 Outils Professionnels

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

pcb

Lancer

Trace Impedance Calculator

Microstrip and stripline baseline impedance

pcb

Lancer

Wire Size Calculator

AWG from current, length, and voltage drop

wire size calculator

Lancer

Voltage Drop Calculator

Cable voltage drop from AWG, current, and length

voltage drop

Lancer