AWG Wire Size Chart & Calculator | Free Voltage Drop Tool
AWG Wire Size Chart & Calculator
Interactive wire gauge reference with ampacity ratings, diameter, resistance, and voltage drop calculations. Updated for NEC 2023.
AWG quick reference chart
Copper conductor specifications at 75°C per NEC Table 310.16.
| AWG | Dia (in) | Dia (mm) | kcmil | Ohm/kft | 60C | 75C | 90C | Common uses |
|---|
Voltage drop calculator
NEC recommends 3% max for branch circuits, 5% total.
What size wire do I need?
Understanding AWG wire sizes
American Wire Gauge (AWG) is the standard system for measuring wire diameter in the US and Canada. The gauge number is inversely related to diameter. For every 6-gauge decrease, diameter doubles and cross-sectional area quadruples. For every 3-gauge decrease, area doubles.
NEC ampacity ratings
NEC Table 310.16 provides ampacity at 60, 75, and 90 degrees C. Most installations use 75C terminations per NEC 110.14(C), so the 75C column is most commonly referenced.
Voltage drop
NEC recommends branch circuit voltage drop not exceed 3%, and total drop not exceed 5% per NEC 210.19(A) Informational Note No. 4.
Shop wire and terminations
Conversions Tech stocks bulk wire, compression lugs, terminals, and insulated taps for every AWG size. UL 486A/B listed, CSA certified. Request a quote for bulk pricing.
