Professional reference for the building trades · tradeconvert.pro · NEC 2026 Compliant

Electrical Calculator — Watts to Amps & Wire Gauge Guide

Calculate electrical loads, determine circuit breaker requirements, and reference AWG wire sizes. All values based on NEC 2026 standards.

To calculate Amps from Watts: divide Watts by Volts (I = P / V). For example, a 2400W load on 240V draws 10A. NEC requires a 125% safety factor for continuous loads, meaning a 10A continuous load requires a 15A breaker (the 80% rule).

Watts to Amps Calculator

Single Phase · AC/DC

Watts (Power)

Voltage

20.00 Amps

2400W ÷ 120V = 20.00A

Ohm's Law (P = I × V)

I = P ÷ V → 2400 ÷ 120 = 20.00A

AWG Wire Gauge & Ampacity Reference

Simplified ampacity chart for copper wire (NEC Table 310.16).
AWG	mm²	Ampacity 60°C	75°C	Common Use
14 AWG	2.08	15A	20A	Lighting, 15A circuits
12 AWG	3.31	20A	25A	Outlets, 20A circuits
10 AWG	5.26	30A	35A	Dryers, A/C
8 AWG	8.37	40A	50A	Ranges, EV Chargers
6 AWG	13.3	55A	65A	Subpanels