Free Electrical Load Calculator
Calculate electrical load in watts and amps for circuit sizing and panel capacity planning.
W
%
Current Draw
12.5 A
With Safety Factor15.6 A
Recommended Breaker20 A
Current Draw vs Total Watts
Electrical Load Formula
Amps = Watts / Volts
NEC Safety Factor = 125% (for continuous loads)
Breaker sizes are standard: 15A, 20A, 30A, 40A, 50A. Always round up to the next standard size.
Example Calculation
1,500W load on a 120V circuit with 125% safety factor.
- 01Amps = 1,500W / 120V = 12.5A
- 02With safety = 12.5 × 1.25 = 15.6A
- 03Recommended breaker = 20A
Frequently Asked Questions
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