Estimate amperage load from watts, voltage, phase type, power factor, and multiple electrical loads. This calculator also estimates adjusted continuous load, breaker size, fuse size, remaining capacity, and load percentage.
Load amps:
The calculator converts watts or volt-amps into current based on voltage, phase type, and power factor.
Adjusted amps:
Continuous load and optional safety factors are applied to estimate planning amperage.
Circuit comparison:
The result is compared to the selected circuit rating to estimate load percentage and remaining amps.
An amperage load calculator helps estimate how many amps a device, circuit, appliance, or group of loads may draw.
It can help with breaker planning, fuse planning, wire sizing, circuit load checks, appliance loads, lighting loads, EV chargers, heaters, motors, DC circuits, and general electrical planning.
Your result shows load amps, adjusted amps, total watts, volt-amps, recommended breaker size, recommended fuse size, estimated wire size, circuit load percentage, remaining amps, and multiple load row totals.
For a basic single-phase load, divide watts by volts. If power factor is used, divide watts by volts times power factor.
At 120 volts and a power factor of 1.0, 2,400 watts is 20 amps.
Adjusted amperage includes planning factors such as continuous load or extra safety margin. It is useful when comparing a load to a breaker, fuse, or wire size.
No. This is a simplified planning calculator. Final circuit sizing depends on conductor size, insulation rating, breaker or fuse size, equipment nameplate ratings, derating, and local electrical code.