Conversion tool
Watts and Amps Calculator
Convert watts to amps or amps to watts from voltage, phase, and power factor; 1,440 W at 120 V equals 12 A.
Convert Watts and Amps
Convert current and real power for DC, single-phase AC, and balanced three-phase AC loads: 1,440 W at 120 V gives 12 A, and 15,000 W at 480 V 3-phase with 0.90 PF gives about 20.1 A.
Result
Amps
13.33 A
Result notes
Keep the entered values, assumptions, and result together when adding this calculation to job notes or submittal records. Final installation choices should align with the applicable code edition, equipment listing, manufacturer instructions, local amendments, and AHJ requirements.
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Related charts
Watts to Amps Chart
Use this watts to amps chart: 1,500W at 120V = 12.5A, 9 kW at 240V = 37.5A; compare 208V, 240V, 480V 3-phase and PF.
Amps to Watts Chart
Use this amps to watts chart: 12A at 120V = 1,440W; 24A at 480V 3-phase with 0.82 PF is about 16,360W.
Ohm's Law Formula Chart
Use V=IR and power formulas to solve voltage, current, resistance, and watts; 120 V across 24 ohms gives 5 A and 600 W.
Related guides
Electrical Power Formulas & Calculations Reference
Complete power formulas for DC, single-phase AC, and three-phase systems with power factor, kW/kVA/HP conversions, and worked examples.
Single-Phase and Three-Phase Power Fundamentals for U.S. AC and DC Systems
Use DC, single-phase AC, and balanced three-phase power relationships to review voltage, current, power factor, kW, kVA, and 60 Hz equipment behavior in U.S. systems.
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Formula and field context
Convert watts to amps or amps to watts from voltage, phase, and power factor; 1,440 W at 120 V equals 12 A.
Formula context
Watts to Amps Chart
Watts-to-amps is the load-planning direction: start with a watt rating and estimate current. 1,500 W at 120 V draws about 12.5 A, while the same wattage at 240 V draws about 6.3 A. For AC equipment with power factor below 1.0, current rises above the simple unity-PF result.
Formula
Single phase: A = W / (V x PF). Balanced three phase: A = W / (1.732 x VLL x PF).Variables to keep with the result
- A is current in amperes.
- W is real load power in watts.
- V is voltage for DC or single-phase calculations.
- VLL is line-to-line voltage for balanced three-phase calculations.
- PF is power factor when applicable.
Formula and variables
For DC and simple single-phase checks, current is watts divided by volts when the load is resistive. For balanced three-phase AC, current is watts divided by the square root of 3, line-to-line voltage, and power factor. Keep the voltage basis with the result: 120 V branch circuits, 240 V equipment, 208 V panels, 277 V lighting, and 480 V three-phase loads are not interchangeable.
U.S. field example
A 1,440 W load on a 120 V branch circuit draws 12 A when the power factor is 1. A 15,000 W balanced three-phase load at 480 V and 0.90 power factor draws about 20.1 A. Those are formula results for planning and nameplate review, not conductor or breaker approval.
When to use the full calculator
Use the full power calculator when you need apparent power, reactive power, multiple unknowns, or a complete AC power triangle. Move to the wire, breaker, voltage-drop, or motor calculators when the result will drive conductor sizing, overcurrent protection, voltage-drop review, or motor branch-circuit decisions.