Watts to Amps Calculator
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How do you convert watts to amps?
To convert watts to amps, divide watts by volts. For example, a 1500 W heater on a 120 V circuit draws 1500 ÷ 120 = 12.5 amps; on a 240 V circuit the same 1500 W draws 1500 ÷ 240 = 6.25 A. For AC circuits, also divide by the power factor: A = W ÷ (V × PF).
Watts to Amps Conversion Table (DC)
Watts to Amps Formula
Frequently Asked Questions
Divide the power in watts by the voltage in volts. For DC circuits: A = W ÷ V. For AC single-phase circuits, also divide by the power factor: A = W ÷ (V × PF). For AC three-phase: A = W ÷ (V × PF × 1.732).
DC: A = W ÷ V. AC Single-phase: A = W ÷ (V × PF). AC Three-phase: A = W ÷ (V × PF × 1.732). PF is the power factor — a value between 0 and 1 that accounts for reactive power in AC circuits. DC circuits always have a power factor of 1.
It depends on voltage and circuit type. 120V DC: 12.5 A. 240V DC: 6.25 A. 120V AC single-phase (PF 0.8): 15.625 A. 240V AC single-phase (PF 0.8): 7.8125 A.
Watts (W) measure electrical power — the rate at which energy is consumed or produced. Amps (A) measure electric current — the rate at which electric charge flows through a conductor. The two are linked by voltage: W = A × V. A device can draw few amps at high voltage or many amps at low voltage while consuming the same wattage.