Amps To Watts Calculator
Convert electrical current (amps) to power (watts) using voltage and power factor. Supports DC, AC single phase, and AC three phase.
Published by:
isCalculator Editorial Team
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How to use this tool?
Follow these steps to calculate power in watts from current and voltage:
- Select current type – Choose DC, AC Single Phase, or AC Three Phase from the dropdown.
- Enter current – Input the current value in amperes (A) into the "Current (Amps)" field. Use positive numbers only.
- Enter voltage – Input the voltage value in volts (V) into the "Voltage (Volts)" field. Use positive numbers only.
- Enter power factor (if AC) – For AC types, provide a power factor between 0 and 1 (e.g., 0.9). This field is hidden for DC.
- Click "Calculate" – The result displays in watts (W) along with the formula used. For three-phase AC, the formula includes √3 (approximately 1.732).
Note: All inputs must be positive numbers. The calculator uses the standard electrical formulas: P = I × V for DC, P = I × V × PF for single-phase AC, and P = √3 × I × V × PF for three-phase AC.
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Frequently Asked Questions
For DC: Watts = Amps × Volts. For AC single phase: Watts = Amps × Volts × Power Factor. For AC three phase: Watts = √3 × Amps × Volts × Power Factor.
Power factor is the ratio of real power to apparent power in an AC circuit, ranging from 0 to 1. It indicates how effectively electrical power is used.
Yes, select 'DC' from the current type dropdown. Power factor is not needed for DC calculations.