Watts To Amps Calculator
Convert electrical power (watts) to current (amps) using voltage and power factor. Supports DC, AC single-phase, and three-phase systems.
Published by:
isCalculator Editorial Team
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How to use this tool?
How to use the Watts to Amps Calculator:
- Enter Power (Watts): Input the total power consumption in watts (e.g., 1000).
- Enter Voltage (Volts): Input the system voltage (e.g., 120 for standard US outlet).
- Select Current Type: Choose DC, AC Single Phase, or AC Three Phase from the dropdown.
- Set Power Factor (if applicable): For AC types, enter a value between 0 and 1 (default is 1). For DC, this field is still shown but not used in calculation.
- For AC Three Phase only: Enter the Line-to-Line Voltage (e.g., 208 V) when the field appears.
- Click "Calculate Amps": The result shows the current in amperes (A) along with the formula used.
Note: All inputs must be positive numbers. Power factor must be between 0 and 1. The calculator uses standard electrical formulas: DC: I = P/V; AC Single Phase: I = P/(V×PF); AC Three Phase: I = P/(√3×VL-L×PF).
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Frequently Asked Questions
Use the formula: Amps = Watts / (Volts × Power Factor) for AC, or Amps = Watts / Volts for DC.
Power factor is a number between 0 and 1 representing the ratio of real power to apparent power in AC circuits. Typical values are 0.8 to 1.
Yes, select 'AC Three Phase' and enter line-to-line voltage and power factor.