Watts to Amps Calculator
Convert electrical power in watts to current in amps.
Watts to Amps Formula
I = P/(V × PF) for this single-phase calculation.
How to Convert Watts to Amps
Current depends on power, voltage and, for AC loads, power factor. Dividing real power by voltage times power factor estimates the current for this single-phase calculation.
Example Calculation
A 1,200 W load at 230 V with a power factor of 0.9 draws 1,200/(230 × 0.9) ≈ 5.80 A.
Factors and Interpretation
Higher power increases current, while higher voltage lowers current for the same real power. A lower power factor increases current demand. For balanced three-phase systems, use the Three Phase Power Calculator because the relationship includes √3.
Frequently Asked Questions
Can I use power factor 1 for DC?
Yes. For a simple DC calculation, PF = 1 reduces the formula to I = P/V.
Why does lower power factor increase amps?
More current is required to deliver the same real power when a smaller fraction of apparent power becomes real power.
Is this a breaker-sizing tool?
No. It estimates current only. Breaker and conductor sizing require applicable electrical rules and installation conditions.
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Formula and Practical Limits
For DC, current can be estimated as I = P/V. In AC systems, real power conversion can also depend on phase, power factor and whether voltage/current values are RMS, so the correct formula depends on the electrical system.