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Wattage to Amperage Calculator — result sheet
Estimate electrical current from real power, voltage, and power factor for a single-phase or balanced three-phase model.
Inputs used
Results
Visual chart
Breakdown
Calculation steps
Returned data table
Formula and methodology
Formula: Single-phase current I = P ÷ (V × power factor). Balanced three-phase line current I = P ÷ (√3 × V × power factor), with power factor entered as a decimal.
The calculator solves a real-power relationship and shows the selected phase convention. It does not identify conductor size, breaker rating, voltage drop, harmonics, inrush current, or installation compliance.
This result follows the calculator's declared inputs, precision, validation boundaries, and model limits.
Input contract
- Real power — W; minimum 0; maximum 1000000000000
- RMS voltage — V; minimum 1.0E-6; maximum 1000000000
- Power factor — %; minimum 1.0E-6; maximum 100
- Supply model — 2 choices
Worked example
| Input | Value |
|---|---|
| Real power | 1000 |
| RMS voltage | 230 |
| Power factor | 100 |
| Supply model | single |
A 1,000 W, 230 V, unity-power-factor single-phase load draws about 4.3478 A.
Assumptions and limits
- Power is real input power in watts, not apparent power in volt-amperes.
- Voltage is RMS line voltage for the selected supply model.
- Power factor is entered as a percentage and converted to a decimal in the formula.
- The three-phase option assumes a balanced system and uses √3.
- The single-phase option uses I = P/(V×PF).
- The voltage and power factor are positive so the current remains defined.
- DC or unity-power-factor loads can use a power factor of 100% as a simplified case.
- Starting current, harmonics, phase imbalance, efficiency, and reactive power are not inferred.
- The answer is a calculation aid, not permission to select wiring or protection equipment.
- Electrical work must follow local codes and be checked by a qualified professional.
Calculator note
Source and methodology
Use the official WorldCalculate methodology policy for the source, formula, precision, and boundary standards behind this calculator.
Planning estimate, not financial, medical, legal, or professional advice. © WorldCalculate — reuse with attribution. Built and curated by Hassan ALRowaie.
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