Electrical Calculator
Power Calculator
Calculate electrical power using voltage, current, and power factor.
What this calculator does
This calculator estimates electrical power from voltage, current, and power factor using a simple single-phase power formula.
It is useful for quick checks involving electrical loads, small equipment, general power estimation, and rough consumption analysis.
Inputs
Result
How to read the result
The watt result shows estimated power in watts, while the kilowatt result shows the same value converted to kW for easier comparison with larger loads or electricity cost estimates.
This is best used as a simple reference value, especially when you want a quick estimate rather than a full engineering analysis.
Formula
Power (W) = Voltage (V) × Current (A) × Power Factor
Power (kW) = Power (W) ÷ 1000
Example
If voltage is 220V, current is 10A, and power factor is 0.9:
220 × 10 × 0.9 = 1980 W
1980 W ÷ 1000 = 1.98 kW
Important notes
This is a simple single-phase estimate
This page is intended for a basic single-phase style power estimate. For balanced three-phase systems, use the dedicated 3 Phase Power Calculator.
Power factor affects real power
If power factor is lower than 1, real usable power is lower than the simple voltage × current product.
This is not a full load study
Use this calculator for quick estimation, not for final protection design, wiring decisions, or compliance review.
FAQ
What is power factor?
Power factor represents how efficiently electrical power is being used. A value of 1 means ideal efficiency.
Can I leave power factor as 1?
Yes. For a quick estimate, using 1 is acceptable if you do not have a measured power factor value.
Is this for single-phase power?
Yes. This calculator is intended for a basic single-phase power estimate.
Why can the actual measured value differ?
Real systems may differ because of varying load behavior, power factor, harmonics, measurement conditions, and equipment characteristics.