Physics & Electrical calculator

Electrical Power Calculator

Select the circuit type and unknown value, then enter the remaining measurements and power factor where applicable.

Calculated privately on your device
No account. Formula and assumptions are shown below.

Calculator inputs

Electrical power details

Formula & disclaimer

DC Power = V × I; Single-phase AC Power = V × I × PF; Three-phase AC Power = √3 × V × I × PF

View assumptions

Formula reviewCalcs at Hand Editorial TeamVerified 31 August 2026 · automated checks included

Three useful checks, kept deliberately short.

What this result includes

Estimated active power is 1,840 W, or 1.84 kW.

A practical example

230 V single-phase AC, 10 A and 0.8 power factor: Use the single-phase factor · Multiply volts by amps · Apply the power factor.

Common input mistake

The balanced three-phase formula uses line-to-line voltage and line current.

DC Power = V × I; Single-phase AC Power = V × I × PF; Three-phase AC Power = √3 × V × I × PF

Power factor applies to AC active power and must be between 0 and 1.

Keep in mind: Confirm circuit configuration, voltage, phase balance and equipment ratings with a qualified electrician.

Produced byCalcs at Hand Editorial Team

Last formula check31 August 2026

Review methodKnown examples + boundary cases