Reactive Power Calculator
Calculate reactive power from voltage, current, and power factor (Q = V × I × sin(cos⁻¹(PF))).
Formula
Q = V × I × sin(cos⁻¹(PF))
- Q
- Reactive power, in volt-amps reactive
- V
- Voltage, in volts
- I
- Current, in amps
- PF
- Power factor, between 0 and 1
What this calculator does
Calculates reactive power — the non-working power component caused by inductive or capacitive loads.
Use cases
- Estimate the reactive power drawn by motors or transformers
- Size power factor correction capacitors for a known load
- Understand why a low power factor increases reactive power