kW and kVA
kW shows useful active power. kVA shows apparent power and includes the effect of power factor.
Electrical Power Calculator
Online calculation of current, kW and kVA for single-phase or three-phase systems from voltage and power factor.
All Calculators- Current
- 100.0 A
- kW
- 18.4 kW
- kVA
- 23.0 kVA
- Power Factor
- 0.8 PF
Power Factor
Power factor is the ratio between active and apparent power. Common preliminary estimates often use 0.8.
Single and Three Phase
Single-phase calculations use voltage and current directly; three-phase systems include the square root of 3 factor.
Simple example
For a 400 V three-phase load at 100 A and PF 0.8, the tool estimates about 69.3 kVA and 55.4 kW.
Use and limitation
Use this result for preliminary review of current, active power and apparent power. Final equipment selection should consider load type, starting current and site conditions.
Common questions
What does this electrical power calculator estimate?
It converts between current, kW and kVA using voltage, power factor and single-phase or three-phase system type.
When should I use kW versus kVA?
kW is active power used by the load. kVA is apparent power often used for equipment rating and supply sizing.
Is this enough for final cable or generator selection?
No. Use it for preliminary review, then verify load type, starting current, standards and site conditions.