kVA to kW Calculator
Enter apparent power (kVA) and power factor to calculate real power (kW).
How to convert kVA to kW
Converting kVA (kilovolt-amperes) to kW (kilowatts) is a common task when sizing generators, transformers, UPS systems, and industrial electrical loads. The conversion depends on one key value: power factor (PF).
kW = kVA × Power Factor
Example: If your equipment is rated at 100 kVA and operates at a power factor of 0.8,
then real power is:
100 × 0.8 = 80 kW.
What do kVA and kW mean?
kVA (Apparent Power)
kVA is the total power supplied in an AC system. It includes both:
- Useful working power (real power), and
- Reactive power needed to energize magnetic and electric fields.
kW (Real Power)
kW is the portion of power that actually performs useful work, such as running motors, lighting, heaters, compressors, and production equipment.
Power Factor (PF)
Power factor is the ratio of real power to apparent power. It ranges from 0 to 1 (or 0% to 100%). A higher power factor means more of your apparent power is converted into useful work.
Typical power factors by load type
| Load Type | Typical PF | Notes |
|---|---|---|
| Resistive heaters / incandescent lighting | 0.95 - 1.00 | Mostly real power |
| Small motors | 0.70 - 0.85 | Varies with load |
| Large industrial motors | 0.80 - 0.90 | Often corrected with capacitors |
| Data centers / UPS systems | 0.90 - 1.00 | Modern equipment often has high PF |
Why this conversion matters
- Generator sizing: Prevent under-sizing and unexpected shutdowns.
- Transformer planning: Match capacity to actual power demand.
- Billing and efficiency: Low PF can increase losses and utility penalties.
- System reliability: Better PF usually means better utilization of electrical infrastructure.
Quick examples
Example 1
50 kVA at PF 0.8 → 50 × 0.8 = 40 kW
Example 2
250 kVA at PF 0.9 → 250 × 0.9 = 225 kW
Example 3
500 kVA at PF 0.75 → 500 × 0.75 = 375 kW
Frequently asked questions
Can I convert kVA to kW without power factor?
No. You need power factor to determine real power accurately.
What if power factor is given as a percentage?
Use the same calculator. Entering 80 is treated as 80%, which equals 0.8.
Does phase (single-phase or three-phase) change this formula?
For total kVA to total kW conversion, the formula remains kW = kVA × PF. Phase details matter when you are calculating kVA from voltage and current.
Final note
This converter is ideal for quick planning, load checks, and engineering estimates. For critical installations, always verify values with equipment datasheets and licensed electrical professionals.