100 Amps to kW
100 A is 23 kW at 230 V and 12 kW at 120 V (single-phase, power factor 1). Table for DC and three-phase, power factor 0.8, and the formula.
Formula
Worked example
- P = 230 × 100 × 1 / 1,000 = 23 kW
- With a power factor of 0.9: P = 230 × 100 × 0.9 / 1,000 = 20.7 kW
On other supplies
| Supply | Voltage | Power at pf 1 | Power at pf 0.8 |
|---|---|---|---|
| DC | 12 V | 1.2 kW | not used |
| DC | 24 V | 2.4 kW | not used |
| DC | 48 V | 4.8 kW | not used |
| Single-phase | 120 V | 12 kW | 9.6 kW |
| Single-phase | 230 V | 23 kW | 18.4 kW |
| Single-phase | 240 V | 24 kW | 19.2 kW |
| Three-phase | 208 V | 36.03 kW | 28.82 kW |
| Three-phase | 400 V | 69.28 kW | 55.43 kW |
| Three-phase | 415 V | 71.88 kW | 57.5 kW |
| Three-phase | 480 V | 83.14 kW | 66.51 kW |
Three-phase rows use the line-to-line voltage. DC ignores the power factor.
What 100 A looks like
100 A is about the size of an incoming supply for a small commercial unit.
This is an estimate of the load current only. Choosing a cable or a breaker also needs the installation method, the ambient temperature, the voltage drop and the rules you work to.
Frequently asked questions
How many kilowatts is 100 amps?
100 A is 23 kW on a 230 V single-phase supply and 12 kW on 120 V, both with a power factor of 1. The power depends on the voltage, so it is a different answer on every supply.
What if the power factor is not 1?
The real power falls. At 230 V and a power factor of 0.9, 100 A is 20.7 kW. Heaters and filament lamps are close to 1, while motors and many power supplies are lower.
What about a three-phase supply?
100 A on 400 V three-phase at a power factor of 0.8 is 55.43 kW. The line voltage is used with the factor √3 (about 1.732).
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