kW / kVA to Amps

Convert kW or kVA to amps for single-phase or three-phase systems.

Inputs

Use 1.0 for resistive loads like heaters. Motors are often 0.8 to 0.9.

Results
Current
41.67 A
Current41.67 A
Real Power10.000 kW
Apparent Power10.000 kVA

How It Works

Single-phase:  I = (kVA x 1000) / V

Three-phase:  I = (kVA x 1000) / (1.732 x V)

If you enter kW, we convert to kVA first (kVA = kW / power factor). For heaters and incandescent loads, use power factor 1.

Example

15 kW at 0.9 PF: kVA = 15/0.9 = 16.67. Then I = 16667 / (1.732 x 480) = about 20 A.

Frequently Asked Questions

What voltage should I enter for three-phase?

Enter the line-to-line voltage (e.g., 208 V, 480 V). The √3 factor is already in the formula.

What's the difference between kW and kVA?

kW is real (useful) power. kVA is apparent power including reactive component. For resistive loads they are equal (PF=1).

These numbers are for reference only. We are not liable for any decisions you make or how you use these results in the real world. Check the current NEC and your local codes, and have a licensed electrician sign off before you install or buy. Full disclaimer