15,000 Watts to Amps, How Many Amps Is 15,000 Watts?
15,000 Watts equals 125.00 amps at 120V or 62.50 amps at 240V. Common 15000W devices: Electric furnace, tankless water heater.
15,000 Watts Amps at Every Voltage
| Voltage | Single Phase | Three Phase |
|---|---|---|
| 120V | 125.00A | 72.17A |
| 208V | 72.12A | 41.64A |
| 240V | 62.50A | 36.09A |
| 277V | 54.15A | 31.27A |
| 480V | 31.25A | 18.04A |
The Formula
Single Phase: Amps = Watts ÷ Volts. For 15,000 Watts at 120V: 15000 ÷ 120 = 125.00A.
Three Phase: Amps = Watts ÷ (Volts × 1.732). For 15,000 Watts at 240V 3-phase: 15000 ÷ (240 × 1.732) = 36.09A.
With power factor: Amps = Watts ÷ (Volts × PF). A PF of 0.8 increases the current draw by 25%.
Wire and Breaker for 15,000 Watts at 120V
At 120V, 15,000 Watts draws 125.0A. Recommended: 4 AWG copper wire with a 70A breaker per NEC 310.16. For continuous loads (3+ hours), apply 125% rule. Use our Wire Size Calculator for exact sizing.
Common 15000W Devices
Electric furnace, tankless water heater. Always check the device nameplate for exact wattage, rated watts may differ from actual consumption.
Disclaimer: Calculations are for reference. Verify with device nameplate. Consult a licensed electrician for installations.