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20 amps to watts
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2,400 W
20 amps at 120 V · 4,800 W at 240 V
20 amps to watts by voltage
| Voltage | Watts | kW |
|---|---|---|
| 12 V DC | 240 W | 0.24 kW |
| 24 V DC | 480 W | 0.48 kW |
| 120 V | 2,400 W | 2.40 kW |
| 208 V | 4,160 W | 4.16 kW |
| 230 V | 4,600 W | 4.60 kW |
| 240 V | 4,800 W | 4.80 kW |
| 208 V three-phase (PF 0.9) | 6,485 W | 6.48 kW |
| 480 V three-phase (PF 0.9) | 14,964 W | 14.96 kW |
Single-phase: W = A × V (power factor 1). Three-phase: W = √3 × A × V × PF; motors and electronics have PF below 1.
FAQ
How many watts is 20 amps?
20 A × 120 V = 2,400 W; at 240 V it is 4,800 W. Watts = amps × volts for resistive single-phase loads.
What breaker do I need for a 20 amp load?
For a continuous load (3+ hours) the NEC sizes the breaker at 125%: 25 A → next standard size 25 A. Check local code.
Wire size for a 25 A circuit · Ohm’s law calculator · All amps to watts
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