21 Amps to Watts
21 amps is 2,520 watts at 120V (DC). The wattage depends on your circuit voltage.
21 Amps to Watts at Every Voltage
| Voltage | DC | AC (PF 0.85) | AC 3-Phase (PF 0.85) |
|---|---|---|---|
| 12V DC, automotive, solar |
252W | 214.2W | 371.01W |
| 24V DC, industrial control |
504W | 428.4W | 742.01W |
| 100V Japan residential |
2,100W | 1,785W | 3,091.71W |
| 120V US residential |
2,520W | 2,142W | 3,710.05W |
| 208V US commercial three-phase |
4,368W | 3,712.8W | 6,430.76W |
| 220V Legacy international / parts of Asia |
4,620W | 3,927W | 6,801.76W |
| 230V UK / EU residential |
4,830W | 4,105.5W | 7,110.93W |
| 240V US residential (dryer, range, HVAC) |
5,040W | 4,284W | 7,420.11W |
| 277V US commercial lighting |
5,817W | 4,944.45W | 8,564.04W |
| 400V UK / EU commercial three-phase |
8,400W | 7,140W | 12,366.84W |
| 460V US industrial motor (NEC 430.250 column) |
9,660W | 8,211W | 14,221.87W |
| 480V US industrial three-phase |
10,080W | 8,568W | 14,840.21W |
| 575V Canadian industrial three-phase |
12,075W | 10,263.75W | 17,777.34W |
Also Calculate
Other Amperages
1A120W at 120V
2A240W at 120V
3A360W at 120V
5A600W at 120V
7.5A900W at 120V
10A1,200W at 120V
12A1,440W at 120V
15A1,800W at 120V
20A2,400W at 120V
25A3,000W at 120V
30A3,600W at 120V
35A4,200W at 120V
40A4,800W at 120V
45A5,400W at 120V
50A6,000W at 120V
60A7,200W at 120V
70A8,400W at 120V
80A9,600W at 120V
100A12,000W at 120V
125A15,000W at 120V
150A18,000W at 120V
175A21,000W at 120V
200A24,000W at 120V
225A27,000W at 120V
250A30,000W at 120V
300A36,000W at 120V
350A42,000W at 120V
400A48,000W at 120V
500A60,000W at 120V
600A72,000W at 120V
This calculator provides estimates for reference purposes only. Always consult a licensed electrician and verify compliance with the National Electrical Code (NEC) and local electrical codes before performing any electrical work.