SI power units
- 1 watt (W) = 1 J/s
- 1 kilowatt (kW) = 1,000 W
- 1 megawatt (MW) = 1,000,000 W
- 1 gigawatt (GW) = 1,000,000,000 W
- 1 cal/s = 4.184 W
Power Reference Sheet
Conversions
Other common units
- 1 horsepower (hp) ≈ 745.6998716 W
- 1 BTU/h ≈ 0.2930710702 W
- 1 ft·lb/s ≈ 1.355817948 W
Other → SI
- 500 BTU/h ≈ 146.5355 W
- 2 hp ≈ 1,491.3997 W (≈ 1.49 kW)
- 10 ft·lb/s ≈ 13.55817948 W
SI → Other
- 750 W ≈ 1.006 hp
- 1 kW ≈ 3,412.141633 BTU/h
- 100 W ≈ 73.756 ft·lb/s
Quick benchmarks
- LED bulb: 9–12 W
- Home microwave: ~1 kW
- Electric dryer: 2–5 kW
- Compact EV (peak): 100–150 kW
Table: factors to watts (W)
| Unit | Symbol | Factor → W |
|---|---|---|
| Watts | W | 1 |
| Kilowatts | kW | 1,000 |
| Megawatts | MW | 1,000,000 |
| Gigawatts | GW | 1,000,000,000 |
| Horsepower (mechanical) | hp | 745.6998716 |
| BTU per hour | BTU/h | 0.2930710702 |
| Calories per second | cal/s | 4.184 |
| Foot-pounds per second | ft·lb/s | 1.355817948 |
This printable is a quick reference. For exact conversions (and copy-ready results), use the interactive converter.