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Free Power Converter
Convert power units instantly — watts, kilowatts, megawatts, horsepower, BTU/hour, calories per second. Free, symmetrical, no sign-up.
Why symmetrical conversion?
How This Converter Works
Power measures energy transfer rate. Watts are used in electronics and electricity, horsepower in engines, BTU/h in HVAC. Our converter handles all 6 power units simultaneously.
Quick reference
Common Conversions
| Watts (W) | Horsepower (hp) | BTU/h | Context |
|---|---|---|---|
| 1 W | 0.00134 hp | 3.41 BTU/h | One watt — LED light bulb |
| 60 W | 0.0805 hp | 205 BTU/h | Traditional incandescent bulb |
| 745.7 W | 1.0 hp | 2,545 BTU/h | One horsepower |
| 1,000 W | 1.341 hp | 3,412 BTU/h | One kilowatt — hair dryer |
| 150,000 W | 201 hp | 511,800 BTU/h | Average car engine |
FAQ
Frequently Asked Questions
1How many watts is one horsepower?
One mechanical horsepower equals 745.7 watts. Electric horsepower is slightly different at 746 watts. Metric horsepower (PS) equals 735.5 watts.
2What is the difference between watts and watt-hours?
Watts measure power (rate of energy use), while watt-hours measure energy (total amount). A 100W bulb running for 10 hours uses 1,000 Wh = 1 kWh of energy.
3What does BTU/h mean in HVAC?
BTU per hour (BTU/h) measures heating or cooling capacity. A 12,000 BTU/h unit is '1 ton' of cooling — roughly enough for a 550 sq ft (51 m²) room.
4How do I convert kW to horsepower?
Multiply kW by 1.341. So a 150 kW car engine = 201 hp. To go from hp to kW, multiply by 0.7457.
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