Convert Watt (W) to Horsepower (mech) (hp) instantly. Enter any value and get the result immediately.
W → hp Converter
| Watt (W) | Horsepower (mech) (hp) |
|---|---|
| 0.1 W | 0.0001341 hp |
| 0.5 W | 0.00067051 hp |
| 1 W | 0.00134102 hp |
| 2 W | 0.00268204 hp |
| 5 W | 0.00670511 hp |
| 10 W | 0.01341022 hp |
| 20 W | 0.02682044 hp |
| 50 W | 0.06705109 hp |
| 100 W | 0.13410219 hp |
| 200 W | 0.26820437 hp |
| 500 W | 0.67051093 hp |
| 1000 W | 1.34102186 hp |
| 5000 W | 6.70510929 hp |
| 10000 W | 13.41021859 hp |
The formula to convert Watt (W) to mechanical Horsepower (hp) is:
Reverse formula — hp to W:
Step-by-step example — Convert 3,728.5 W to hp:
Common examples:
The watt (W) is the SI base unit of power — named after Scottish inventor James Watt. It represents one joule of energy per second. Every electrical device is rated in watts. Your electricity bill is in kilowatt-hours (kWh) — where 1 kWh = 1,000W for 1 hour. Electric motors for pumps, fans, and compressors are rated in watts — but their mechanical output capacity is often expressed in horsepower.
Mechanical horsepower (hp) was defined by James Watt in the 18th century as 33,000 foot-pounds of work per minute — based on observations of draft horses. One mechanical hp = 745.7 watts. In India, water pumps for agriculture are commonly rated in HP — 1 HP, 2 HP, 5 HP, 10 HP. Electric motors powering these pumps are rated in watts or kW.
Most practical use in India — converting motor wattage to HP for pumps:
| Pump Rating (HP) | Watts (W) | Kilowatt (kW) | Common Use |
|---|---|---|---|
| 0.5 HP | 372.85 W | 0.373 kW | Small domestic pump |
| 1 HP | 745.7 W | 0.746 kW | Home water pump |
| 2 HP | 1,491.4 W | 1.491 kW | Medium pump |
| 3 HP | 2,237.1 W | 2.237 kW | Small agri pump |
| 5 HP | 3,728.5 W | 3.729 kW | Standard agri pump |
| 7.5 HP | 5,592.75 W | 5.593 kW | Large agri pump |
| 10 HP | 7,457 W | 7.457 kW | Industrial pump |
| 15 HP | 11,185.5 W | 11.186 kW | Large industrial |
| Watts (W) | Horsepower (hp) |
|---|---|
| 100 W | 0.1341 hp |
| 250 W | 0.3353 hp |
| 500 W | 0.6705 hp |
| 745.7 W | 1.000 hp |
| 1,000 W | 1.341 hp |
| 2,000 W | 2.682 hp |
| 5,000 W | 6.705 hp |
| 10,000 W | 13.41 hp |
| 100,000 W | 134.10 hp |
| Type | Symbol | Watts | Use |
|---|---|---|---|
| Mechanical HP | hp | 745.7 W | Engines, US/UK |
| Metric HP | PS | 735.499 W | Cars, Europe/Asia |
| Electrical HP | ehp | 746 W | Electric motors |
Divide W by 745.7. Formula: hp = W ÷ 745.7. Example: 3,728.5 W ÷ 745.7 = 5 hp.
1 mechanical horsepower = 745.7 watts. This is the exact SI conversion defined from the original foot-pound definition by James Watt.
746 W = 1.0004 hp ≈ 1 hp. Note: electrical horsepower is defined as exactly 746 W — very close to mechanical hp (745.7 W).
1,000 W = 1.341 hp. Every kilowatt equals 1.341 mechanical horsepower — a useful reference for motor sizing.
500 W = 0.6705 hp. Formula: 500 ÷ 745.7 = 0.6705 hp. This is the power of a small water pump or compressor motor.
5 HP motor = 5 × 745.7 = 3,728.5 watts = 3.729 kW. This is a very common agriculture water pump size in India used for irrigation.