Convert power between watts, kilowatts, megawatts and mechanical horsepower.
Calculations happen locally. We do not send your values to our server.
1 hp is about 0.74569987 kW, so a 150 hp engine is about 111.85498074 kW and a 100 kW electric motor is about 134.10220896 hp. A 1,500 W kettle draws about 2.01153313 hp while it runs.
Power is energy per unit of time, and one watt is one joule per second. Every value is normalised to watts before conversion: a kilowatt is 1,000 W and a megawatt is 1,000 kW, the scale used for power stations and large wind turbines.
The horsepower here is mechanical horsepower, about 745.7 W. Metric horsepower, written PS, CV or ch, is slightly smaller at about 735.5 W and is not included, so a car advertised as 150 PS has a little less power than one rated 150 hp.
Power is energy per unit of time, and one watt is one joule per second. A kilowatt is 1,000 W and a megawatt is 1,000 kW, which is how power stations and large wind turbines are rated. Power is not the same as energy: a 1,500 W heater draws 1.5 kW while it runs, and after 2 hours it has used 3 kWh of energy. Use the Energy Converter for kWh, joules and calories, and the Electricity Cost Calculator for running costs.
The horsepower in this converter is mechanical horsepower, about 745.7 W. One hp is about 0.74569987 kW, so a 150 hp engine is about 111.85498074 kW and a 100 kW electric motor is about 134.10220896 hp. Many countries now list vehicle power in kilowatts first. Metric horsepower, written PS, CV or ch, is slightly smaller at about 735.5 W and is not included here, so a car advertised as 150 PS has a little less power than one rated 150 hp.
A 1,500 W kettle, heater or hair dryer uses about 2.01153313 hp while running, more than many garden machines. Motor labels may show both input power drawn from the supply and output power delivered at the shaft; output is lower because of losses, so compare like with like. Air conditioners are also rated in BTU per hour in some markets; 12,000 BTU/h, sometimes called one ton of cooling, is about 3.5 kW of cooling capacity, not the electrical power the unit consumes.
| Input | Result |
|---|---|
1 hp → kW | 0.74569987 |
150 hp → kW | 111.85498074 |
100 kW → hp | 134.10220896 |
1500 W → hp | 2.01153313 |
1 MW → kW | 1,000 |
Power against energy. A 1,500 W heater draws 1.5 kW while it runs, and after 2 hours it has used 3 kWh of energy. Use the Energy Converter for kWh, joules and calories, and the Electricity Cost Calculator to turn a wattage and a runtime into money.
Because the unit differs. Many countries now list vehicle power in kilowatts first, while others quote horsepower, and metric horsepower is a third figure again. Converting with this tool puts them on the same scale: 150 hp is about 111.85498074 kW, and 100 kW is about 134.10220896 hp.
Either, and it matters. Input power is what the motor draws from the supply; output power is what it delivers at the shaft, and it is lower because of losses, so compare like with like. Air conditioners add another unit: 12,000 BTU/h, sometimes called one ton of cooling, is about 3.5 kW of cooling capacity, not the electricity the unit consumes.