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Power Converter

Convert power between watts, kilowatts, megawatts, horsepower, BTU per hour, and kilocalories per hour. Type in any field to update all others instantly.

Converter Tools Runs locally No data sent
wattskWhorsepowerBTU/hbrowser only
Power
Watts
W
Kilowatts
kW
Megawatts
MW
Horsepower
hp
BTU / hour
BTU/h
kcal / hour
kcal/h
Quick examples
Power reference
ReferenceWkWhp
LED light bulb100.010.013
Microwave oven100011.34
Electric car motor (typical)150000150201
Average US home12001.21.61
1 horsepower745.70.74571

What is a Power Converter?

A power converter translates the rate of energy transfer between different unit systems. The watt (W) is the SI unit of power: 1 W = 1 joule per second. Kilowatts (kW) and megawatts (MW) are multiples. Horsepower (hp) is used in automotive and mechanical contexts. BTU/h is used in HVAC systems. Kilocalories per hour is used for human metabolic rate.

How to Use Power Converter

  1. Type a power value into any field (W, kW, MW, hp, BTU/h, or kcal/h).
  2. All other fields update instantly.
  3. Use quick example buttons for common reference power values.
  4. Click Clear to reset all fields.

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Power Units Explained ▾
Example
Input 1 horsepower
Output 745.7 W / 0.7457 kW / 2544.4 BTU/h
Common Use Cases
  • Comparing car engine power ratings
  • HVAC: converting AC capacity between BTU/h and kW
  • Electrical: understanding appliance watt ratings
  • Engineering: motor and pump power conversion
Frequently Asked Questions
How many watts is 1 horsepower?

1 mechanical horsepower = 745.7 watts.

How many BTU/h is 1 kW?

1 kW = 3412.14 BTU/h.

What is the difference between power and energy?

Power is the rate of energy transfer (watts = joules per second). Energy is the total amount transferred over time (kWh = kW multiplied by hours).

What is horsepower used for?

Horsepower is used to rate engines, motors, and tools —especially in the US and UK. Car engine output, air conditioner capacity, and vacuum cleaners are often rated in horsepower or BTU/h.