Unit Converters

Power Converter

Engine, motor and air-conditioner ratings across units.

By TheCalcTools Updated Formula checked and tested

Your numbers

Your results

Watts
Watts
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Kilowatts
—
Megawatts
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Mechanical horsepower
—
Metric horsepower (PS)
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BTU per hour
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Power Converter by TheCalcTools

How the Power Converter works

Enter the power and choose its unit.

Mechanical (550 ft·lbf/s) and metric horsepower differ slightly, so both are shown.

Use BTU/h for heating and cooling equipment.

The formula

result = value × (factor of the ‘from’ unit ÷ factor of the ‘to’ unit)1 hp = 745.69987158 W, 1 PS = 735.49875 W, 1 BTU/h ≈ 0.29307107 W

Worked example

Using the default values shown in the calculator:

Value150
FromKilowatts
  1. 150 Kilowatts equals 150000.00 Watts ; 0.150000 Megawatts ; 201.1533 Mechanical horsepower.

Result:

Watts150000.00
Kilowatts150.0000
Megawatts0.150000
Mechanical horsepower201.1533
Metric horsepower (PS)203.9432
BTU per hour511821.25

Frequently asked questions

How many watts is one horsepower?

About 745.7 W for mechanical horsepower and 735.5 W for metric horsepower.

How many BTU/h in a kilowatt?

About 3,412 BTU per hour.

Sources and further reading

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This calculator gives estimates for information only. Check important results independently before you rely on them. See our disclaimer.