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Power Converter

Instantly convert power between watts, kilowatts, megawatts, metric and mechanical horsepower, BTU and refrigeration units.

Use a comma or period as the decimal separator; do not use thousands separators.

All units

SI

Use as target unit: Picowatt
Picowatt (pW)
1e15
Use as target unit: Nanowatt
Nanowatt (nW)
1,000,000,000,000
Use as target unit: Microwatt
Microwatt (µW)
1,000,000,000
Use as target unit: Milliwatt
Milliwatt (mW)
1,000,000
Use as target unit: Watt
Watt (W)
1,000
Use as target unit: Kilowatt
Kilowatt (kW)
From
1
Use as target unit: Megawatt
Megawatt (MW)
0.001
Use as target unit: Gigawatt
Gigawatt (GW)
0.000001
Use as target unit: Terawatt
Terawatt (TW)
1e-9

Heat flow

Use as target unit: Thermochemical British Thermal Unit per Hour
Thermochemical British Thermal Unit per Hour (BTU(th)/h)
3,414.43
Use as target unit: British Thermal Unit (IT) per Hour
British Thermal Unit (IT) per Hour (BTU(IT)/h)
3,412.14
Use as target unit: Thermochemical Kilocalorie per Hour
Thermochemical Kilocalorie per Hour (kcal(th)/h)
860.421
Use as target unit: International Table Kilocalorie per Hour
International Table Kilocalorie per Hour (kcal(IT)/h)
859.845
Use as target unit: Thermochemical Calorie per Second
Thermochemical Calorie per Second (cal(th)/s)
239.006
Use as target unit: British Thermal Unit (IT) per Second
British Thermal Unit (IT) per Second (BTU(IT)/s)
0.947817

Horsepower

Use as target unit: Metric Horsepower
Metric Horsepower (PS)
1.35962
Use as target unit: Mechanical Horsepower
Mechanical Horsepower (hp(mech))
To
1.34102
Use as target unit: Electric Horsepower
Electric Horsepower (hp(elec))
1.34048
Use as target unit: Boiler Horsepower
Boiler Horsepower (hp(boiler))
0.101942

Mechanical rate

Use as target unit: Foot-pound Force per Minute
Foot-pound Force per Minute (ft·lbf/min)
44,253.7
Use as target unit: Foot-pound Force per Second
Foot-pound Force per Second (ft·lbf/s)
737.562
Use as target unit: Kilogram-force Metre per Second
Kilogram-force Metre per Second (kgf·m/s)
101.972

Refrigeration

Use as target unit: Ton of Refrigeration
Ton of Refrigeration (TR)
0.284345

CGS

Use as target unit: Erg per Second
Erg per Second (erg/s)
10,000,000,000
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Good to know

The power converter converts directly in your browser between SI and CGS units, mechanical work rate (horsepower variants), and refrigeration/heat flow. Mechanical horsepower, metric PS, electrical horsepower, and boiler horsepower are shown as separate definitions, as are BTU(IT)/h and BTU(th)/h.

Typical searches include kW to horsepower, watts to hp, and convert power. Calculation runs locally in the browser. Power is energy per time: kW is power, kWh is energy — a common point of confusion. dBm is logarithmic and therefore not included; TR describes cooling capacity, not mass.

Typical use cases

Convert engine power between horsepower variants

Convert kW to PS or mechanical horsepower, keeping in mind that PS, mechanical, and electrical horsepower are defined differently.

Assess heating and cooling capacity

Convert BTU/h to watts, for example for air conditioners or heaters, keeping in mind the separate definitions of BTU(IT)/h and BTU(th)/h.

Don't confuse power with energy

Use the converter to correctly convert power values such as kW, without accidentally equating them with energy values such as kWh.

Tips for better results

Don't equate W, VA, and var

Watts (real power), volt-amperes (apparent power), and var (reactive power) are not automatically interchangeable for AC — check which type of power is actually meant.

Check the horsepower variant carefully

Mechanical horsepower, metric PS, electrical horsepower, and boiler horsepower are separate definitions with slightly different values — use the variant that matches your source.

How it works

Step by step

  1. 1

    Enter value and source unit

    Enter the power value and choose the source unit from one of the four groups.

  2. 2

    Choose the target unit

    Choose the matching target unit, and note the specific definition for horsepower or BTU variants.

  3. 3

    Copy the result or swap units

    Copy one or all results, or swap the source and target unit for the next conversion.

Features

SI, CGS, mechanical work rate, and refrigeration

Four unit groups cover electrical, mechanical, and thermal power.

Local conversion

Calculation happens directly in the browser, without transmission to a server.

Clearly labeled definitions

Horsepower and BTU variants with multiple definitions are clearly distinguished instead of being mixed together.

Frequently asked questions

Are kW and kWh the same?

No. kW is a unit of power (energy per time), kWh is a unit of energy. This converter converts power units exclusively.

Why is dBm not included?

dBm is a logarithmic unit and cannot be converted with a simple factor like the other linear power units.

Are my inputs uploaded?

No. Conversion runs entirely locally in the browser.

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