Daily Unit Converter

Converter category

Power Converter

Convert between watts, kilowatts, megawatts, horsepower (mechanical, metric, electrical, boiler), BTU/hour, tons of refrigeration, and many other power units.

Universal Power Converter

About power conversions

Power conversions are used in electrical engineering, automotive performance, heating and cooling, fitness equipment, and energy management. Our power converter covers SI units such as watts, kilowatts, and megawatts, plus electrical units like volt-amperes and kilovolt-amperes. It includes mechanical units such as horsepower, metric horsepower, boiler horsepower, and foot-pounds per minute, plus thermal units like BTU per hour, BTU per second, and kilocalories per hour. Whether you are sizing an engine, comparing appliance ratings, or analyzing energy consumption, this converter gives accurate results.

Most popular power conversions

Watt to Kilowatt

Converts watt to kilowatt for power.

Kilowatt to Watt

Converts kilowatt to watt for power.

Watt to Horsepower (Mechanical)

Converts watt to horsepower (mechanical) for power.

Horsepower (Mechanical) to Watt

Converts horsepower (mechanical) to watt for power.

Kilowatt to Horsepower (Mechanical)

Converts kilowatt to horsepower (mechanical) for power.

Horsepower (Mechanical) to Kilowatt

Converts horsepower (mechanical) to kilowatt for power.

Watt to BTU per Hour

Converts watt to btu per hour for power.

BTU per Hour to Watt

Converts btu per hour to watt for power.

Kilowatt to Megawatt

Converts kilowatt to megawatt for power.

Megawatt to Kilowatt

Converts megawatt to kilowatt for power.

Available units

Watt (W)Kilowatt (kW)Megawatt (MW)Horsepower (Mechanical) (hp)Horsepower (Metric) (PS)Electrical Horsepower (ehp)Boiler Horsepower (boiler hp)BTU per Hour (BTU/h)Ton of Refrigeration (TR)Foot-pound per Minute (ft·lb/min)Exawatt (EW)Petawatt (PW)Terawatt (TW)Hectowatt (hW)Decawatt (daW)Deciwatt (dW)Centiwatt (cW)Milliwatt (mW)Microwatt (µW)Nanowatt (nW)Picowatt (pW)Femtowatt (fW)Attowatt (aW)Horsepower (550 ft·lbf/s) (hp)Horsepower (Electric) (hp_E)Horsepower (Water) (hp_W)Pferdestaerke (PS) (PS)BTU (IT) per Minute (BTU/min)BTU (IT) per Second (BTU/s)BTU (Th) per Hour (BTU_th/h)BTU (Th) per Minute (BTU_th/min)BTU (Th) per Second (BTU_th/s)MBTU per Hour (MBTU/h)MBH (MBH)Kilocalorie (IT) per Hour (kcal_IT/h)Kilocalorie (IT) per Minute (kcal_IT/min)Kilocalorie (IT) per Second (kcal_IT/s)Calorie (IT) per Hour (cal_IT/h)Calorie (IT) per Minute (cal_IT/min)Calorie (IT) per Second (cal_IT/s)Foot-pound per Hour (ft·lbf/h)Foot-pound per Minute (ft·lbf/min)Erg per Second (erg/s)Kilovolt-Ampere (kVA)Volt-Ampere (VA)Newton Meter per Second (N·m/s)Joule per Second (J/s)

Popular power conversions (2162 total)

Everyday power

Horsepower (Metric) to Milliwatt

Converts horsepower (metric) to milliwatt for power.

Horsepower (Metric) to Microwatt

Converts horsepower (metric) to microwatt for power.

Horsepower (Metric) to Nanowatt

Converts horsepower (metric) to nanowatt for power.

Horsepower (Metric) to Picowatt

Converts horsepower (metric) to picowatt for power.

Horsepower (Metric) to Femtowatt

Converts horsepower (metric) to femtowatt for power.

Horsepower (Metric) to Attowatt

Converts horsepower (metric) to attowatt for power.

Horsepower (Metric) to Horsepower (550 ft·lbf/s)

Converts horsepower (metric) to horsepower (550 ft·lbf/s) for power.

Horsepower (Metric) to Horsepower (Electric)

Converts horsepower (metric) to horsepower (electric) for power.

Horsepower (Metric) to Horsepower (Water)

Converts horsepower (metric) to horsepower (water) for power.

Horsepower (Metric) to Pferdestaerke (PS)

Converts horsepower (metric) to pferdestaerke (ps) for power.

Horsepower (Metric) to BTU (IT) per Minute

Converts horsepower (metric) to btu (it) per minute for power.

Horsepower (Metric) to BTU (IT) per Second

Converts horsepower (metric) to btu (it) per second for power.

Horsepower (Metric) to BTU (Th) per Hour

Converts horsepower (metric) to btu (th) per hour for power.

Horsepower (Metric) to BTU (Th) per Minute

Converts horsepower (metric) to btu (th) per minute for power.

Horsepower (Metric) to BTU (Th) per Second

Converts horsepower (metric) to btu (th) per second for power.

Horsepower (Metric) to MBTU per Hour

Converts horsepower (metric) to mbtu per hour for power.

Horsepower (Metric) to MBH

Converts horsepower (metric) to mbh for power.

Horsepower (Metric) to Kilocalorie (IT) per Hour

Converts horsepower (metric) to kilocalorie (it) per hour for power.

Horsepower (Metric) to Kilocalorie (IT) per Minute

Converts horsepower (metric) to kilocalorie (it) per minute for power.

Horsepower (Metric) to Kilocalorie (IT) per Second

Converts horsepower (metric) to kilocalorie (it) per second for power.

Horsepower (Metric) to Calorie (IT) per Hour

Converts horsepower (metric) to calorie (it) per hour for power.

Horsepower (Metric) to Calorie (IT) per Minute

Converts horsepower (metric) to calorie (it) per minute for power.

Horsepower (Metric) to Calorie (IT) per Second

Converts horsepower (metric) to calorie (it) per second for power.

Horsepower (Metric) to Foot-pound per Hour

Converts horsepower (metric) to foot-pound per hour for power.

Horsepower (Metric) to Foot-pound per Minute

Converts horsepower (metric) to foot-pound per minute for power.

Horsepower (Metric) to Erg per Second

Converts horsepower (metric) to erg per second for power.

Horsepower (Metric) to Kilovolt-Ampere

Converts horsepower (metric) to kilovolt-ampere for power.

Horsepower (Metric) to Volt-Ampere

Converts horsepower (metric) to volt-ampere for power.

Horsepower (Metric) to Newton Meter per Second

Converts horsepower (metric) to newton meter per second for power.

Horsepower (Metric) to Joule per Second

Converts horsepower (metric) to joule per second for power.

Electrical Horsepower to Watt

Converts electrical horsepower to watt for power.

Electrical Horsepower to Kilowatt

Converts electrical horsepower to kilowatt for power.

Electrical Horsepower to Megawatt

Converts electrical horsepower to megawatt for power.

Electrical Horsepower to Horsepower (Mechanical)

Converts electrical horsepower to horsepower (mechanical) for power.

Electrical Horsepower to Horsepower (Metric)

Converts electrical horsepower to horsepower (metric) for power.

Electrical Horsepower to Boiler Horsepower

Converts electrical horsepower to boiler horsepower for power.

Electrical Horsepower to BTU per Hour

Converts electrical horsepower to btu per hour for power.

Electrical Horsepower to Ton of Refrigeration

Converts electrical horsepower to ton of refrigeration for power.

Electrical Horsepower to Foot-pound per Minute

Converts electrical horsepower to foot-pound per minute for power.

Electrical Horsepower to Exawatt

Converts electrical horsepower to exawatt for power.

Electrical Horsepower to Petawatt

Converts electrical horsepower to petawatt for power.

Electrical Horsepower to Terawatt

Converts electrical horsepower to terawatt for power.

Electrical Horsepower to Hectowatt

Converts electrical horsepower to hectowatt for power.

Electrical Horsepower to Decawatt

Converts electrical horsepower to decawatt for power.

Electrical Horsepower to Deciwatt

Converts electrical horsepower to deciwatt for power.

Electrical Horsepower to Centiwatt

Converts electrical horsepower to centiwatt for power.

Electrical Horsepower to Milliwatt

Converts electrical horsepower to milliwatt for power.

Electrical Horsepower to Microwatt

Converts electrical horsepower to microwatt for power.

Electrical Horsepower to Nanowatt

Converts electrical horsepower to nanowatt for power.

Electrical Horsepower to Picowatt

Converts electrical horsepower to picowatt for power.

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Unit definitions

Watt (W)

A watt is the SI unit of power, the rate of energy transfer. 1 W = 1 J/s.

Origin: Named after James Watt, inventor of practical steam engine.

Current use: Electrical rating, Light bulbs, Appliance specs

Kilowatt (kW)

A kilowatt is 1000 watts, commonly used for motor and appliance ratings.

Origin: Standard unit for most electrical devices.

Current use: Motor vehicles, Home appliances, Industrial machinery

Megawatt (MW)

A megawatt is one million watts, used for large facilities and power plants.

Origin: Large-scale power measurement unit.

Current use: Power plants, Data centers, Industrial processes

Horsepower (Mechanical) (hp)

Mechanical horsepower is 550 foot-pounds per second, about 746 W.

Origin: James Watt coined horsepower to market steam engines.

Current use: Engine rating, Vehicle power, Machinery

Horsepower (Metric) (PS)

Metric horsepower is slightly different from mechanical HP. 1 PS = 735.5 W.

Origin: Used in Germany and France for vehicle rating.

Current use: European vehicles, German engineering, Motorcycles

Electrical Horsepower (ehp)

Electrical horsepower is 746 watts, used for motor ratings in US.

Origin: Defined for electrical motors.

Current use: Electric motors, US industry, Motor specifications

Boiler Horsepower (boiler hp)

Boiler horsepower is the energy to evaporate 34.5 lb of water/hour at 212°F.

Origin: Original definition for steam boilers.

Current use: Boilers, Steam engines, Heating systems

BTU per Hour (BTU/h)

BTU per hour is the standard unit for HVAC cooling capacity. 1 RT ≈ 12,000 BTU/h.

Origin: Used for air conditioning and heating equipment rating.

Current use: HVAC systems, Air conditioners, Furnaces

Ton of Refrigeration (TR)

Ton of refrigeration is the heat to melt 1 ton of ice in 24 hours. 1 TR = 12,000 BTU/h.

Origin: Original refrigeration unit based on ice melting.

Current use: Refrigeration, HVAC, Cold storage

Foot-pound per Minute (ft·lb/min)

Power unit in Imperial system. 1 ft·lb/min = 0.0226 W.

Origin: Imperial unit of mechanical power.

Current use: Mechanical power, Historical engineering, Small power

Exawatt (EW)

1 quintillion watts. Total Sun's power output.

Origin: Metric prefix exa- = 10^18.

Current use: Solar constant, Astrophysics, Planetary

Petawatt (PW)

Quadrillion watts. Laser power.

Origin: Metric prefix peta- = 10^15.

Current use: Lasers, Research, Pulse power

Terawatt (TW)

Trillion watts. World power consumption.

Origin: Metric prefix tera- = 10^12.

Current use: World energy, Large grid, Geophysical

Hectowatt (hW)

100 watts. Bright light bulb.

Origin: Metric prefix hecto- = 100.

Current use: Lighting, Small appliances, Labs

Decawatt (daW)

10 watts. Small device.

Origin: Metric prefix deca- = 10.

Current use: Electronics, Small equipment

Deciwatt (dW)

0.1 watt. Very small.

Origin: Metric prefix deci- = 0.1.

Current use: RF power, Small electronics

Centiwatt (cW)

0.01 watt. Tiny power.

Origin: Metric prefix centi- = 0.01.

Current use: Low-power electronics, Research

Milliwatt (mW)

0.001 watt. Small electronics.

Origin: Metric prefix milli- = 0.001.

Current use: Electronics, Lasers, RF

Microwatt (µW)

One millionth of a watt.

Origin: Metric prefix micro- = 10^-6.

Current use: Pacemakers, Sensors, Medical

Nanowatt (nW)

One billionth of a watt.

Origin: Metric prefix nano- = 10^-9.

Current use: Radio receivers, Scientific

Picowatt (pW)

One trillionth of a watt.

Origin: Metric prefix pico- = 10^-12.

Current use: Nanotechnology, Research

Femtowatt (fW)

One quadrillionth of a watt.

Origin: Metric prefix femto- = 10^-15.

Current use: Advanced research, Spectroscopy

Attowatt (aW)

One quintillionth of a watt.

Origin: Metric prefix atto- = 10^-18.

Current use: Quantum optics, Fundamental physics

Horsepower (550 ft·lbf/s) (hp)

550 ft·lbf/s = 746 W. US mechanical hp.

Origin: James Watt's definition.

Current use: US engines, Machinery, Vehicles

Horsepower (Electric) (hp_E)

Electric motor hp = 746 W.

Origin: US electrical standard.

Current use: Electric motors, US industry

Horsepower (Water) (hp_W)

Water pump hp = 746.043 W.

Origin: Hydraulic standard.

Current use: Water pumps, Hydraulics

Pferdestaerke (PS) (PS)

German metric hp = 735.5 W.

Origin: German engineering.

Current use: European cars, German machinery

BTU (IT) per Minute (BTU/min)

17.6 watts. HVAC rate.

Origin: Cooling capacity.

Current use: Air conditioning, HVAC

BTU (IT) per Second (BTU/s)

1055 W. Large heating rate.

Origin: Heat transfer.

Current use: Industrial heating, Power

BTU (Th) per Hour (BTU_th/h)

0.293 watts. Small heat rate.

Origin: Thermodynamics.

Current use: Small heating, Labs

BTU (Th) per Minute (BTU_th/min)

17.6 watts. Heat transfer.

Origin: Thermodynamics.

Current use: HVAC, Heating

BTU (Th) per Second (BTU_th/s)

1054 W. Large heat rate.

Origin: Thermodynamics.

Current use: Industrial, Power

MBTU per Hour (MBTU/h)

293 watts. HVAC.

Origin: US heating standard.

Current use: US HVAC, Gas furnaces

MBH (MBH)

Same as MBTU/h. US HVAC.

Origin: US industry.

Current use: US heating, HVAC

Kilocalorie (IT) per Hour (kcal_IT/h)

1.16 watts. Metabolic rate.

Origin: Biology standard.

Current use: Metabolism, Nutrition, Biology

Kilocalorie (IT) per Minute (kcal_IT/min)

69.8 watts. Exercise power.

Origin: Biology.

Current use: Exercise physiology, Sports

Kilocalorie (IT) per Second (kcal_IT/s)

4187 watts. Large heat rate.

Origin: Thermodynamics.

Current use: Industrial heating, Power

Calorie (IT) per Hour (cal_IT/h)

Very small heat rate.

Origin: Small scale.

Current use: Labs, Small systems

Calorie (IT) per Minute (cal_IT/min)

Small heat rate.

Origin: Small scale.

Current use: Small heating, Labs

Calorie (IT) per Second (cal_IT/s)

4.2 watts. Moderate.

Origin: Heat transfer.

Current use: Food science, Labs

Foot-pound per Hour (ft·lbf/h)

Very small mechanical power.

Origin: Small scale.

Current use: Small mechanisms

Foot-pound per Minute (ft·lbf/min)

Small Imperial power.

Origin: US small scale.

Current use: Small motors, Labs

Erg per Second (erg/s)

CGS power = 0.1 µW.

Origin: CGS system.

Current use: Physics, Small systems

Kilovolt-Ampere (kVA)

Apparent power = 1000 VA.

Origin: Electrical engineering.

Current use: Generators, Transformers, UPS

Volt-Ampere (VA)

Apparent power unit.

Origin: Electrical standard.

Current use: Electrical, Power systems

Newton Meter per Second (N·m/s)

Same as watt. SI power.

Origin: Mechanics power.

Current use: Physics, Mechanics

Joule per Second (J/s)

Same as watt. SI.

Origin: Energy rate.

Current use: Physics, Engineering

Common uses for power conversions

Power conversions are used for appliance ratings, engine specifications, electricity bills, solar systems, HVAC sizing, motors, and fitness equipment.

Frequently asked questions about power

How many watts are in 1 horsepower?+

One mechanical horsepower equals approximately 745.7 watts.

What is the difference between kilowatt and kilowatt-hour?+

A kilowatt measures power, which is the rate of energy use. A kilowatt-hour measures energy used over time, equal to one kilowatt running for one hour.

Which power units does this converter support?+

It supports SI, electrical, mechanical, thermal, and imperial power units — over 45 in total.