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Engineering

Power Converter

Power is the rate at which energy is used or produced. The SI unit is the watt. Motors and engines are often rated in horsepower, appliances and solar systems use watts and kilowatts, and HVAC equipment uses BTU per hour or tons of refrigeration. Mechanical, metric, and electric horsepower all differ slightly.

72 units supported Base unit watt (W)

1 W
0.001 kW

Multiply the number of watts by 0.001 to get kilowatts. How this is calculated

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About power conversion

Power conversion is commonly needed when engines, appliances, solar panels, and HVAC sizing.

Popular conversions

Convert Watt to other power units

1 W expressed in every other power unit on this site.

  • Kilowatt kW 0.001
  • Megawatt MW 0.000001
  • Gigawatt GW 1e-9
  • Terawatt TW 1e-12
  • Milliwatt mW 1,000
  • Microwatt µW 1,000,000
  • Nanowatt nW 1,000,000,000
  • Picowatt pW 1,000,000,000,000
  • Femtowatt fW 1,000,000,000,000,000
  • Attowatt aW 1e+18
  • Centiwatt cW 100
  • Deciwatt dW 10
  • Dekawatt daW 0.1
  • Hectowatt hW 0.01
  • Petawatt PW 1e-15
  • Exawatt EW 1e-18
  • Volt-ampere VA 1
  • Kilovolt-ampere kVA 0.001
  • Joule per Second J/s 1
  • Kilojoule per Second kJ/s 0.001
  • Joule per Hour J/h 3,600
  • Megajoule per Second MJ/s 0.000001
  • Gigajoule per Second GJ/s 1e-9
  • Terajoule per Second TJ/s 1e-12
  • Petajoule per Second PJ/s 1e-15
  • Exajoule per Second EJ/s 1e-18
  • Hectojoule per Second hJ/s 0.01
  • Dekajoule per Second daJ/s 0.1
  • Decijoule per Second dJ/s 10
  • Centijoule per Second cJ/s 100
  • Millijoule per Second mJ/s 1,000
  • Microjoule per Second µJ/s 1,000,000
  • Nanojoule per Second nJ/s 1,000,000,000
  • Picojoule per Second pJ/s 1,000,000,000,000
  • Femtojoule per Second fJ/s 1,000,000,000,000,000
  • Attojoule per Second aJ/s 1e+18
  • Joule per Minute J/min 60
  • Kilojoule per Hour kJ/h 3.6
  • Kilojoule per Minute kJ/min 0.06
  • Erg per Second erg/s 10,000,000
  • Horsepower (mechanical) hp 0.0013410221
  • Horsepower (metric) PS 0.0013596216
  • Horsepower (electric) hp(E) 0.0013404826
  • Horsepower (boiler) hp(S) 0.000101942
  • Horsepower (water) hp(water) 0.0013404053
  • BTU per Hour BTU/h 3.4121416
  • BTU per Minute BTU/min 0.056869027
  • BTU per Second BTU/s 0.00094781712
  • MBTU per Hour MBTU/h 0.0034121416
  • MMBTU per Hour MMBTU/h 0.0000034121416
  • Ton of Refrigeration RT 0.00028434514
  • Calorie (th) per Second cal(th)/s 0.23900574
  • Kilocalorie (th) per Hour kcal(th)/h 0.86042065
  • Kilocalorie (th) per Minute kcal(th)/min 0.014340344
  • Kilocalorie (th) per Second kcal(th)/s 0.00023900574
  • Calorie (th) per Hour cal(th)/h 860.42065
  • Calorie (th) per Minute cal(th)/min 14.340344
  • Calorie (IT) per Second cal(IT)/s 0.2388459
  • Calorie (IT) per Minute cal(IT)/min 14.330754
  • Calorie (IT) per Hour cal(IT)/h 859.84523
  • Kilocalorie (IT) per Second kcal(IT)/s 0.0002388459
  • Kilocalorie (IT) per Minute kcal(IT)/min 0.014330754
  • Kilocalorie (IT) per Hour kcal(IT)/h 0.85984523
  • BTU (th) per Hour BTU(th)/h 3.4144251
  • BTU (th) per Minute BTU(th)/min 0.056907085
  • BTU (th) per Second BTU(th)/s 0.00094845141
  • Foot-pound per Second ft·lbf/s 0.73756215
  • Foot-pound per Minute ft·lbf/min 44.253729
  • Foot-pound per Hour ft·lbf/h 2,655.2237
  • Kilogram-force Meter per Second kgf·m/s 0.10197162
  • Poundal-foot per Second pdl·ft/s 23.73036

Complete list of power units

All 72 units this converter supports, each stated against the watt (W).

72 units

Unit Symbol System In watts Conversions
Watt W SI base unit (W) watts to btu/hwatts to hp
Kilowatt kW SI 1 kW = 1,000 W kw to hpkw to btu/h
Megawatt MW SI 1 MW = 1,000,000 W —
Gigawatt GW SI 1 GW = 1,000,000,000 W —
Terawatt TW SI 1 TW = 1,000,000,000,000 W —
Milliwatt mW SI 1 mW = 0.001 W —
Microwatt µW SI 1 µW = 0.000001 W —
Nanowatt nW SI 1 nW = 1e-9 W —
Picowatt pW SI 1 pW = 1e-12 W —
Femtowatt fW SI 1 fW = 1e-15 W —
Attowatt aW SI 1 aW = 1e-18 W —
Centiwatt cW SI 1 cW = 0.01 W —
Deciwatt dW SI 1 dW = 0.1 W —
Dekawatt daW SI 1 daW = 10 W —
Hectowatt hW SI 1 hW = 100 W —
Petawatt PW SI 1 PW = 1e+15 W —
Exawatt EW SI 1 EW = 1e+18 W —
Volt-ampere VA SI 1 VA = 1 W —
Kilovolt-ampere kVA SI 1 kVA = 1,000 W —
Joule per Second J/s SI 1 J/s = 1 W —
Kilojoule per Second kJ/s SI 1 kJ/s = 1,000 W —
Joule per Hour J/h SI 1 J/h = 0.000277777777778 W —
Megajoule per Second MJ/s SI 1 MJ/s = 1,000,000 W —
Gigajoule per Second GJ/s SI 1 GJ/s = 1,000,000,000 W —
Terajoule per Second TJ/s SI 1 TJ/s = 1,000,000,000,000 W —
Petajoule per Second PJ/s SI 1 PJ/s = 1e+15 W —
Exajoule per Second EJ/s SI 1 EJ/s = 1e+18 W —
Hectojoule per Second hJ/s SI 1 hJ/s = 100 W —
Dekajoule per Second daJ/s SI 1 daJ/s = 10 W —
Decijoule per Second dJ/s SI 1 dJ/s = 0.1 W —
Centijoule per Second cJ/s SI 1 cJ/s = 0.01 W —
Millijoule per Second mJ/s SI 1 mJ/s = 0.001 W —
Microjoule per Second µJ/s SI 1 µJ/s = 0.000001 W —
Nanojoule per Second nJ/s SI 1 nJ/s = 1e-9 W —
Picojoule per Second pJ/s SI 1 pJ/s = 1e-12 W —
Femtojoule per Second fJ/s SI 1 fJ/s = 1e-15 W —
Attojoule per Second aJ/s SI 1 aJ/s = 1e-18 W —
Joule per Minute J/min SI 1 J/min = 0.0166666666667 W —
Kilojoule per Hour kJ/h SI 1 kJ/h = 0.277777777778 W —
Kilojoule per Minute kJ/min SI 1 kJ/min = 16.6666666667 W —
Erg per Second erg/s Metric 1 erg/s = 1e-7 W —
Horsepower (mechanical) hp Imperial 1 hp = 745.699871582 W hp to kwhp to watts
Horsepower (metric) PS Metric 1 PS = 735.49875 W —
Horsepower (electric) hp(E) US 1 hp(E) = 746 W —
Horsepower (boiler) hp(S) US 1 hp(S) = 9,809.5 W —
Horsepower (water) hp(water) US 1 hp(water) = 746.043 W —
BTU per Hour BTU/h Imperial 1 BTU/h = 0.293071070172 W btu/h to wattsbtu/h to kw
BTU per Minute BTU/min Imperial 1 BTU/min = 17.5842642103 W —
BTU per Second BTU/s Imperial 1 BTU/s = 1,055.05585262 W —
MBTU per Hour MBTU/h Imperial 1 MBTU/h = 293.071070172 W —
MMBTU per Hour MMBTU/h Imperial 1 MMBTU/h = 293,071.070172 W —
Ton of Refrigeration RT US 1 RT = 3,516.85284207 W tons of refrigeration to kw
Calorie (th) per Second cal(th)/s Metric 1 cal(th)/s = 4.184 W —
Kilocalorie (th) per Hour kcal(th)/h Metric 1 kcal(th)/h = 1.16222222222 W —
Kilocalorie (th) per Minute kcal(th)/min Metric 1 kcal(th)/min = 69.7333333333 W —
Kilocalorie (th) per Second kcal(th)/s Metric 1 kcal(th)/s = 4,184 W —
Calorie (th) per Hour cal(th)/h Metric 1 cal(th)/h = 0.00116222222222 W —
Calorie (th) per Minute cal(th)/min Metric 1 cal(th)/min = 0.0697333333333 W —
Calorie (IT) per Second cal(IT)/s Metric 1 cal(IT)/s = 4.1868 W —
Calorie (IT) per Minute cal(IT)/min Metric 1 cal(IT)/min = 0.06978 W —
Calorie (IT) per Hour cal(IT)/h Metric 1 cal(IT)/h = 0.001163 W —
Kilocalorie (IT) per Second kcal(IT)/s Metric 1 kcal(IT)/s = 4,186.8 W —
Kilocalorie (IT) per Minute kcal(IT)/min Metric 1 kcal(IT)/min = 69.78 W —
Kilocalorie (IT) per Hour kcal(IT)/h Metric 1 kcal(IT)/h = 1.163 W —
BTU (th) per Hour BTU(th)/h Imperial 1 BTU(th)/h = 0.292875073469 W —
BTU (th) per Minute BTU(th)/min Imperial 1 BTU(th)/min = 17.5725044081 W —
BTU (th) per Second BTU(th)/s Imperial 1 BTU(th)/s = 1,054.35026449 W —
Foot-pound per Second ft·lbf/s Imperial 1 ft·lbf/s = 1.35581794833 W —
Foot-pound per Minute ft·lbf/min Imperial 1 ft·lbf/min = 0.0225969658055 W —
Foot-pound per Hour ft·lbf/h Imperial 1 ft·lbf/h = 0.000376616096759 W —
Kilogram-force Meter per Second kgf·m/s Metric 1 kgf·m/s = 9.80665 W —
Poundal-foot per Second pdl·ft/s Imperial 1 pdl·ft/s = 0.0421401100938 W —

Scroll the table sideways to see every column.

Frequently asked questions

What is the base unit for power?

Power conversions on this site are calculated against the watt (W).

Which power units can I convert?

You can convert between 72 units, including watt, kilowatt, megawatt, gigawatt, and more.

Where is power conversion useful?

It is commonly needed when engines, appliances, solar panels, and HVAC sizing.

Does this converter mix measurement systems?

The converter supports SI, Metric, Imperial, US units and keeps their exact definitions separate so results stay accurate.

Related categories

Pressure Convert pascal, bar, psi, and atmospheres. 50 units Pa · bar · psi · atm Energy Convert joules, calories, kilowatt-hours, and BTU. 51 units J · kcal · kWh · BTU Force Convert newtons, pound-force, and kilogram-force. 30 units N · lbf · kgf · kN Angle Convert degrees, radians, and gradians. 18 units ° · rad · grad · rev

Conversion factors are based on internationally agreed unit definitions. See our methodology and sources for details on how these values are verified.