# Power

In physics, power (symbol: P) is the rate at which work is performed. In the SI system of measurement, power is measured in watts (symbol: W). This can be modeled as an energy flow, equivalent to the rate of change of the energy in a system, or the time rate of doing work.

Convert   unit(s)

### SI derived

Attowatt aW 1 1000
Femtowatt fW 0.001 1
Picowatt pW 10-6 0.001
Nanowatt nW 10-9 10-6
Microwatt µW 10-12 10-9
Milliwatt mW 10-15 10-14
Centiwatt cW 10-16 10-15
Deciwatt dW 10-17 10-16
Watt W 10-18 10-15
Decawatt daW 10-19 10-16
Hectowatt hW 10-20 10-17
Kilowatt kW 10-21 10-18
Megawatt MW 10-24 10-21
Gigawatt GW 10-27 10-24
Terawatt TW 10-30 10-27
Petawatt PW 10-33 10-30
Exawatt EW 10-36 10-33

### Joule based

Attojoule per second aJ/s 1 1000
Attojoule per minute 6×10-35 6×10-32
Attojoule per hour aJ/h 3.6×10-33 3.6×10-30
Femtojoule per second fJ/s 0.001 1
Femtojoule per minute 6×10-32 6×10-29
Femtojoule per hour fJ/h 3.6×10-30 3.6×10-27
Picojoule per second pJ/s 10-6 0.001
Picojoule per minute 6×10-29 6×10-26
Picojoule per hour pJ/h 3.6×10-27 3.6×10-24
Nanojoule per second nJ/s 10-9 10-6
Nanojoule per minute 6×10-26 6×10-23
Nanojoule per hour nJ/h 3.6×10-24 3.6×10-21
Mircojoule per second µJ/s 10-12 10-9
Microjoule per minute 6×10-23 6×10-20
Microjoule per hour µJ/h 3.6×10-21 3.6×10-18
Millijoule per second mJ/s 10-15 10-14
Millijoule per minute 6×10-20 6×10-17
Millijoule per hour mJ/h 3.6×10-18 3.6×10-15
Centijoule per second cJ/s 10-16 10-15
Centijoule per minute 6×10-19 6×10-16
Centijoule per hour cJ/h 3.6×10-17 3.6×10-14
Decijoule per second dJ/s 10-17 10-16
Decijoule per minute 6×10-18 6×10-15
Decijoule per hour dJ/h 3.6×10-16 3.6×10-13
Joule per second J/s 10-18 10-15
Joule per minute 6×10-17 6×10-14
Joule per hour J/h 3.6×10-15 3.6×10-12
Decajoule per second daJ/s 10-19 10-16
Decajoule per minute 6×10-16 6×10-13
Decajoule per hour daJ/h 3.6×10-14 3.6×10-11
Hectojoule per second hJ/s 10-20 10-17
Hectojoule per minute 6×10-15 6×10-12
Hectojoule per hour hJ/h 3.6×10-13 3.6×10-10
Kilojoule per second kJ/s 10-21 10-18
Kilojoule per minute 6×10-14 6×10-11
Kilojoule per hour kJ/h 3.6×10-12 3.6×10-9
Megajoule per second MJ/s 10-24 10-21
Megajoule per minute 6×10-11 6×10-8
Megajoule per hour MJ/h 3.6×10-9 3.6×10-6
Gigajoule per second GJ/s 10-27 10-24
Gigajoule per minute 6×10-8 0.0001
Gigajoule per hour GJ/h 3.6×10-6 0.0036
Terajoule per second TJ/s 10-30 10-27
Terajoule per minute 0.0001 0.06
Terajoule per hour TJ/h 0.0036 3.6
Petajoule per second PJ/s 10-33 10-30
Petajoule per hour PJ/h 3.6 3600
Exajoule per second EJ/s 10-36 10-33
Exajoule per hour EJ/h 3600 3600000

### Calorie based

Calorie per second (international) cal/s 2.3885×10-19 2.3885×10-16
Kilocalorie per second (international) kcal/s 2.3885×10-16 2.3885×10-13
Calorie per second (thermochemical) cal/s 2.3901×10-19 2.3901×10-16
Kilocalorie per second (thermochemical) kcal/s 2.3901×10-16 2.3901×10-13
Calorie per minute (international) 1.4331×10-17 1.4331×10-14
Kilocalorie per minute (international) 1.4331×10-14 1.4331×10-11
Calorie per minute (thermochemical) 1.434×10-17 1.434×10-14
Kilocalorie per minute (thermochemical) 1.434×10-14 1.434×10-11
Calorie per hour (international) cal/h 8.5985×10-16 8.5985×10-13
Kilocalorie per hour (international) kcal/h 8.5985×10-13 8.5985×10-10
Calorie per hour (thermochemical) cal/h 8.6042×10-16 8.6042×10-13
Kilocalorie per hour (thermochemical) kcal/h 8.6042×10-13 8.6042×10-10

### British Thermal Unit based

British thermal unit per second (international) Btu/s 9.4782×10-22 9.4782×10-19
British thermal unit per second (thermochemical) Btu/s 9.4845×10-22 9.4845×10-19
British thermal unit per hour (international) Btu/h 3.4121×10-18 3.4121×10-15
British thermal unit per hour (thermochemical) Btu/h 3.4144×10-18 3.4144×10-15

### Horsepower

Horsepower hp 1.341×10-21 1.341×10-18
Horsepower (metric) hp(M) 1.3596×10-21 1.3596×10-18
Horsepower (mechanical) hp(I) 1.341×10-21 1.341×10-18
Horsepower (electrical) hp(E) 1.3405×10-21 1.3405×10-18
Horsepower (boiler) hp(S) 1.0194×10-22 1.0194×10-19

### Other

Volt-ampere VA 10-18 10-15
Kilovolt-ampere kVA 10-21 10-18
Pound-foot per second 7.3756×10-18 7.3756×10-15
Pound-foot per minute 4.4254×10-17 4.4254×10-14
Pound-foot per hour 2.6552×10-15 2.6552×10-12
Erg per second erg/s 10-25 10-22
Ton of refrigeration RT 2.8435×10-22 2.8435×10-19

### Result formatting:

Decimal precision:

Apply digit grouping: