Watt-hours (Wh)
The watt-hour is the energy of one watt for one hour, 3,600 J.
Convert watt-hours to any energy unit
1 watt-hour = 3,600 joules
Quick facts
- Unit
- Watt-hour (plural: watt-hours)
- Symbol
- Wh
- Measures
- Energy / Work / Heat
- System
- Electrical
- Equals
- 3,600 joules
- Definition
- 3,600 joules.
1 watt-hour in other units
| Joules | 3,600 J |
| Kilocalories | 0.8604206501 kcal |
| Kilowatt-hours | 0.001 kWh |
| British thermal units | 3.412141633 BTU |
| Calories | 860.4206501 cal |
| Kilojoules | 3.6 kJ |
| Calories (food) | 0.8604206501 Cal |
| Electronvolts | 2.2469433 × 1022 eV |
What is a watt-hour?
The watt-hour is the energy of one watt for one hour, 3,600 J. It is used for battery capacity: laptop batteries are 40–100 Wh, and airlines limit power banks to 100 Wh in carry-on luggage.
Where the watt-hour sits among energy units
The watt-hour is number 44 of 99 on our scale of energy units, ordered from smallest to largest.
Watt-hours in real life
- A smartphone battery is about 15 Wh
- Airlines allow power banks up to 100 Wh without approval
One watt-hour is about the energy of a food Calorie, or about 36% of the energy in an AA battery, or about 6.7% of the energy in a smartphone battery charge.
Top watt-hour conversions
- Watt-hours to joules
- Watt-hours to kilocalories
- Watt-hours to kilowatt-hours
- Watt-hours to British thermal units
- Watt-hours to calories
- Watt-hours to kilojoules
- Watt-hours to Calories (food)
- Watt-hours to electronvolts
- Watt-hours to foot-pounds
- Watt-hours to megajoules
- Watt-hours to therms
- Watt-hours to megawatt-hours
Common amounts of watt-hours
- 0.25 Wh
- 0.5 Wh
- 0.75 Wh
- 1 Wh
- 1.5 Wh
- 2 Wh
- 2.5 Wh
- 3 Wh
- 4 Wh
- 5 Wh
- 6 Wh
- 7 Wh
- 8 Wh
- 9 Wh
- 10 Wh
- 11 Wh
- 12 Wh
- 13 Wh
- 14 Wh
- 15 Wh
- 16 Wh
- 17 Wh
- 18 Wh
- 19 Wh
- 20 Wh
- 21 Wh
- 22 Wh
- 23 Wh
- 24 Wh
- 25 Wh
- 26 Wh
- 27 Wh
- 28 Wh
- 29 Wh
- 30 Wh
- 31 Wh
- 32 Wh
- 33 Wh
- 34 Wh
- 35 Wh
- 36 Wh
- 37 Wh
- 38 Wh
- 39 Wh
- 40 Wh
- 41 Wh
- 42 Wh
- 43 Wh
- 44 Wh
- 45 Wh
- 46 Wh
- 47 Wh
- 48 Wh
- 49 Wh
- 50 Wh
- 60 Wh
- 70 Wh
- 80 Wh
- 90 Wh
- 100 Wh
- 150 Wh
- 200 Wh
- 250 Wh
- 300 Wh
- 400 Wh
- 500 Wh
- 750 Wh
- 1,000 Wh
Convert watt-hours to all 98 other units
Metric (SI)
Electrical
Calories
- Wh to kcal
- Wh to cal
- Wh to Cal
- Wh to cal_IT
- Wh to Gcal
- Wh to Mcal
- Wh to cal₁₅
- Wh to th
- Wh to cal₂₀
- Wh to cal_mean
BTU & therms
- Wh to BTU
- Wh to thm
- Wh to MMBtu
- Wh to MBtu
- Wh to Dth
- Wh to quad
- Wh to thm (EC)
- Wh to BTU_th
- Wh to BTU₅₉
- Wh to CHU
- Wh to Q
- Wh to BTU₃₉
- Wh to BTU₆₀
- Wh to BTU_mean
Mechanical
- Wh to ft⋅lbf
- Wh to erg
- Wh to in⋅lbf
- Wh to hp⋅h
- Wh to L⋅atm
- Wh to kgf⋅m
- Wh to ft⋅pdl
- Wh to in⋅ozf
- Wh to PS⋅h
- Wh to cm³⋅atm
- Wh to ft³⋅atm
- Wh to ft³⋅psi
Atomic & physics
- Wh to eV
- Wh to MeV
- Wh to GeV
- Wh to keV
- Wh to TeV
- Wh to Eh
- Wh to kJ/mol
- Wh to kcal/mol
- Wh to meV
- Wh to cm⁻¹
- Wh to EP
- Wh to PeV
- Wh to Ry
- Wh to EeV
- Wh to K·k_B
- Wh to foe
- Wh to h·Hz
Fuel & explosive equivalents
- Wh to BOE
- Wh to t TNT
- Wh to toe
- Wh to kt
- Wh to Mt
- Wh to cubic foot of natural gas
- Wh to GGE
- Wh to Mtoe
- Wh to cubic meter of natural gas
- Wh to tce
- Wh to ktoe
- Wh to liter of gasoline
- Wh to Gt
- Wh to g TNT
- Wh to kg TNT
- Wh to MMBOE
- Wh to kBOE
- Wh to DGE
Everyday comparisons
Convert to watt-hours
- Joules to watt-hours
- Kilocalories to watt-hours
- Kilowatt-hours to watt-hours
- British thermal units to watt-hours
- Calories to watt-hours
- Kilojoules to watt-hours
- Calories (food) to watt-hours
- Electronvolts to watt-hours
- Foot-pounds to watt-hours
- Megajoules to watt-hours
- Therms to watt-hours
- Megawatt-hours to watt-hours
Frequently asked questions
What is a watt-hour?
The watt-hour is the energy of one watt for one hour, 3,600 J.
How is the watt-hour defined?
3,600 joules.
How many joules are in a watt-hour?
One watt-hour equals 3,600 joules.
How many kilocalories are in a watt-hour?
One watt-hour equals 0.8604206501 kilocalories.
How many kilowatt-hours are in a watt-hour?
One watt-hour equals 0.001 kilowatt-hours.