Convert Joules to Watt-hours

Enter the energy in joules below to get the value converted to watt-hours.

Results in Watt-hours:
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1 J = 0.000278 Wh

How to Convert Joules to Watt-hours

conversion scale showing joules and equivalent watt-hours energy values

To convert a joule measurement to a watt-hour measurement, multiply the energy by the conversion ratio. One joule is equal to 0.000278 watt-hours, so use this simple formula to convert:

watt-hours = joules × 0.000278

The energy in watt-hours is equal to the joules multiplied by 0.000278.

For example, here's how to convert 5 joules to watt-hours using the formula above.
5 J = (5 × 0.000278) = 0.001389 Wh

Joules and watt-hours are both units used to measure energy. Keep reading to learn more about each unit of measure.


The joule is the energy equal to the force on an object of one newton at a distance of one meter. One joule is equal to the heat energy dissipated by the current of one ampere through one ohm of resistance for one second.

One joule is also equal to the energy needed to move an electric charge of one coulomb through a potential difference of one volt. In addition, one joule is also equal to the one watt-second.

The joule is the SI derived unit for energy in the metric system. Joules can be abbreviated as J, for example 1 joule can be written as 1 J.


The watt-hour is a measure of electrical energy equal to one watt of power over a one hour period.

Watt-hours can be abbreviated as Wh, for example 1 watt-hour can be written as 1 Wh.

Joule Measurements and Equivalent Watt-hour Conversions

Common joule values converted to the equivalent watt-hour value
Joules Watt-hours
1 J 0.000278 Wh
2 J 0.000556 Wh
3 J 0.000833 Wh
4 J 0.001111 Wh
5 J 0.001389 Wh
6 J 0.001667 Wh
7 J 0.001944 Wh
8 J 0.002222 Wh
9 J 0.0025 Wh
10 J 0.002778 Wh
11 J 0.003056 Wh
12 J 0.003333 Wh
13 J 0.003611 Wh
14 J 0.003889 Wh
15 J 0.004167 Wh
16 J 0.004444 Wh
17 J 0.004722 Wh
18 J 0.005 Wh
19 J 0.005278 Wh
20 J 0.005556 Wh
21 J 0.005833 Wh
22 J 0.006111 Wh
23 J 0.006389 Wh
24 J 0.006667 Wh
25 J 0.006944 Wh
26 J 0.007222 Wh
27 J 0.0075 Wh
28 J 0.007778 Wh
29 J 0.008056 Wh
30 J 0.008333 Wh
31 J 0.008611 Wh
32 J 0.008889 Wh
33 J 0.009167 Wh
34 J 0.009444 Wh
35 J 0.009722 Wh
36 J 0.01 Wh
37 J 0.010278 Wh
38 J 0.010556 Wh
39 J 0.010833 Wh
40 J 0.011111 Wh

More Joule Energy Conversions

Convert to Kilojoules
1 J is equal to 0.001 kilojoules
Convert to Megajoules
1 J is equal to 1.0E-6 megajoules
Convert to Gigajoules
1 J is equal to 1.0E-9 gigajoules
Convert to Calories
1 J is equal to 0.239006 calories
Convert to Kilocalories
1 J is equal to 0.000239 kilocalories
Convert to Megacalories
1 J is equal to 2.3901E-7 megacalories
Watts x Time
Convert to Kilowatt-hours
1 J is equal to 2.7778E-7 kilowatt-hours
Convert to Megawatt-hours
1 J is equal to 2.7778E-10 megawatt-hours
Convert to Watt-seconds
1 J is equal to 1 watt-seconds
Thermal Units
Convert to British Thermal Units
1 J is equal to 0.000948 british thermal units
Convert to Million BTU
1 J is equal to 9.4782E-10 million BTU
Convert to Therms
1 J is equal to 9.4782E-9 therms
Convert to Quads
1 J is equal to 9.4782E-19 quads
Convert to Electronvolts
1 J is equal to 6,241,500,000,000,000,000 electronvolts
Convert to Kiloelectronvolts
1 J is equal to 6,241,500,000,000,000 kiloelectronvolts
Convert to Megaelectronvolts
1 J is equal to 6,241,509,343,260.2 megaelectronvolts