Convert joules to watt-hours
1 J = 0.000277777777778 Wh — exactly. Both units are defined against the SI, so this factor is a fraction, not an approximation.
0.000 277 777 777 778Wh
As a fraction: 1/3600
More converter tools
Readable results
Ranges, ± tolerances, feet/inches and clock durations work in the value field.
Unit picker
Export this result
1 J = 0.000277777777778 Wh
Show this value in all 39 energy & work units
- Petajoules PJ 1e-15
- Terajoules TJ 1e-12
- Gigajoules GJ 1e-9
- Megajoules MJ 0.000 001
- Kilojoules kJ 0.001
- Joules J 1
- Millijoules mJ 1000
- Microjoules µJ 1 000 000
- Nanojoules nJ 1 000 000 000
- Watt-hours Wh 0.000 277 777 777 778
- Kilowatt-hours kWh 0.000 000 277 777 777 778
- Megawatt-hours MWh 2.77777777778e-10
- Gigawatt-hours GWh 2.77777777778e-13
- Terawatt-hours TWh 2.77777777778e-16
- Calorie (thermochemical)s cal 0.239 005 736 138
- Kilocalories kcal 0.000 239 005 736 138
- Calorie (IT)s cal (IT) 0.238 845 896 627
- Kilocalorie (IT)s kcal (IT) 0.000 238 845 896 627
- British thermal units BTU 0.000 947 817 120 313
- BTU (thermochemical)s BTU (th) 0.000 948 451 652 677
- Million BTUs MMBTU 9.47817120313e-10
- Therm (US)s thm 9.48043427973e-9
- Therm (EC)s thm (EC) 9.47816987913e-9
- Electronvolts eV 6.24150907446e+18
- Kiloelectronvolts keV 6 241 509 074 460 000
- Megaelectronvolts MeV 6 241 509 074 460
- Gigaelectronvolts GeV 6 241 509 074.46
- Teraelectronvolts TeV 6 241 509.074 46
- Ergs erg 10 000 000
- Foot-pounds ft·lbf 0.737 562 149 277
- Inch-pounds in·lbf 8.850 745 791 33
- Foot-poundals ft·pdl 23.730 360 404 2
- Horsepower-hours hp·h 0.000 000 372 506 135 999
- Tonne of TNTs t TNT 2.39005736138e-10
- Kiloton of TNTs kt TNT 2.39005736138e-13
- Megaton of TNTs Mt TNT 2.39005736138e-16
- Hartrees Eₕ 2.2937122784e+17
- Rydbergs Ry 4.58742455679e+17
- Quads quad 9.47817120313e-19
Every row is Joule (J) converted through the joule, in exact rational arithmetic.
How to convert joules to watt-hours
Multiply the number of joules by 0.000277777777778 to get watt-hours.
Joule to Watt-hour conversion table
| Joules (J) | Watt-hours (Wh) |
|---|---|
| 1 J | 0.000 277 777 78 |
| 2 J | 0.000 555 555 56 |
| 3 J | 0.000 833 333 33 |
| 5 J | 0.001 388 888 9 |
| 10 J | 0.002 777 777 8 |
| 20 J | 0.005 555 555 6 |
| 25 J | 0.006 944 444 4 |
| 50 J | 0.013 888 889 |
| 100 J | 0.027 777 778 |
| 250 J | 0.069 444 444 |
| 500 J | 0.138 888 89 |
| 1000 J | 0.277 777 78 |
Watt-hour to Joule conversion table
| Watt-hours (Wh) | Joules (J) |
|---|---|
| 1 Wh | 3600 |
| 2 Wh | 7200 |
| 3 Wh | 10 800 |
| 5 Wh | 18 000 |
| 10 Wh | 36 000 |
| 20 Wh | 72 000 |
| 25 Wh | 90 000 |
| 50 Wh | 180 000 |
| 100 Wh | 360 000 |
| 250 Wh | 900 000 |
| 500 Wh | 1 800 000 |
| 1000 Wh | 3 600 000 |
Frequently asked
How many watt-hours are in a joule?
One joule equals 0.0002777777778 watt-hours (J → Wh). That figure is exact, not rounded.
How do you convert joules to watt-hours?
Multiply the number of joules by 0.000277777777778 to get watt-hours.
What is 1 Wh in joules?
One watt-hour is 3600 joules.
What is 10 J in Wh?
10 J = 0.002 777 777 8 Wh.