Convert joule to watt-hour
1 J = 0.0002777777778 Wh
1 J = 0.000278 Wh
1 J in every energy unit
| joule | 1 J |
| kilojoule | 0.001 kJ |
| megajoule | 0.000001 MJ |
| calorie | 0.239 cal |
| kilocalorie | 0.000239 kcal |
| watt-hour | 0.000278 Wh |
| kilowatt-hour | 2.78e-07 kWh |
| British thermal unit | 0.000948 BTU |
| foot-pound | 0.738 ft⋅lb |
| electron volt | 6.24e+18 eV |
| kiloelectron volt | 6.24e+15 keV |
| megaelectron volt | 6,240,000,000,000 MeV |
How the conversion works
Multiply by 0.0002777777778 to go from joule to watt-hour, or divide by it to go back. Every conversion on this site routes through the SI value (J) rather than a table of pairwise factors, so a round-trip returns exactly what you started with.
Going the other way? watt-hour to joule — 1 Wh = 3,600 J.
joule to watt-hour — common values
| 1 J | 0.00027777778 Wh |
| 2 J | 0.00055555556 Wh |
| 3 J | 0.00083333333 Wh |
| 5 J | 0.0013888889 Wh |
| 10 J | 0.0027777778 Wh |
| 15 J | 0.0041666667 Wh |
| 20 J | 0.0055555556 Wh |
| 25 J | 0.0069444444 Wh |
| 50 J | 0.013888889 Wh |
| 75 J | 0.020833333 Wh |
| 100 J | 0.027777778 Wh |
| 250 J | 0.069444444 Wh |
| 500 J | 0.13888889 Wh |
| 1000 J | 0.27777778 Wh |