Joules to Kilowatt-hours
Type a value in Joules and get the result in Kilowatt-hours, calculated exactly.
100 Joules ≈ 0.000027777778 Kilowatt-hours
Precision
Exact factorRounded for display to about 10 significant digits.
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Formula
kWh = J ÷ 3,600,000
To convert Joules to Kilowatt-hours, divide the value by 3,600,000.
Worked examples
- 1 J ÷ 3,600,000 ≈ 0.000000277778 kWh
- 100 J ÷ 3,600,000 ≈ 0.000027777778 kWh
- 50 J ÷ 3,600,000 ≈ 0.000013888889 kWh
This factor is exact by definition.
Conversion table
| Joules (J) | Kilowatt-hours (kWh) |
|---|---|
| 1 | ≈ 0.000000277778 |
| 2 | ≈ 0.000000555556 |
| 3 | ≈ 0.000000833333 |
| 4 | ≈ 0.000001111111 |
| 5 | ≈ 0.000001388889 |
| 6 | ≈ 0.000001666667 |
| 7 | ≈ 0.000001944444 |
| 8 | ≈ 0.000002222222 |
| 9 | 0.0000025 |
| 10 | ≈ 0.000002777778 |
| 15 | ≈ 0.000004166667 |
| 20 | ≈ 0.000005555556 |
| 25 | ≈ 0.000006944444 |
| 30 | ≈ 0.000008333333 |
| 40 | ≈ 0.00001111111 |
| 50 | ≈ 0.00001388889 |
| 60 | ≈ 0.00001666667 |
| 70 | ≈ 0.00001944444 |
| 75 | ≈ 0.00002083333 |
| 80 | ≈ 0.00002222222 |
| 90 | 0.000025 |
| 100 | ≈ 0.00002777778 |
Values marked ≈ are rounded; the rest are exact.
Reverse table: Kilowatt-hours to Joules
| Kilowatt-hours (kWh) | Joules (J) |
|---|---|
| 1 | 3,600,000 |
| 2 | 7,200,000 |
| 3 | 10,800,000 |
| 4 | 14,400,000 |
| 5 | 18,000,000 |
| 6 | 21,600,000 |
| 7 | 25,200,000 |
| 8 | 28,800,000 |
| 9 | 32,400,000 |
| 10 | 36,000,000 |
| 15 | 54,000,000 |
| 20 | 72,000,000 |
| 25 | 90,000,000 |
| 30 | 108,000,000 |
| 40 | 144,000,000 |
| 50 | 180,000,000 |
| 60 | 216,000,000 |
| 70 | 252,000,000 |
| 75 | 270,000,000 |
| 80 | 288,000,000 |
| 90 | 324,000,000 |
| 100 | 360,000,000 |
Unit definitions
- Joules J
- The SI unit of energy: one newton acting over one metre, or one watt for one second.
- Kilowatt-hours kWh
- One kilowatt for one hour: exactly 3.6 megajoules; the unit on electricity bills.
Questions people ask
Joules to Kilowatt-hours: what is the conversion factor?
One J is ≈ 0.000000277778 kWh.
How do I convert Joules to Kilowatt-hours?
Use the formula above. For example, 100 J = ≈ 0.000027777778 kWh.
Is the conversion exact?
Yes. Both units have exact definitions, so the factor is exact; a result is only rounded when its decimals never end.
Factors checked 19 October 2026.