Joules to Kilowatt Hours
The joule is the SI unit of energy, defined as the work done by one newton over one meter. A kilowatt-hour is 1,000 watt-hours, the unit electricity companies use to bill household power usage. 1 J equals 2.77778e-7 kWh, so converting between them is a matter of multiplying by that fixed factor — type any value into the converter below and both sides update instantly as you type.
Both units belong to energy, measured here against energy's base unit (J) — every other energy unit on this site converts through that same reference point, which is why the table below can also be read as a quick cross-check against nearby values.
Formula
kWh = J × 2.77778e-7
J = kWh × 3,600,000
Worked example: 5 J × 2.77778e-7 = ≈0.00000138889 kWh.
Conversion table
| Joule (J) | Kilowatt-hour (kWh) |
|---|---|
| 1 J | 2.77778e-7 kWh |
| 2 J | 5.55556e-7 kWh |
| 3 J | 8.33333e-7 kWh |
| 5 J | ≈0.00000138889 kWh |
| 10 J | ≈0.00000277778 kWh |
| 20 J | ≈0.00000555556 kWh |
| 25 J | ≈0.00000694444 kWh |
| 50 J | ≈0.0000138889 kWh |
| 100 J | ≈0.0000277778 kWh |
| 250 J | ≈0.0000694444 kWh |
| 500 J | ≈0.000138889 kWh |
| 1,000 J | ≈0.000277778 kWh |
Frequently asked
- How many Kilowatt-hours in a joule?
- 1 J equals 2.77778e-7 kWh.
- How do I convert Joules to Kilowatt-hours?
- Multiply the value in J by 2.77778e-7 to get kWh. The converter above does this instantly as you type.
- Is the conversion exact?
- Yes — Joule and Kilowatt-hour are both defined by a fixed conversion factor to energy's base unit (J), so the result shown is exact to the precision displayed, not an approximation.