Convert Joules to Kilowatt-hours
One joule equals 2.77778 × 10⁻⁷ kilowatt-hours. Type any value to convert joules to kilowatt-hours instantly — with a full reference table below.
Convert Joules to Kilowatt-hours
Converted in your browser — nothing you enter is sent anywhere.
How to convert Joules to Kilowatt-hours
To convert joules to kilowatt-hours, multiply by 2.77778 × 10⁻⁷. One joule equals 2.77778 × 10⁻⁷ kWh, and one kilowatt-hour equals 3,600,000 J.
- Take the value in joules — for example 7.5 J.
- Multiply by 2.77778 × 10⁻⁷ (the number of kilowatt-hours in one joule).
- 7.5 × 2.77778 × 10⁻⁷ = 0.0000020833 kWh.
Joules to Kilowatt-hours conversion table
| Joules | Kilowatt-hours |
|---|---|
| 1 J | 2.77778 × 10⁻⁷ kWh |
| 2 J | 5.55556 × 10⁻⁷ kWh |
| 5 J | 0.0000013889 kWh |
| 10 J | 0.0000027778 kWh |
| 20 J | 0.0000055556 kWh |
| 50 J | 0.0000138889 kWh |
| 100 J | 0.0000277778 kWh |
| 200 J | 0.0000555556 kWh |
| 500 J | 0.000138889 kWh |
| 1,000 J | 0.000277778 kWh |
| 2,000 J | 0.000555556 kWh |
| Kilowatt-hours | Joules |
|---|---|
| 1 kWh | 3,600,000 J |
| 2 kWh | 7,200,000 J |
| 5 kWh | 18,000,000 J |
| 10 kWh | 36,000,000 J |
| 20 kWh | 72,000,000 J |
| 50 kWh | 180,000,000 J |
| 100 kWh | 360,000,000 J |
| 200 kWh | 720,000,000 J |
| 500 kWh | 1,800,000,000 J |
| 1,000 kWh | 3,600,000,000 J |
| 2,000 kWh | 7,200,000,000 J |
About converting Joules to Kilowatt-hours
Joules (J) and Kilowatt-hours (kWh) are both units of energy. The exact factor is 1 J = 2.77778 × 10⁻⁷ kWh, so multiply by 2.77778 × 10⁻⁷ to go from joules to kilowatt-hours (or divide to go back).
The conversion runs entirely in your browser. Need the reverse? Use the Kilowatt-hours to Joules converter, or the full unit converter for every unit at once.
Real-world energy in joules and kilowatt-hours
| Example | Joules | Kilowatt-hours |
|---|---|---|
| One food Calorie (kcal) | 4,184 J | 0.00116222 kWh |
| A 100 W bulb running for one hour | 360,000 J | 0.1 kWh |
| A smartphone battery (≈19 Wh) | ≈ 69,300 J | ≈ 0.01925 kWh |
| A 2,000 kcal daily diet | 8,368,000 J | 2.324444 kWh |
| One kilowatt-hour | 3,600,000 J | 1 kWh |
“≈” marks typical values; the rest are defined or measured figures.
The units
The SI unit of energy: the work done by one newton over one metre.
Used for: Science and food labels (kJ).
1,000 watt-hours, exactly 3.6 MJ — the 'unit' on electricity bills.
Used for: Electricity bills and EV batteries.
The thermochemical calorie is exactly 4.184 J and a kilowatt-hour is exactly 3.6 MJ, so these factors are exact.