Watt-hours to kilojoules converter
Convert watt-hours to kilojoules with an editable calculator, worked example, formula and reference table. Check the unit definitions before you convert.
Updated · How we checkUse a decimal point, such as 2.5. Enter a value in Wh; the result is in kJ.
Formula
Worked example
Convert 100 Wh to kJ:
100 Wh ≈ 360 kJ
Multiply your Wh value by the factor above. The calculator uses the full conversion factor before rounding the displayed answer.
Watt-hours to kilojoules table
Reference values rounded to 10 significant digits. Use the converter above for other amounts.
| Watt-hours (Wh) | Kilojoules (kJ) |
|---|---|
| 0.1 | ≈ 0.36 |
| 0.5 | ≈ 1.8 |
| 1 | ≈ 3.6 |
| 2 | ≈ 7.2 |
| 5 | ≈ 18 |
| 10 | ≈ 36 |
| 25 | ≈ 90 |
| 50 | ≈ 180 |
| 100 | ≈ 360 |
| 1000 | ≈ 3,600 |
Understanding watt-hours
One watt-hour equals 3,600 joules. It is the energy transferred by one watt over one hour. Battery energy estimates also depend on usable capacity and losses.
Understanding kilojoules
One kilojoule equals 1,000 joules. When comparing calorie-based values, confirm the calorie definition and distinguish a small calorie from a kilocalorie.
Precision and rounding
The calculator keeps decimal precision during the conversion. Displayed values use up to 10 significant digits; an approximation sign marks the reference results. Keep extra digits until your final measurement or purchase decision.
References
Definitions and method references. Example rates and prices on this page are editable assumptions.