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Kilowatt-hours to Kilojoules (kWh to kJ)
Convert kilowatt-hours to kilojoules: 1 kWh = 3600 kJ. Exact conversion factor, formula, 22-row table and worked examples, with JSON API and MCP access.
Formula
1 kWh = 3600 kJ
kilojoules = kilowatt-hours × 3600 — reverse: kilowatt-hours = kilojoules × 0.0002777777778
The factor is derived from the SI definitions of both units (base unit: J) as listed in NIST SP 811; results on this page are shown to 6 significant figures, the API returns up to 12.
Worked examples
- 5 kWh = 18000 kJ
- 12.5 kWh = 45000 kJ
- 100 kWh = 360000 kJ
Kilowatt-hours to kilojoules conversion table
| Kilowatt-hours (kWh) | Kilojoules (kJ) |
|---|---|
| 1 | 3600 |
| 2 | 7200 |
| 3 | 10800 |
| 4 | 14400 |
| 5 | 18000 |
| 6 | 21600 |
| 7 | 25200 |
| 8 | 28800 |
| 9 | 32400 |
| 10 | 36000 |
| 15 | 54000 |
| 20 | 72000 |
| 25 | 90000 |
| 30 | 108000 |
| 40 | 144000 |
| 50 | 180000 |
| 75 | 270000 |
| 100 | 360000 |
| 200 | 720000 |
| 250 | 900000 |
| 500 | 1800000 |
| 1000 | 3600000 |
FAQ
How many kilojoules are in one kilowatt-hour?
1 kWh = 3600 kJ. The factor comes from the SI definitions of both units (NIST SP 811 / BIPM), so it is exact or correct to at least 10 significant figures.
What is the formula to convert kilowatt-hours to kilojoules?
Multiply the value in kilowatt-hours by 3600: kilojoules = kilowatt-hours × 3600. For example, 5 kWh = 18000 kJ.
How do I convert kilojoules back to kilowatt-hours?
Multiply by the inverse factor 0.0002777777778 (kilowatt-hours = kilojoules × 0.0002777777778), or use the kilojoules-to-kilowatt-hours page.
Related conversions
- Kilojoules to kilowatt-hours (reverse)
- Energy Converter — all energy units in one tool
- Kilocalories (food calories) to Kilojoules
- Kilojoules to Kilocalories (food calories)
- Joules to Calories (small, thermochemical)
- Calories (small, thermochemical) to Joules
- Kilowatt-hours to Megajoules
- Megajoules to Kilowatt-hours
- Kilowatt-hours to BTU
- BTU to Kilowatt-hours
Machine access
- API:
GET https://tttkmbb.com/api/v1/convert?value=5&from_unit=kWh&to_unit=kJ - MCP: server
https://tttkmbb.com/mcp, toolconvert_unitswith{"value":5,"from_unit":"kWh","to_unit":"kJ"} - Markdown: https://tttkmbb.com/conversion/kwh-to-kj.md · JSON: https://tttkmbb.com/conversion/kwh-to-kj.json (add
?value=for a result) · Units: /api/v1/units?quantity=energy - OpenAPI operationId:
convert_units. Freshness:static. Authentication: none.