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Kilojoules to Kilowatt-hours (kJ to kWh)
Convert kilojoules to kilowatt-hours: 1 kJ = 0.000277778 kWh. Exact conversion factor, formula, 22-row table and worked examples, with JSON API and MCP access.
Formula
1 kJ = 0.000277778 kWh
kilowatt-hours = kilojoules × 0.0002777777778 — reverse: kilojoules = kilowatt-hours × 3600
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 kJ = 0.00138889 kWh
- 12.5 kJ = 0.00347222 kWh
- 100 kJ = 0.0277778 kWh
Kilojoules to kilowatt-hours conversion table
| Kilojoules (kJ) | Kilowatt-hours (kWh) |
|---|---|
| 1 | 0.000277778 |
| 2 | 0.000555556 |
| 3 | 0.000833333 |
| 4 | 0.00111111 |
| 5 | 0.00138889 |
| 6 | 0.00166667 |
| 7 | 0.00194444 |
| 8 | 0.00222222 |
| 9 | 0.0025 |
| 10 | 0.00277778 |
| 15 | 0.00416667 |
| 20 | 0.00555556 |
| 25 | 0.00694444 |
| 30 | 0.00833333 |
| 40 | 0.0111111 |
| 50 | 0.0138889 |
| 75 | 0.0208333 |
| 100 | 0.0277778 |
| 200 | 0.0555556 |
| 250 | 0.0694444 |
| 500 | 0.138889 |
| 1000 | 0.277778 |
FAQ
How many kilowatt-hours are in one kilojoule?
1 kJ = 0.000277778 kWh. 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 kilojoules to kilowatt-hours?
Multiply the value in kilojoules by 0.0002777777778: kilowatt-hours = kilojoules × 0.0002777777778. For example, 5 kJ = 0.00138889 kWh.
How do I convert kilowatt-hours back to kilojoules?
Multiply by the inverse factor 3600 (kilojoules = kilowatt-hours × 3600), or use the kilowatt-hours-to-kilojoules page.
Related conversions
- Kilowatt-hours to kilojoules (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=kJ&to_unit=kWh - MCP: server
https://tttkmbb.com/mcp, toolconvert_unitswith{"value":5,"from_unit":"kJ","to_unit":"kWh"} - Markdown: https://tttkmbb.com/conversion/kj-to-kwh.md · JSON: https://tttkmbb.com/conversion/kj-to-kwh.json (add
?value=for a result) · Units: /api/v1/units?quantity=energy - OpenAPI operationId:
convert_units. Freshness:static. Authentication: none.