Kilojoules to Btus
A kilojoule is 1,000 joules, used on nutrition labels outside the US to state food energy content. A British Thermal Unit is the energy to raise 1 pound of water by 1°F, used to rate air conditioners and heaters in the US. 1 kJ equals ≈0.947817 BTU, 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
BTU = kJ × ≈0.947817
kJ = BTU × ≈1.05506
Worked example: 5 kJ × ≈0.947817 = ≈4.73909 BTU.
Conversion table
| Kilojoule (kJ) | BTU (BTU) |
|---|---|
| 1 kJ | ≈0.947817 BTU |
| 2 kJ | ≈1.89563 BTU |
| 3 kJ | ≈2.84345 BTU |
| 5 kJ | ≈4.73909 BTU |
| 10 kJ | ≈9.47817 BTU |
| 20 kJ | ≈18.9563 BTU |
| 25 kJ | ≈23.6954 BTU |
| 50 kJ | ≈47.3909 BTU |
| 100 kJ | ≈94.7817 BTU |
| 250 kJ | ≈236.954 BTU |
| 500 kJ | ≈473.909 BTU |
| 1,000 kJ | ≈947.817 BTU |
Frequently asked
- How many BTUs in a kilojoule?
- 1 kJ equals ≈0.947817 BTU.
- How do I convert Kilojoules to BTUs?
- Multiply the value in kJ by ≈0.947817 to get BTU. The converter above does this instantly as you type.
- Is the conversion exact?
- Yes — Kilojoule and BTU 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.