How to convert kilojoules to BTU
To convert kilojoules to BTU, multiply the value by the conversion factor 0.9478171203. To go the other way, multiply by 1.055055853 (or divide by 0.9478171203).
Worked example: 25 kJ to BTU
- Write the value: 25 kJ
- Multiply by 0.9478171203: 25 × 0.9478171203
- Result: 23.6954 BTU
Kilojoule to BTU conversion table
Quick reference values, rounded to 6 significant digits.
| Kilojoule (kJ) | BTU (BTU) |
|---|---|
| 0.1 kJ | 0.0947817 BTU |
| 0.25 kJ | 0.236954 BTU |
| 0.5 kJ | 0.473909 BTU |
| 1 kJ | 0.947817 BTU |
| 2 kJ | 1.89563 BTU |
| 3 kJ | 2.84345 BTU |
| 4 kJ | 3.79127 BTU |
| 5 kJ | 4.73909 BTU |
| 6 kJ | 5.6869 BTU |
| 7 kJ | 6.63472 BTU |
| 8 kJ | 7.58254 BTU |
| 9 kJ | 8.53035 BTU |
| 10 kJ | 9.47817 BTU |
| 12 kJ | 11.3738 BTU |
| 15 kJ | 14.2173 BTU |
| 20 kJ | 18.9563 BTU |
| 25 kJ | 23.6954 BTU |
| 30 kJ | 28.4345 BTU |
| 40 kJ | 37.9127 BTU |
| 50 kJ | 47.3909 BTU |
| 75 kJ | 71.0863 BTU |
| 100 kJ | 94.7817 BTU |
| 250 kJ | 236.954 BTU |
| 500 kJ | 473.909 BTU |
| 1,000 kJ | 947.817 BTU |
BTU to Kilojoule
| BTU | kJ |
|---|---|
| 1 BTU | 1.05506 kJ |
| 5 BTU | 5.27528 kJ |
| 10 BTU | 10.5506 kJ |
| 50 BTU | 52.7528 kJ |
| 100 BTU | 105.506 kJ |
1 Kilojoule in other energy units
About Kilojoule and BTU
What is a kilojoule (kJ)?
A kilojoule equals 1,000 joules, used on food labels.
What is a btu (BTU)?
A British Thermal Unit is the energy to heat one pound of water by 1 °F.
Where kilojoule to btu conversion is used
Energy conversions are needed for electricity bills, food calories, heating, batteries and physics. Converting between kilojoules and BTU is especially common when you compare products, read foreign specifications, or fill in forms that expect a specific unit.
Need every unit at once? Use the full Energy Converter.
Frequently asked questions
How many BTU are in 1 kilojoule?
1 Kilojoule equals 0.947817 BTU.
How do I convert kilojoules to BTU?
Multiply the number of kilojoules by 0.9478171203. For example, 25 kJ × 0.9478171203 = 23.6954 BTU.
What is 25 kJ in BTU?
25 kJ = 23.6954 BTU.
How many kilojoules are in 1 btu?
1 BTU equals 1.05506 kJ. Use the BTU to kJ converter for the reverse direction.
Is this Kilojoule to BTU converter accurate?
Yes. It uses exact internationally defined conversion factors, calculated with full floating-point precision. Results are displayed rounded for readability.