BTU to kilojoules
Convert btu to kilojoule — instant, free, with the formula shown.
1 BTU=1.055056 kJ
How to convert btu to kilojoule
To convert btu to kilojoule, multiply by 1.05505585:
kJ = BTU × 1.05505585
For example, 10 BTU × 1.055056 = 10.550559 kJ.
BTU to kJ conversion table
| BTU (BTU) | kilojoules (kJ) |
|---|---|
| 1 BTU | 1.055056 kJ |
| 2 BTU | 2.110112 kJ |
| 5 BTU | 5.275279 kJ |
| 10 BTU | 10.550558 kJ |
| 25 BTU | 26.376396 kJ |
| 50 BTU | 52.752792 kJ |
| 100 BTU | 105.505585 kJ |
| 250 BTU | 263.763962 kJ |
| 500 BTU | 527.527925 kJ |
| 1000 BTU | 1055.05585 kJ |
Other btu conversions
Convert to kilojoule from another unit
BTU to kJ — frequently asked
How many kilojoules are in 1 btu?
1 btu = 1.055056 kilojoules (BTU × 1.055056 = kJ).
What is the formula to convert btu to kilojoule?
Multiply your btu value by 1.05505585 to get kilojoule.
How do I convert 10 BTU to kilojoules?
10 BTU = 10.550558 kJ. For 100 BTU the answer is 105.505585 kJ. Use the calculator on this page for any other value.
When to convert btu to kilojoule
1Electricity bills (kWh)
2Nutrition labels (kcal / food cal)
3HVAC and heating (BTU, therms)
4Physics and chemistry (J, eV)
Energy conversion — common questions
Is a food calorie the same as a calorie?
No — a food 'Calorie' (capital C) actually means 1 kilocalorie = 1,000 small calories = 4,184 J. Nutrition labels typically write 'cal' meaning kcal.
How many joules in 1 kWh?
1 kWh = 3,600,000 J (3.6 MJ). Because 1 kW × 1 hour = 1,000 W × 3,600 s = 3,600,000 J.
What is a BTU?
British Thermal Unit — the energy required to raise 1 pound of water by 1 °F. 1 BTU ≈ 1,055 J.
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