BTU to Kilojoule Converter
Convert BTU to kilojoule instantly.
Standard energy units
joule 105506
kilojoule 105.506
calorie 25216.539
kilocalorie 25.217
watt-hour 29.307
kilowatt-hour 0.0293
Fun comparisons
apples eaten 🍎~ 0.3
hours of 100W bulb 💡~ 0.29
marathons run 🏃~ 0.04
full car tanks of fuel ⛽~ Less than 0.01
How to convert btu to kilojoule
Enter your energy value in btu and see the result in kilojoule instantly. Key reference points: 1 food Calorie equals 1 kcal (4.184 kJ), and 1 kilowatt-hour equals 3600 kJ (860 kcal).
BTU is the US standard for heating and cooling capacity; kilojoule is the metric equivalent used in science and nutrition. One BTU equals approximately 1.055 kilojoules.
Need the opposite direction? Convert kilojoule to btu just as easily, or explore all our energy conversions.
Common BTU to kilojoule conversions
| BTU (BTU) | Kilojoule (kJ) |
|---|---|
| 1 | 1.05506 |
| 5 | 5.2753 |
| 10 | 10.5506 |
| 25 | 26.3765 |
| 50 | 52.753 |
| 100 | 105.506 |
| 500 | 527.53 |
| 1000 | 1055.06 |
Frequently asked questions
1 BTU equals 1.05506 kilojoule.
Multiply by 1.05506. For example, 5 BTU = 5.2753 kJ.
1000 BTU equals approximately 1055 kilojoules.
1 kilojoule equals 0.947813 BTU.
100 BTU equals 105.506 kilojoule.