How to convert kilocalories to British thermal units
BTU = kcal × 3.965666831Multiply the value in kilocalories by 3.965666831. To go the other way, multiply by 0.2521644007 (or divide by 3.965666831).
A kilocalorie is larger than a British thermal unit: one kilocalorie contains 3.965666831 British thermal units.
Worked examples
- 1 kilocalorie (food Calorie)1 kcal × 3.965666831 = 3.965666831 BTU
- 5 kilocalories5 kcal × 3.965666831 = 19.82833416 BTU
- 10 kilocalories10 kcal × 3.965666831 = 39.65666831 BTU
- 20 kilocalories20 kcal × 3.965666831 = 79.31333663 BTU
- 100 kilocalories100 kcal × 3.965666831 = 396.5666831 BTU
Kilocalories to British thermal units conversion table
Values are calculated by the conversion engine and rounded to 8 significant figures.
| Kilocalories (kcal) | British thermal units (BTU) |
|---|---|
| 0.1 kcal | 0.39656668 BTU |
| 0.25 kcal | 0.99141671 BTU |
| 0.5 kcal | 1.9828334 BTU |
| 1 kcal | 3.9656668 BTU |
| 2 kcal | 7.9313337 BTU |
| 3 kcal | 11.897 BTU |
| 4 kcal | 15.862667 BTU |
| 5 kcal | 19.828334 BTU |
| 6 kcal | 23.794001 BTU |
| 7 kcal | 27.759668 BTU |
| 8 kcal | 31.725335 BTU |
| 9 kcal | 35.691001 BTU |
| 10 kcal | 39.656668 BTU |
| Kilocalories (kcal) | British thermal units (BTU) |
|---|---|
| 12 kcal | 47.588002 BTU |
| 15 kcal | 59.485002 BTU |
| 20 kcal | 79.313337 BTU |
| 25 kcal | 99.141671 BTU |
| 30 kcal | 118.97 BTU |
| 40 kcal | 158.62667 BTU |
| 50 kcal | 198.28334 BTU |
| 75 kcal | 297.42501 BTU |
| 100 kcal | 396.56668 BTU |
| 250 kcal | 991.41671 BTU |
| 500 kcal | 1,982.8334 BTU |
| 1,000 kcal | 3,965.6668 BTU |
About the units
Kilocalorie (kcal)
One thousand small calories, or 4,184 J. The “Calories” on nutrition labels are kilocalories.
British thermal unit (BTU)
The International Table BTU, 1,055.05585262 J — roughly the energy to heat one pound of water by 1 °F. Furnace and AC capacities are rated in BTU (per hour). One British thermal unit equals 1,055.055853 joules (J).
Frequently asked questions
How many British thermal units are in one kilocalorie?
There are 3.965666831 British thermal units in one kilocalorie, and this value is exact by definition.
How do I convert kilocalories to British thermal units?
Multiply the number of kilocalories by 3.965666831. For example, 10 kcal × 3.965666831 = 39.65666831 BTU.
How many kilocalories are in one British thermal unit?
One British thermal unit equals 0.2521644007 kilocalories. That is the reverse factor, 1 ÷ 3.965666831.
What is 10 kilocalories in British thermal units?
10 kcal = 39.65666831 BTU.
Is this kcal to BTU converter accurate?
Yes. Both units are defined exactly in terms of SI units, so the conversion factor is exact; results are shown to 12 significant figures by default and you can change precision in the converter. Calculations run in your browser using the same tested engine that generated this page.