Table Of Contents
British thermal units to kilocalories Conversion
1 British thermal units (BTU) is equal to 0.2521644007 kilocalories (kcal).
1 BTU = 0.2521644007 kcal
or
1 kcal = 3.965666831 BTU
Formula
To convert a energy from British thermal units (BTU) to kilocalories (kcal), divide the energy in British thermal units by 3.965666831
e(kcal) = e(BTU) / 3.965666831
Examples:
Convert 100 British thermal units to kilocalories:
e(kcal) = 100BTU / 3.965666831 = 25.21644007 kcal
Conversion table
| British thermal units (BTU) | Kilocalories (kcal) |
|---|---|
| 1 BTU | 0.252164401 kcal |
| 2 BTU | 0.504328801 kcal |
| 3 BTU | 0.756493202 kcal |
| 5 BTU | 1.260822004 kcal |
| 10 BTU | 2.521644007 kcal |
| 20 BTU | 5.043288014 kcal |
| 25 BTU | 6.304110018 kcal |
| 50 BTU | 12.608220036 kcal |
| 100 BTU | 25.216440072 kcal |
| 250 BTU | 63.04110018 kcal |
| 500 BTU | 126.082200361 kcal |
| 1000 BTU | 252.164400722 kcal |
| Kilocalories (kcal) | British thermal units (BTU) |
|---|---|
| 1 kcal | 3.965666831 BTU |
| 2 kcal | 7.931333663 BTU |
| 3 kcal | 11.897000494 BTU |
| 5 kcal | 19.828334157 BTU |
| 10 kcal | 39.656668314 BTU |
| 20 kcal | 79.313336628 BTU |
| 25 kcal | 99.141670785 BTU |
| 50 kcal | 198.28334157 BTU |
| 100 kcal | 396.566683139 BTU |
| 250 kcal | 991.416707848 BTU |
| 500 kcal | 1982.833415695 BTU |
| 1000 kcal | 3965.666831391 BTU |
Frequently asked questions
How do I convert British thermal units to kilocalories?
Divide the value in British thermal units by 3.965666831 to get the result in kilocalories. For example, 5 BTU ÷ 3.965666831 = 1.260822004 kcal.
How many kilocalories are in 1 British thermal units?
1 British thermal units (BTU) is equal to 0.252164401 kilocalories (kcal).
How do I convert kilocalories back to British thermal units?
Use the inverse operation: multiply the value in kilocalories by 3.965666831 to get the result in British thermal units.
How accurate is the British thermal units to kilocalories conversion?
The converter multiplies by the conversion factor 3.965666831 and rounds the result to 9 decimal places by default. You can increase or reduce the precision with the digits option on this page.
Sources
Conversion factors are based on internationally recognised standards:
- BIPM — The International System of Units (SI Brochure, 9th edition)
- NIST Guide to the SI, Appendix B.8: Factors for Units Listed Alphabetically (NIST SP 811, 2008 edition)
- NIST Guide to the SI (SP 811), Footnotes (notes 22 and 23)
- CODATA Value: electron volt-joule relationship (NIST Fundamental Physical Constants)
