Calories to British thermal units converter
British thermal units (BTU)
1 calorie = 0.003965666831 British thermal units
How to convert calories to British thermal units
BTU = cal × 0.00396566683139
Multiply the number of calories by 0.00396566683139 to get British thermal units. Going the other way, divide by 0.00396566683139 (or multiply by 252.164400722).
One calorie is exactly defined as 0.00396566683139 British thermal units (to 12 significant figures), and one British thermal unit is 252.164400722 calories.
Worked examples
- Convert 5 calories: 5 × 0.00396566683139 = 0.01982833416 0.01982833416 British thermal units.
- Convert 12.5 calories: 12.5 × 0.00396566683139 = 0.04957083539 0.04957083539 British thermal units.
- Convert 250 calories: 250 × 0.00396566683139 = 0.9914167078 0.9914167078 British thermal units.
Quick-reference table
| cal | BTU |
|---|---|
| 1 | 0.003965666831 |
| 2 | 0.007931333663 |
| 3 | 0.01189700049 |
| 5 | 0.01982833416 |
| 10 | 0.03965666831 |
| 15 | 0.05948500247 |
| 20 | 0.07931333663 |
| 25 | 0.09914167078 |
| 50 | 0.1982833416 |
| 75 | 0.2974250124 |
| 100 | 0.3965666831 |
| 1,000 | 3.965666831 |
| BTU | cal |
|---|---|
| 1 | 252.1644007 |
| 2 | 504.3288014 |
| 3 | 756.4932022 |
| 5 | 1,260.822004 |
| 10 | 2,521.644007 |
| 15 | 3,782.466011 |
| 20 | 5,043.288014 |
| 25 | 6,304.110018 |
| 50 | 12,608.22004 |
| 75 | 18,912.33005 |
| 100 | 25,216.44007 |
| 1,000 | 252,164.4007 |
Related conversions
Frequently asked questions
How many British thermal units are in 1 calorie?
1 calorie equals 0.003965666831 British thermal units.
What is the formula to convert calories to British thermal units?
Use BTU = cal × 0.00396566683139. Multiply the number of calories by 0.00396566683139 to get British thermal units. Going the other way, divide by 0.00396566683139 (or multiply by 252.164400722).
What is 100 calories in British thermal units?
100 calories is 0.3965666831 British thermal units.