Convert calories to BTU
1 cal = 0.00396567 BTU. Change the amount below, or read the formula and the reference table further down.
1 calorie equals
BTU
1 cal = 0.00396567 BTU
The formula
Calories and BTU both measure energy from the same zero, so a single multiplier does the job.
BTU = cal × 0.0039656668
Going the other way? Convert BTU to calories.
Calories to BTU table
Common values, rounded for reading.
| Calories (cal) | BTU (BTU) |
|---|---|
| 1 | 0.003966 |
| 2 | 0.007931 |
| 3 | 0.011897 |
| 4 | 0.015863 |
| 5 | 0.019828 |
| 6 | 0.023794 |
| 7 | 0.02776 |
| 8 | 0.031725 |
| 9 | 0.035691 |
| 10 | 0.039657 |
| 15 | 0.059485 |
| 20 | 0.079313 |
| 25 | 0.099142 |
| 30 | 0.11897 |
| 40 | 0.158627 |
| 50 | 0.198283 |
| 75 | 0.297425 |
| 100 | 0.396567 |
| 250 | 0.991417 |
| 500 | 1.9828 |
| 1,000 | 3.9657 |
Questions people ask
- How many BTU are in a calorie?
- One calorie equals 0.0039656668 BTU.
- How do I convert calories to BTU by hand?
- Multiply the number of calories by 0.0039656668. For a rough check, 0.004 is close enough for most everyday use.
- What is 1 calorie in BTU?
- 1 calorie is 0.00396567 BTU.
Calcuit generates this page from a unit table, so the factors here match every other page on the site.