How to convert BTU to calories
To convert BTU to calories, multiply the value by the conversion factor 252.1644007. To go the other way, multiply by 0.0039656668 (or divide by 252.1644007).
Worked example: 25 BTU to cal
- Write the value: 25 BTU
- Multiply by 252.1644007: 25 × 252.1644007
- Result: 6,304.11 cal
BTU to Calorie conversion table
Quick reference values, rounded to 6 significant digits.
| BTU (BTU) | Calorie (cal) |
|---|---|
| 0.1 BTU | 25.2164 cal |
| 0.25 BTU | 63.0411 cal |
| 0.5 BTU | 126.082 cal |
| 1 BTU | 252.164 cal |
| 2 BTU | 504.329 cal |
| 3 BTU | 756.493 cal |
| 4 BTU | 1,008.66 cal |
| 5 BTU | 1,260.82 cal |
| 6 BTU | 1,512.99 cal |
| 7 BTU | 1,765.15 cal |
| 8 BTU | 2,017.32 cal |
| 9 BTU | 2,269.48 cal |
| 10 BTU | 2,521.64 cal |
| 12 BTU | 3,025.97 cal |
| 15 BTU | 3,782.47 cal |
| 20 BTU | 5,043.29 cal |
| 25 BTU | 6,304.11 cal |
| 30 BTU | 7,564.93 cal |
| 40 BTU | 10,086.58 cal |
| 50 BTU | 12,608.22 cal |
| 75 BTU | 18,912.33 cal |
| 100 BTU | 25,216.44 cal |
| 250 BTU | 63,041.1 cal |
| 500 BTU | 126,082 cal |
| 1,000 BTU | 252,164 cal |
Calorie to BTU
| cal | BTU |
|---|---|
| 1 cal | 0.00396567 BTU |
| 5 cal | 0.0198283 BTU |
| 10 cal | 0.0396567 BTU |
| 50 cal | 0.198283 BTU |
| 100 cal | 0.396567 BTU |
1 BTU in other energy units
About BTU and Calorie
What is a btu (BTU)?
A British Thermal Unit is the energy to heat one pound of water by 1 °F.
What is a calorie (cal)?
A small calorie is the energy to raise 1 g of water by 1 °C (4.184 J).
Where btu to calorie conversion is used
Energy conversions are needed for electricity bills, food calories, heating, batteries and physics. Converting between BTU and calories is especially common when you compare products, read foreign specifications, or fill in forms that expect a specific unit.
Need every unit at once? Use the full Energy Converter.
Frequently asked questions
How many calories are in 1 btu?
1 BTU equals 252.164 cal.
How do I convert BTU to calories?
Multiply the number of BTU by 252.1644007. For example, 25 BTU × 252.1644007 = 6,304.11 cal.
What is 25 BTU in cal?
25 BTU = 6,304.11 cal.
How many BTU are in 1 calorie?
1 Calorie equals 0.00396567 BTU. Use the Calories to BTU converter for the reverse direction.
Is this BTU to Calorie converter accurate?
Yes. It uses exact internationally defined conversion factors, calculated with full floating-point precision. Results are displayed rounded for readability.