Convert British Thermal Unit to Calorie
Use this free converter to change british thermal units (BTU) into calories (cal). British thermal unit and calorie both measure energy. As a quick reference, 1 BTU equals 252.1644 cal, and 1 cal equals 0.0039656668 BTU.
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Calorie (cal)
252.1644
1 BTU = 252.1644 cal
Energy conversion table
| British Thermal Unit | Calorie |
|---|---|
| 0.01 | 2.521644 |
| 0.1 | 25.21644 |
| 0.5 | 126.0822 |
| 1 | 252.1644 |
| 2 | 504.3288 |
| 3 | 756.4932 |
| 5 | 1260.822 |
| 10 | 2521.644 |
| 20 | 5043.288 |
| 25 | 6304.11 |
| 50 | 12608.22 |
| 100 | 25216.44 |
| 1,000 | 252164.4 |
How to convert British Thermal Unit to Calorie
Multiply the british thermal unit value by 252.1644 to get calories.
- Enter the number of british thermal units you want to convert.
- The converter instantly shows the equivalent value in calories.
- Worked example: 15 BTU × 252.1644 = 3782.466 cal.
- Use the swap button to reverse the conversion (calorie to british thermal unit).
About these units
British Thermal Unit (BTU)
- Definition
- A British thermal unit (BTU) is the energy needed to raise one pound of water by one degree Fahrenheit.
- History
- It developed with steam engineering in Britain and the United States.
- Current use
- BTUs rate heating, air-conditioning, and appliance energy in the US.
Calorie (cal)
- Definition
- A calorie (cal) is the energy needed to raise one gram of water by one degree Celsius, about 4.184 joules.
- History
- Defined in the 19th century, the small calorie was later joined by the larger food Calorie.
- Current use
- Calories appear in chemistry and, as kilocalories, in nutrition.
Frequently asked questions
How many calories are in a british thermal unit?
There are 252.1644 cal in 1 BTU. To convert, multiply the number of british thermal units by 252.1644.
How do I convert british thermal units to calories?
Multiply the british thermal unit value by 252.1644 to get calories. For example, 10 BTU = 2521.644 cal.
Is this british thermal unit-to-calorie converter free?
Yes. This converter is completely free, runs entirely in your browser, and requires no sign-up. Your inputs never leave your device.
Convert British Thermal Unit to other energy units
| Unit | 1 British Thermal Unit equals |
|---|---|
| Joule (J) | 1055.0558 J |
| Kilojoule (kJ) | 1.0550559 kJ |
| Calorie (cal) | 252.1644 cal |
| Kilocalorie (kcal) | 0.2521644 kcal |
| Watt Hour (Wh) | 0.29307107 Wh |
| Kilowatt Hour (kWh) | 0.00029307107 kWh |
| Electronvolt (eV) | 6.5851e+21 eV |
| Foot-Pound (ft·lb) | 778.16926 ft·lb |