British thermal units to kilocalories
Type a value in British thermal units to see it in kilocalories straight away, or type in the second box to convert back.
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Processing and privacy: The result is calculated inside your browser and your data is not sent to any server.
How to use it
- Type the value in the British thermal units box.
- Read the result in kilocalories as you type, and pick the precision you need.
- Swap the direction to convert back, or copy the result.
How it is calculated
kcal = BTU × 0.2521644007
Multiply the value in British thermal units by 0.2521644007 to get kilocalories.
Example
To convert 25 BTU to kilocalories: 25 × 0.2521644007 = 6.30411 kcal.
Conversion table
| British thermal units (BTU) | Kilocalories (kcal) |
|---|---|
| 1 | 0.252164 |
| 2 | 0.504329 |
| 3 | 0.756493 |
| 5 | 1.26082 |
| 10 | 2.52164 |
| 20 | 5.04329 |
| 25 | 6.30411 |
| 50 | 12.6082 |
| 100 | 25.2164 |
| 250 | 63.0411 |
| 500 | 126.082 |
| 1,000 | 252.164 |
About the units
- British thermal unit
- The imperial unit of heat, using the International Table definition of exactly 1055.05585262 joules. Seen in air conditioner and heater ratings.
- Kilocalorie
- Equal to 1000 thermochemical calories, exactly 4184 joules. This is the everyday food calorie.
Limits and caveats
- Results are rounded for display and computed with the browser's floating point precision (about 15 significant digits).
- Both unit factors are exact by their official definitions.
Questions about this tool
How many kilocalories are in one British thermal unit?
1 BTU = 0.252164 kcal exactly.
How do I convert British thermal units to kilocalories?
Use kcal = BTU × 0.2521644007. For example, 25 BTU = 6.30411 kcal.
How many British thermal units are in one kilocalorie?
1 kcal = 3.96567 BTU.
Which calorie do these converters use?
The thermochemical calorie, exactly 4.184 joules, the factor many countries use to turn kcal into kJ on food labels. The International Table calorie is 4.1868 joules, less than 0.07% larger.
What is the difference between kW and kWh?
A kilowatt is a unit of power, the rate of using energy, while a kilowatt-hour is an amount of energy. A 2 kW heater running for three hours uses 6 kWh.