BTU to Calories
Convert btu to calories instantly. 1 BTU = 252.1644007218 cal. Includes the exact factor, a conversion table of common values and the definition of both units.
How to convert btu to calories
To convert btu to calories, multiply by 252.1644007218. The relationship is fixed, so the same factor works for any quantity — there is nothing to look up and nothing that changes with temperature, location or context.
cal = BTU × 252.1644007218
BTU to Calories conversion table
The values people look up most often, rounded for reading. Use the calculator above for anything in between.
| BTU | Calories |
|---|---|
| 1 BTU | 252.164401 cal |
| 2 BTU | 504.328801 cal |
| 3 BTU | 756.493202 cal |
| 5 BTU | 1,260.82 cal |
| 10 BTU | 2,521.64 cal |
| 20 BTU | 5,043.29 cal |
| 25 BTU | 6,304.11 cal |
| 50 BTU | 12,608.22 cal |
| 100 BTU | 25,216.44 cal |
| 500 BTU | 126,082.2 cal |
| 1,000 BTU | 252,164.4 cal |
What is a btu?
British thermal unit, used for heating and air-conditioning capacity.
What is a calory?
The small calorie: energy to raise one gram of water by one degree.
The formula
cal = BTU × 252.1644007218
Every result on this page comes from this formula. Nothing is rounded until the final display, so figures match a spreadsheet to the cent.
How to use the BTU to Calories
- Type the number of btu you want to convert.
- Read the result in calories straight away — there is no button to press.
- Check the table below for the values that come up most often, or reverse the conversion with the linked calories to btu page.
BTU to Calories — frequently asked questions
How many calories are in a btu?
One btu equals 252.1644007218 cal. cal = BTU × 252.1644007218
What is the formula to convert btu to calories?
The formula is cal = BTU × 252.1644007218. It is an exact definition rather than an approximation, so the conversion never drifts no matter how large the number.
How do I convert calories back to btu?
Divide instead of multiplying: one calory is 0.0039656668 BTU. The reverse converter is linked in the related tools list.
Is this conversion exact?
Yes. Both units are defined against the same base unit by international agreement, so the factor is exact — any rounding you see is only in the display, which you can widen by entering more decimal places.
Is this btu to calories free to use?
Yes. Every calculator on the site is free, needs no sign-up, and runs entirely in your browser, so your figures never leave your device.
What people search for
This page answers each of these searches. They are the exact phrases visitors use to find the btu to calories.
- btu to calories
- 1 btu to calories
- how many calories in a btu
- btu2cal
- btu in calories
- btu to calories converter
- convert btu to calories
About this calculator
Written and reviewed by The Samsung Calculator editorial team. Every calculator is written against a published formula, reviewed against at least one independent reference implementation, and dated when it changes.
Last reviewed August 19, 2026 · Calculation runs client-side · No data collected · Report an error