Calorie to British Thermal Unit Converter
Convert Calorie (cal) to British Thermal Unit (BTU) instantly with this energy converter. Use the calculator above, then check the formula, worked examples, table, and manual steps below.
Formula
BTU = cal × 0.003965666831
Multiply the Calorie value by 0.003965666831 to get the equivalent value in British Thermal Unit.
Example Conversions
1 Calorie (cal)
0.003965666831 British Thermal Unit (BTU)
5 Calorie (cal)
0.01982833416 British Thermal Unit (BTU)
10 Calorie (cal)
0.03965666831 British Thermal Unit (BTU)
25 Calorie (cal)
0.09914167078 British Thermal Unit (BTU)
100 Calorie (cal)
0.3965666831 British Thermal Unit (BTU)
Conversion Table
| Calorie (cal) | British Thermal Unit (BTU) |
|---|---|
| 0.1 | 0.0003965666831 |
| 0.5 | 0.001982833416 |
| 1 | 0.003965666831 |
| 2 | 0.007931333663 |
| 5 | 0.01982833416 |
| 10 | 0.03965666831 |
| 25 | 0.09914167078 |
| 50 | 0.1982833416 |
| 100 | 0.3965666831 |
| 250 | 0.9914167078 |
| 500 | 1.982833416 |
| 1000 | 3.965666831 |
How to Convert Manually
Use these steps to convert Calorie values to British Thermal Unit without the calculator.
- Write down the value in Calorie (cal) that you want to convert.
- Multiply that value by 0.003965666831.
- For example, 10 Calorie × 0.003965666831 = 0.03965666831 British Thermal Unit.
- Label the result as British Thermal Unit (BTU).
Relative Size Comparison
This chart shows the visual difference in size between exactly one Calorie and one British Thermal Unit.
About Calorie and British Thermal Unit
Converting Calorie to British Thermal Unit is common in energy applications, engineering, and everyday life. Whether you are translating specifications from international manuals, completing homework, or planning a project, having an accurate cal to BTU calculation ensures your measurements are correct.
The Calorie is a unit of energy. One Calorie equals 4.184 J in this converter's base scale.
The British Thermal Unit is also a energy unit. One British Thermal Unit equals 1055.055853 J in the same base scale.
Precision and Rounding: When converting Calorie to British Thermal Unit, you may encounter long decimal numbers. For most practical purposes, rounding to two or three decimal places is sufficient. However, for machining, scientific research, or strict engineering tolerances, you should maintain as much precision as possible before your final calculation.
Worked Example
15 Calorie equals 0.05948500247 British Thermal Unit.
15 cal × 0.003965666831 = 0.05948500247 BTU
FAQ
How do I convert Calorie to British Thermal Unit?
Multiply the Calorie value by 0.003965666831 to get the equivalent value in British Thermal Unit.
What is the formula for Calorie to British Thermal Unit?
The formula is BTU = cal × 0.003965666831.
How many British Thermal Unit are in 1 Calorie?
1 Calorie equals 0.003965666831 British Thermal Unit.
Can I convert British Thermal Unit back to Calorie?
Yes. 1 British Thermal Unit equals 252.1644007 Calorie, and the related converter can reverse the calculation.
What are common names for Calorie and British Thermal Unit?
Calorie is shown as cal and may also be searched as calorie, calories, small calorie. British Thermal Unit is shown as BTU and may also be searched as btu, british thermal unit.
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