How to Convert Kilocalories to British thermal units (kcal to BTU)
Energy conversions link food labels in kJ and kcal, SP Group bills in kWh and air-conditioner capacity in BTU. This guide shows how to convert kilocalories into british thermal units by hand, with examples and a quick-reference table.
The conversion
To convert kilocalories to british thermal units, multiply the value by 3.9656668412. To go the other way, divide by the same number (or multiply by 0.2521644001). For a quick estimate, multiply by about 4.
British thermal units = kilocalories × 3.9656668412
Worked examples
- 3 kcal = 11.897 BTU
- 12.5 kcal = 49.5708 BTU
- 75 kcal = 297.425 BTU
Kilocalories to British thermal units table
| Kilocalories | British thermal units |
|---|---|
| 1 kcal | 3.9657 BTU |
| 2 kcal | 7.9313 BTU |
| 5 kcal | 19.8283 BTU |
| 10 kcal | 39.6567 BTU |
| 20 kcal | 79.3133 BTU |
| 25 kcal | 99.1417 BTU |
| 50 kcal | 198.2833 BTU |
| 100 kcal | 396.5667 BTU |
| 250 kcal | 991.4167 BTU |
| 500 kcal | 1,982.83 BTU |
| 1,000 kcal | 3,965.67 BTU |
Common questions
Is kcal to BTU exact?
The factors used here are the internationally defined values where they exist; results are rounded for display only.
How do I convert back?
Use the British thermal units to Kilocalories converter.
Mistakes to avoid
Multiplying when you should divide
Converting to a smaller unit gives a bigger number, and converting to a larger unit gives a smaller one. If your answer moves the wrong way, you have inverted the factor.
Forgetting squared and cubed units
Area and volume factors are the length factor squared or cubed, so 1 m² is about 10.76 sq ft, not 3.28.
Rounding the factor too early
Using 3 instead of 3.28 for feet per metre introduces an error of almost 9% before you have started.
Background
Singapore adopted the metric system in the 1970s, replacing imperial units and traditional Chinese measures in most official uses. Metric units are now standard in schools, trade and government, but older units survive in property, markets and imported goods.
Many conversion factors are exact by definition. The inch has been defined as exactly 2.54 centimetres since 1959, and the pound as exactly 0.45359237 kilograms, so conversions involving them can be as precise as you need.
Writing the units next to every number while you work is the simplest way to avoid mistakes. If the units do not cancel to leave the one you want, the calculation is set up wrongly.
For any value, use the Kilocalories to British thermal units Converter or browse all energy converters.
Run your own numbers: Kilocalories to British thermal units Converter