British thermal units (BTU) to Kilocalories (kcal) Conversion
British thermal units
The British thermal unit (BTU) is a unit of energy approximately equal to 1,055.06 joules, defined as the energy required to raise the temperature of one pound of water by one degree Fahrenheit. It remains the standard unit for heating and cooling capacity in HVAC systems in the United States: air conditioners and furnaces are rated in BTU/hour. A typical residential air conditioner is rated at 5,000–24,000 BTU/h. One BTU equals approximately 0.000293 kWh.
Kilocalories
The kilocalorie (kcal), commonly called a "Calorie" (capital C) in nutritional contexts, is a unit of energy equal to exactly 4,184 joules. It represents the energy needed to raise 1 kg of water by 1 °C. In nutrition, all food energy values are expressed in kcal per gram: carbohydrates and protein provide 4 kcal/g; fat provides 9 kcal/g; alcohol provides 7 kcal/g. An average adult requires approximately 2,000–2,500 kcal per day to maintain body weight.
| British thermal units (BTU) | Kilocalories (kcal) |
|---|---|
| 0.1 BTU | 0.0252 kcal |
| 1 BTU | 0.2522 kcal |
| 2 BTU | 0.5043 kcal |
| 3 BTU | 0.7565 kcal |
| 5 BTU | 1.2608 kcal |
| 10 BTU | 2.5216 kcal |
| 20 BTU | 5.0433 kcal |
| 30 BTU | 7.5649 kcal |
| 50 BTU | 12.6082 kcal |
| 100 BTU | 25.2164 kcal |
| 1000 BTU | 252.1644 kcal |
Frequently Asked Questions (FAQ)
How many kilocalories are in 1 British thermal units?
1 British thermal units (BTU) is exactly 0.252164 kilocalories (kcal).
How do I convert British thermal units to kilocalories?
Multiply the value in British thermal units by 0.252164 to get the result in kilocalories. Or use the converter above — type any number and see the result instantly.