British Thermal Units to Kilocalories (BTU → kcal)
Formula
1 BTU = 0.25216539196940724 kcalConversion Table
| BTU | kcal |
|---|---|
| 0 | 0 |
| 1.0000 | 0.25217 |
| 2.0000 | 0.50433 |
| 3.0000 | 0.75650 |
| 4.0000 | 1.0087 |
| 5.0000 | 1.2608 |
| 6.0000 | 1.5130 |
| 7.0000 | 1.7652 |
| 8.0000 | 2.0173 |
| 9.0000 | 2.2695 |
| 10.000 | 2.5217 |
| 11.000 | 2.7738 |
| 12.000 | 3.0260 |
| 13.000 | 3.2782 |
| 14.000 | 3.5303 |
| 15.000 | 3.7825 |
| 16.000 | 4.0346 |
| 17.000 | 4.2868 |
| 18.000 | 4.5390 |
| 19.000 | 4.7911 |
| BTU | kcal |
|---|---|
| 20.000 | 5.0433 |
| 21.000 | 5.2955 |
| 22.000 | 5.5476 |
| 23.000 | 5.7998 |
| 24.000 | 6.0520 |
| 25.000 | 6.3041 |
| 26.000 | 6.5563 |
| 27.000 | 6.8085 |
| 28.000 | 7.0606 |
| 29.000 | 7.3128 |
| 30.000 | 7.5650 |
| 31.000 | 7.8171 |
| 32.000 | 8.0693 |
| 33.000 | 8.3215 |
| 34.000 | 8.5736 |
| 35.000 | 8.8258 |
| 36.000 | 9.0780 |
| 37.000 | 9.3301 |
| 38.000 | 9.5823 |
| 39.000 | 9.8345 |
| BTU | kcal |
|---|---|
| 40.000 | 10.087 |
| 41.000 | 10.339 |
| 42.000 | 10.591 |
| 43.000 | 10.843 |
| 44.000 | 11.095 |
| 45.000 | 11.347 |
| 46.000 | 11.600 |
| 47.000 | 11.852 |
| 48.000 | 12.104 |
| 49.000 | 12.356 |
| 50.000 | 12.608 |
| 51.000 | 12.860 |
| 52.000 | 13.113 |
| 53.000 | 13.365 |
| 54.000 | 13.617 |
| 55.000 | 13.869 |
| 56.000 | 14.121 |
| 57.000 | 14.373 |
| 58.000 | 14.626 |
| 59.000 | 14.878 |
| BTU | kcal |
|---|---|
| 60.000 | 15.130 |
| 61.000 | 15.382 |
| 62.000 | 15.634 |
| 63.000 | 15.886 |
| 64.000 | 16.139 |
| 65.000 | 16.391 |
| 66.000 | 16.643 |
| 67.000 | 16.895 |
| 68.000 | 17.147 |
| 69.000 | 17.399 |
| 70.000 | 17.652 |
| 71.000 | 17.904 |
| 72.000 | 18.156 |
| 73.000 | 18.408 |
| 74.000 | 18.660 |
| 75.000 | 18.912 |
| 76.000 | 19.165 |
| 77.000 | 19.417 |
| 78.000 | 19.669 |
| 79.000 | 19.921 |
British Thermal Units to Kilocalories Conversion
Converting British Thermal Units (BTU) to Kilocalories (kcal) is a common energy and power conversion. 1 BTU equals 0.252165 kcal. For example, 100 BTU is equal to 25.216539 kcal.
Quick Mental Math: British Thermal Units to Kilocalories
1 British thermal unit is 0.2522 kilocalories, so use that as the mental anchor.
Why is converting British Thermal Units to Kilocalories tricky?
british thermal units to kilocalories mixes thermal units with rate units, so people often miss whether the value is energy or energy per hour.
Quick Reference Values
1 BTU = 0.252165 kcal. 5 BTU = 1.260827 kcal. 10 BTU = 2.521654 kcal. 25 BTU = 6.304135 kcal. 50 BTU = 12.60827 kcal. 100 BTU = 25.216539 kcal.
What is British Thermal Units?
British Thermal Units (BTU) is a unit of energy and power. The British Thermal Unit (BTU) measures energy and is defined as the amount of heat required to raise the temperature of one pound of water by one degree Fahrenheit. One BTU equals approximately 1055.06 joules in the International System of Units (SI). This unit is standardized for heating and cooling system capacities and energy content calculations [nist-sp-811]. The BTU originated in the mid-19th century during the industrial revolution to quantify heat energy for steam engines and heating systems. It was standardized by engineering societies to unify thermal energy measurements in the United Kingdom and the United States [nist-sp-811]. BTU remains widely used in the United States, the United Kingdom, and Canada for HVAC system ratings and energy content in fuels. It is recognized by industry standards and energy regulations but is less common in countries using the SI system exclusively [nist-sp-811].
What is Kilocalories?
Kilocalories (kcal) is a unit of energy and power. A kilocalorie equals exactly 1,000 calories and represents the amount of energy needed to raise the temperature of 1 kilogram of water by 1 degree Celsius. It is widely used to quantify food energy and is equivalent to 4,184 joules [bipm-si-brochure]. The calorie was introduced in the early 19th century by Nicolas Clément as a unit of heat energy. The kilocalorie became standard in nutrition science by the early 20th century to express food energy content [bipm-si-brochure]. Kilocalories are used globally in nutrition labeling, especially in the US and Europe, to indicate energy content of foods. Scientific contexts often prefer joules, but kcal remains prevalent in dietetics [nist-sp-811].
Common Misspellings
People often search for this conversion using these alternate spellings: british thermal unit, btu unit, british therm unit, btu energy, british thermals unit, kilo calories, kcalorie, kilo-calories. All of these refer to the British Thermal Units to Kilocalories conversion.