Convert British Thermal Units to Calories

Enter the energy in british thermal units below to get the value converted to calories.

Results in Calories:
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1 BTU = 252.164401 cal

How to Convert British Thermal Units to Calories

To convert a british thermal unit measurement to a calorie measurement, multiply the energy by the conversion ratio. One british thermal unit is equal to 252.164401 calories, so use this simple formula to convert:

calories = british thermal units × 252.164401

The energy in calories is equal to the british thermal units multiplied by 252.164401.

For example, here's how to convert 5 british thermal units to calories using the formula above.
5 BTU = (5 × 252.164401) = 1,260.822004 cal

British thermal units and calories are both units used to measure energy. Keep reading to learn more about each unit of measure.

British Thermal Units

British thermal units are a measure of heat energy. Specifically, one british thermal unit is equal to the amount of heat energy required to increase the temperature of one pound of water one degree Fahrenheit. They are often used as a way to rate the energy heat producing appliances such furnaces, and to price heating fuels such as natural gas.

The british thermal unit is a US customary unit of energy. British thermal units can be abbreviated as BTU, for example 1 british thermal unit can be written as 1 BTU.


One calorie is equal to the heat needed to raise the temperature of one gram of water from 14.5 to 15.5 degrees Celsius.

When measuring the energy content in foods, the large calorie, or kilocalorie is used, but it's often still just called a "calorie." When both the calorie and large calorie are used in the same context it is common to refer to the calorie as a "small calorie."

Calories can be abbreviated as cal, for example 1 calorie can be written as 1 cal.

British Thermal Unit Measurements and Equivalent Calorie Conversions

Common british thermal unit values converted to the equivalent calorie value
British Thermal Units Calories
1 BTU 252.16 cal
2 BTU 504.33 cal
3 BTU 756.49 cal
4 BTU 1,009 cal
5 BTU 1,261 cal
6 BTU 1,513 cal
7 BTU 1,765 cal
8 BTU 2,017 cal
9 BTU 2,269 cal
10 BTU 2,522 cal
11 BTU 2,774 cal
12 BTU 3,026 cal
13 BTU 3,278 cal
14 BTU 3,530 cal
15 BTU 3,782 cal
16 BTU 4,035 cal
17 BTU 4,287 cal
18 BTU 4,539 cal
19 BTU 4,791 cal
20 BTU 5,043 cal
21 BTU 5,295 cal
22 BTU 5,548 cal
23 BTU 5,800 cal
24 BTU 6,052 cal
25 BTU 6,304 cal
26 BTU 6,556 cal
27 BTU 6,808 cal
28 BTU 7,061 cal
29 BTU 7,313 cal
30 BTU 7,565 cal
31 BTU 7,817 cal
32 BTU 8,069 cal
33 BTU 8,321 cal
34 BTU 8,574 cal
35 BTU 8,826 cal
36 BTU 9,078 cal
37 BTU 9,330 cal
38 BTU 9,582 cal
39 BTU 9,834 cal
40 BTU 10,087 cal

More British Thermal Unit Energy Conversions

Convert to Joules
1 BTU is equal to 1,055.06 joules
Convert to Kilojoules
1 BTU is equal to 1.055056 kilojoules
Convert to Megajoules
1 BTU is equal to 0.001055 megajoules
Convert to Gigajoules
1 BTU is equal to 1.0551E-6 gigajoules
Convert to Kilocalories
1 BTU is equal to 0.252164 kilocalories
Convert to Megacalories
1 BTU is equal to 0.000252 megacalories
Watts x Time
Convert to Watt-hours
1 BTU is equal to 0.293071 watt-hours
Convert to Kilowatt-hours
1 BTU is equal to 0.000293 kilowatt-hours
Convert to Megawatt-hours
1 BTU is equal to 2.9307E-7 megawatt-hours
Convert to Watt-seconds
1 BTU is equal to 1,055.06 watt-seconds
Thermal Units
Convert to Million BTU
1 BTU is equal to 1.0E-6 million BTU
Convert to Therms
1 BTU is equal to 1.0E-5 therms
Convert to Quads
1 BTU is equal to 1.0E-15 quads
Convert to Electronvolts
1 BTU is equal to 6,585,100,000,000,000,131,072 electronvolts
Convert to Kiloelectronvolts
1 BTU is equal to 6,585,100,000,000,000,000 kiloelectronvolts
Convert to Megaelectronvolts
1 BTU is equal to 6,585,100,000,000,000 megaelectronvolts