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Calories to British Thermal Units Converter

Convert calories to british thermal units and back instantly with formula and common values.

cal

British Thermal Units

0.0448

BTU

11.3 cal = 0.0448 BTU

BTU = cal × 0.00396565

Calories to British Thermal Units: 1 cal equals 0.003966 BTU. To convert calories to british thermal units, multiply by 0.003966 (BTU = cal × 0.00396565). For example, 10 cal = 0.039657 BTU.

How to Convert Calories to British Thermal Units

To convert from calories to british thermal units, multiply the value by 0.003966. The conversion is linear, meaning doubling the input doubles the output.

Conversion Formula

  • Calories to British Thermal Units: BTU = cal × 0.00396565
  • British Thermal Units to Calories: cal = BTU ÷ 0.00396565

Calories to British Thermal Units Conversion Chart

Calories (cal)British Thermal Units (BTU)
0.10.000397
0.250.000991
0.50.001983
10.003966
20.007931
30.011897
50.019828
100.039657
200.079313
250.099141
500.198283
1000.396565
2500.991413
10003.965651

Understanding the Units

What is a Calorie?

The thermochemical calorie equals exactly 4.184 joules; the historical "small" calorie raised one gram of water by one degree Celsius.

Common contexts: chemistry, historical thermodynamics.

What is a British Thermal Unit?

A British thermal unit (BTU) equals approximately 1,055.06 joules — the energy needed to raise one pound of water by one degree Fahrenheit.

Common contexts: HVAC, natural gas (US), heating systems.

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FAQ

How do I convert calories to british thermal units?

Multiply by 0.00396565. For example, 11.3 cal × 0.00396565 = 0.0448 BTU.

What is the formula for calories to british thermal units?

The formula is: BTU = cal × 0.00396565.

How many british thermal units are in one calorie?

One calorie equals 0.004 british thermal units.

How many british thermal units are in 1 calory?

1 cal equals 0.003966 BTU.

How do you convert calories to british thermal units?

Multiply the calory value by 0.003966. Formula: BTU = cal × 0.00396565.

How many british thermal units are in 5 calories?

5 cal = 0.019828 BTU.

How do you convert british thermal units back to calories?

Use the inverse formula: cal = BTU ÷ 0.00396565. For example, 1 BTU = 252.165395 cal.

What is the difference between Calory and British Thermal Unit?

The thermochemical calorie equals exactly 4.184 joules; the historical "small" calorie raised one gram of water by one degree Celsius. A British thermal unit (BTU) equals approximately 1,055.06 joules — the energy needed to raise one pound of water by one degree Fahrenheit.