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Unit converter

Energy Converter

Convert between joules, calories, kilocalories, kilowatt-hours, BTU, and electronvolts.

Calories to BTU

100 Calories = 0.3965651243 BTU
0.3965651243

About these units

Calories

The calorie is the energy to raise 1 gram of water by 1 °C, about 4.184 joules. It's a small unit used in chemistry and physics.

BTU

The British thermal unit is the energy to raise 1 pound of water by 1 °F, about 1,055 joules. It's used for heating and air conditioning.

Conversion formula

To convert Calorie to BTU, multiply the value by 0.003965651243 (3.965651243 × 10⁻³).

Quick reference

CaloriesBTU
10.003965651243 (3.965651243 × 10⁻³)
20.007931302485 (7.931302485 × 10⁻³)
50.01982825621
100.03965651243
1000.3965651243

Frequently asked questions

How many BTU are in one Calorie?
1 Calorie = 0.003965651243 (3.965651243 × 10⁻³) BTU.
How many Calories are in one BTU?
1 BTU = 252.165392 Calories.

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