Convert British thermal unit to Food calorie (large calorie)

British thermal unit [Btu]

Food calorie (large calorie) [kcal]

Unit definitions

The British thermal unit (Btu) is the amount of thermal energy required to raise the temperature of one pound of water by one degree Fahrenheit.

$10^{3}$ small calories is a food calorie. When we talk about calories in our food, we usually mean large calories.

$$\text{Energy}_{\text{kcal}} = \text{Energy}_{\text{Btu}} \cdot 0.2519967516958058660552211713002771$$

Convert $20.0\ \text{Btu}$ to $\text{kcal}$.

$$\text{Energy}_{\text{kcal}} = 20.0 \cdot 0.2519967516958058660552211713002771$$

$$\text{Energy}_{\text{kcal}} = 5.039935$$

$$\therefore \ 20.0\ \text{Btu} = 5.039935 \ \text{kcal}$$

Convert $70.0\ \text{Btu}$ to $\text{kcal}$.

$$\text{Energy}_{\text{kcal}} = 70.0 \cdot 0.2519967516958058660552211713002771$$

$$\text{Energy}_{\text{kcal}} = 17.639773$$

$$\therefore \ 70.0\ \text{Btu} = 17.639773 \ \text{kcal}$$

Convert $120.0\ \text{Btu}$ to $\text{kcal}$.

$$\text{Energy}_{\text{kcal}} = 120.0 \cdot 0.2519967516958058660552211713002771$$

$$\text{Energy}_{\text{kcal}} = 30.23961$$

$$\therefore \ 120.0\ \text{Btu} = 30.23961 \ \text{kcal}$$

Convert $150.0\ \text{Btu}$ to $\text{kcal}$.

$$\text{Energy}_{\text{kcal}} = 150.0 \cdot 0.2519967516958058660552211713002771$$

$$\text{Energy}_{\text{kcal}} = 37.799513$$

$$\therefore \ 150.0\ \text{Btu} = 37.799513 \ \text{kcal}$$

Convert $200.0\ \text{Btu}$ to $\text{kcal}$.

$$\text{Energy}_{\text{kcal}} = 200.0 \cdot 0.2519967516958058660552211713002771$$

$$\text{Energy}_{\text{kcal}} = 50.39935$$

$$\therefore \ 200.0\ \text{Btu} = 50.39935 \ \text{kcal}$$

British thermal unit to Food calorie (large calorie) conversion table
British thermal unit [Btu]	Food calorie (large calorie) [kcal]
1	0.251997
2	0.503994
3	0.75599
4	1.007987
5	1.259984
6	1.511981
7	1.763977
8	2.015974
9	2.267971
10	2.519968