British Thermal Units to Kilocalories Converter

One British Thermal Unit equals 0.2521644007 Kilocalories (1 BTU = 0.2521644007 kcal). Multiply a British Thermal Unit value by 0.2521644007 to get the equivalent in Kilocalories. Enter your value in the calculator above. The formula and examples below show how to calculate it by hand.

Formula

kcal = BTU × 0.2521644007

Multiply the British Thermal Unit value by 0.2521644007 to get the equivalent value in Kilocalories.

Example Conversions

1 British Thermal Unit (BTU)

0.2521644007 Kilocalorie (kcal)

5 British Thermal Unit (BTU)

1.260822004 Kilocalorie (kcal)

10 British Thermal Unit (BTU)

2.521644007 Kilocalorie (kcal)

25 British Thermal Unit (BTU)

6.304110018 Kilocalorie (kcal)

100 British Thermal Unit (BTU)

25.21644007 Kilocalorie (kcal)

Conversion Table

Common conversion values from British Thermal Unit to Kilocalorie
British Thermal Unit (BTU)Kilocalorie (kcal)
0.10.02521644007
0.50.1260822004
10.2521644007
20.5043288014
51.260822004
102.521644007
256.304110018
5012.60822004
10025.21644007
25063.04110018
500126.0822004
1000252.1644007

How to Convert Manually

Use these steps to convert British Thermal Unit values to Kilocalorie without the calculator.

  1. Write down the value in British Thermal Unit (BTU) that you want to convert.
  2. Multiply that value by 0.2521644007.
  3. For example, 10 British Thermal Units × 0.2521644007 = 2.521644007 Kilocalories.
  4. Label the result as Kilocalorie (kcal).

Relative Size Comparison

1 British Thermal Unit
1 BTU
1 Kilocalorie3.965666831 British Thermal Units
1 kcal

This chart shows the visual difference in size between exactly one British Thermal Unit and one Kilocalorie.

About British Thermal Unit and Kilocalorie

The British thermal unit is about 1,055.06 joules, the heat to raise one pound of water by 1 °F. US heating and cooling equipment is rated in BTU per hour. The kilocalorie is 4,184 joules. It is the food 'Calorie' (capital C) on US nutrition labels. Diet tracking and exercise burn estimates use kilocalories. One British Thermal Unit equals 0.2521644007 Kilocalories (1 BTU = 0.2521644007 kcal). British Thermal Unit is used in air conditioner and furnace ratings in the US and in US natural gas appliance specs. Kilocalorie is used in nutrition labels and diet tracking.

Precision and Rounding:Energy factors mix exact definitions (1 kWh = 3,600,000 J; 1 cal = 4.184 J thermochemical) with measured conventions (1 BTU ≈ 1,055.056 J). Nutrition and utility bills round to whole units; engineering heat calculations should keep the full factor until the final step.

Conversion factors per NIST Special Publication 811 and the BIPM SI Brochure (9th edition) (reference).

Worked Example

15British Thermal Units equals3.782466011Kilocalories.

15 BTU × 0.2521644007 = 3.782466011 kcal

FAQ

How do I convert British Thermal Unit to Kilocalorie?

Multiply the British Thermal Unit value by 0.2521644007 to get the equivalent value in Kilocalories.

What is the formula for British Thermal Unit to Kilocalorie?

The formula is kcal = BTU × 0.2521644007.

How many Kilocalories are in 1 British Thermal Unit?

1 British Thermal Unit equals 0.2521644007 Kilocalories.

Can I convert Kilocalorie back to British Thermal Unit?

Yes. 1 Kilocalorie equals 3.965666831 British Thermal Units, and the related converter can reverse the calculation.

What are common names for British Thermal Unit and Kilocalorie?

British Thermal Unit is shown as BTU and may also be searched as btu, british thermal unit. Kilocalorie is shown as kcal and may also be searched as kilocalorie, kilocalories, food calorie.

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