Skip to content
RK Calculator
Menu

British Thermal Units to Kilocalories Converter

Convert British thermal units (IT) (Btu) to kilocalories (food Calories) (kcal), with the formula, a conversion table and exact factors.

Change the values and press Calculate to work out your own figures.

Enter an amount of energy, choose its unit and the unit you want. The answer is exact until it is shown, and the same value appears in every other unit.

A number, fraction (3/8), mixed number (1 1/2), scientific notation (2.5e6) or a simple sum such as 2*3.
The unit you want the answer in. Swap exchanges the two units.
Result
0.252164400722 kcal
joules (watt-seconds)
1,055.05585262 J
kilojoules
1.05505585262 kJ
megajoules
0.00105505585262 MJ
gigajoules
1.05505585262 × 10⁻⁶ GJ
calories (thermochemical)
252.164400722 cal
megacalories
0.000252164400722 Mcal
watt-hours
0.293071070172 Wh
kilowatt-hours
0.000293071070172 kWh
megawatt-hours
2.93071070172 × 10⁻⁷ MWh
million Btu
1 × 10⁻⁶ MMBtu
therms (100,000 Btu)
1 × 10⁻⁵ thm
quads (10¹⁵ Btu)
1 × 10⁻¹⁵ quad
electronvolts
6.58514067819 × 10²¹ eV
kiloelectronvolts
6.58514067819 × 10¹⁸ keV
megaelectronvolts
6.58514067819 × 10¹⁵ MeV

1 Btu = 0.252164400722 kcal

Show the working
  1. 1 Btu = 0.252164400722 kcal
  2. 1 × 0.252164400722 = 0.252164400722 kcal

How to convert british thermal units to kilocalories

1 Btu = 0.252164400722 kcal, so multiply by 0.252164400722 to go from British thermal units (IT) to kilocalories (food Calories). Going the other way, 1 kcal = 3.96566683139 Btu.

kcal = Btu × 0.252164400722
Btu = kcal × 3.96566683139

Worked example:

1 Btu = 0.252164400722 kcal
5 × 0.252164400722 = 1.26082200361 kcal

British Thermal Units to kilocalories table

British Thermal UnitsKilocalories
1 Btu0.252164400722 kcal
2 Btu0.504328801444 kcal
3 Btu0.756493202165 kcal
4 Btu1.00865760289 kcal
5 Btu1.26082200361 kcal
6 Btu1.51298640433 kcal
7 Btu1.76515080505 kcal
8 Btu2.01731520577 kcal
9 Btu2.2694796065 kcal
10 Btu2.52164400722 kcal
15 Btu3.78246601083 kcal
20 Btu5.04328801444 kcal
25 Btu6.30411001804 kcal
30 Btu7.56493202165 kcal
40 Btu10.0865760289 kcal
50 Btu12.6082200361 kcal
75 Btu18.9123300541 kcal
100 Btu25.2164400722 kcal
250 Btu63.0411001804 kcal
500 Btu126.082200361 kcal
1000 Btu252.164400722 kcal

About the units

British Thermal Units (Btu)
British thermal units (IT), a US customary unit. Definition: NIST SP 811 Appendix B.8, factors for units listed alphabetically.
Kilocalories (kcal)
Kilocalories (food Calories), a specialised unit. Definition: NIST SP 811 Appendix B.8, factors for units listed alphabetically.

Formula version 0.1.0Reviewed