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British Thermal Units to Calories Converter

Convert British thermal units (IT) (Btu) to calories (thermochemical) (cal), 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
252.164400722 cal
joules (watt-seconds)
1,055.05585262 J
kilojoules
1.05505585262 kJ
megajoules
0.00105505585262 MJ
gigajoules
1.05505585262 × 10⁻⁶ GJ
kilocalories (food Calories)
0.252164400722 kcal
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 = 252.164400722 cal

Show the working
  1. 1 Btu = 252.164400722 cal
  2. 1 × 252.164400722 = 252.164400722 cal

How to convert british thermal units to calories

1 Btu = 252.164400722 cal, so multiply by 252.164400722 to go from British thermal units (IT) to calories (thermochemical). Going the other way, 1 cal = 0.00396566683139 Btu.

cal = Btu × 252.164400722
Btu = cal × 0.00396566683139

Worked example:

1 Btu = 252.164400722 cal
5 × 252.164400722 = 1260.82200361 cal

British Thermal Units to calories table

British Thermal UnitsCalories
1 Btu252.164400722 cal
2 Btu504.328801444 cal
3 Btu756.493202165 cal
4 Btu1,008.65760289 cal
5 Btu1,260.82200361 cal
6 Btu1,512.98640433 cal
7 Btu1,765.15080505 cal
8 Btu2,017.31520577 cal
9 Btu2,269.4796065 cal
10 Btu2,521.64400722 cal
15 Btu3,782.46601083 cal
20 Btu5,043.28801444 cal
25 Btu6,304.11001804 cal
30 Btu7,564.93202165 cal
40 Btu10,086.5760289 cal
50 Btu12,608.2200361 cal
75 Btu18,912.3300541 cal
100 Btu25,216.4400722 cal
250 Btu63,041.1001804 cal
500 Btu126,082.200361 cal
1000 Btu252,164.400722 cal

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.
Calories (cal)
Calories (thermochemical), a specialised unit. The thermochemical calorie, 4.184 J, used on US food labels as 1 Calorie = 1 kilocalorie. Definition: NIST SP 811 Appendix B.8, factors for units listed alphabetically.

Formula version 0.1.0Reviewed