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Kilocalories to British Thermal Units Converter

Convert kilocalories (food Calories) (kcal) to British thermal units (IT) (Btu), 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
3.96566683139 Btu
joules (watt-seconds)
4,184 J
kilojoules
4.184 kJ
megajoules
0.004184 MJ
gigajoules
4.184 × 10⁻⁶ GJ
calories (thermochemical)
1,000 cal
megacalories
0.001 Mcal
watt-hours
1.16222222222 Wh
kilowatt-hours
0.00116222222222 kWh
megawatt-hours
1.16222222222 × 10⁻⁶ MWh
million Btu
3.96566683139 × 10⁻⁶ MMBtu
therms (100,000 Btu)
3.96566683139 × 10⁻⁵ thm
quads (10¹⁵ Btu)
3.96566683139 × 10⁻¹⁵ quad
electronvolts
2.61144739675 × 10²² eV
kiloelectronvolts
2.61144739675 × 10¹⁹ keV
megaelectronvolts
2.61144739675 × 10¹⁶ MeV

1 kcal = 3.96566683139 Btu

Show the working
  1. 1 kcal = 3.96566683139 Btu
  2. 1 × 3.96566683139 = 3.96566683139 Btu

How to convert kilocalories to british thermal units

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

Btu = kcal × 3.96566683139
kcal = Btu × 0.252164400722

Worked example:

1 kcal = 3.96566683139 Btu
5 × 3.96566683139 = 19.828334157 Btu

Kilocalories to british thermal units table

KilocaloriesBritish Thermal Units
1 kcal3.96566683139 Btu
2 kcal7.93133366278 Btu
3 kcal11.8970004942 Btu
4 kcal15.8626673256 Btu
5 kcal19.828334157 Btu
6 kcal23.7940009883 Btu
7 kcal27.7596678197 Btu
8 kcal31.7253346511 Btu
9 kcal35.6910014825 Btu
10 kcal39.6566683139 Btu
15 kcal59.4850024709 Btu
20 kcal79.3133366278 Btu
25 kcal99.1416707848 Btu
30 kcal118.970004942 Btu
40 kcal158.626673256 Btu
50 kcal198.28334157 Btu
75 kcal297.425012354 Btu
100 kcal396.566683139 Btu
250 kcal991.416707848 Btu
500 kcal1,982.8334157 Btu
1000 kcal3,965.66683139 Btu

About the units

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

Formula version 0.1.0Reviewed