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Electronvolts to Kilocalories Converter

Convert electronvolts (eV) 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
3.82929405832 × 10⁻²³ kcal
joules (watt-seconds)
1.602176634 × 10⁻¹⁹ J
kilojoules
1.602176634 × 10⁻²² kJ
megajoules
1.602176634 × 10⁻²⁵ MJ
gigajoules
1.602176634 × 10⁻²⁸ GJ
calories (thermochemical)
3.82929405832 × 10⁻²⁰ cal
megacalories
3.82929405832 × 10⁻²⁶ Mcal
watt-hours
4.45049065 × 10⁻²³ Wh
kilowatt-hours
4.45049065 × 10⁻²⁶ kWh
megawatt-hours
4.45049065 × 10⁻²⁹ MWh
British thermal units (IT)
1.51857044347 × 10⁻²² Btu
million Btu
1.51857044347 × 10⁻²⁸ MMBtu
therms (100,000 Btu)
1.51857044347 × 10⁻²⁷ thm
quads (10¹⁵ Btu)
1.51857044347 × 10⁻³⁷ quad
kiloelectronvolts
0.001 keV
megaelectronvolts
1 × 10⁻⁶ MeV

1 eV = 3.82929405832 × 10⁻²³ kcal

Show the working
  1. 1 eV = 3.82929405832e-23 kcal
  2. 1 × 3.82929405832e-23 = 3.82929405832e-23 kcal

How to convert electronvolts to kilocalories

1 eV = 3.82929405832 × 10⁻²³ kcal, so multiply by 3.82929405832 to go from electronvolts to kilocalories (food Calories). Going the other way, 1 kcal = 2.61144739675 × 10²² eV.

kcal = eV × 3.82929405832
eV = kcal × 2.61144739675

Worked example:

1 eV = 3.82929405832e-23 kcal
5 × 3.82929405832e-23 = 1.91464702916e-22 kcal

Electronvolts to kilocalories table

ElectronvoltsKilocalories
1 eV3.82929405832 × 10⁻²³ kcal
2 eV7.65858811663 × 10⁻²³ kcal
3 eV1.1487882175 × 10⁻²² kcal
4 eV1.53171762333 × 10⁻²² kcal
5 eV1.91464702916 × 10⁻²² kcal
6 eV2.29757643499 × 10⁻²² kcal
7 eV2.68050584082 × 10⁻²² kcal
8 eV3.06343524665 × 10⁻²² kcal
9 eV3.44636465249 × 10⁻²² kcal
10 eV3.82929405832 × 10⁻²² kcal
15 eV5.74394108748 × 10⁻²² kcal
20 eV7.65858811663 × 10⁻²² kcal
25 eV9.57323514579 × 10⁻²² kcal
30 eV1.1487882175 × 10⁻²¹ kcal
40 eV1.53171762333 × 10⁻²¹ kcal
50 eV1.91464702916 × 10⁻²¹ kcal
75 eV2.87197054374 × 10⁻²¹ kcal
100 eV3.82929405832 × 10⁻²¹ kcal
250 eV9.57323514579 × 10⁻²¹ kcal
500 eV1.91464702916 × 10⁻²⁰ kcal
1000 eV3.82929405832 × 10⁻²⁰ kcal

About the units

Electronvolts (eV)
Electronvolts, a specialised unit. Definition: NIST CODATA: elementary charge (exact since the 2019 SI redefinition).
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