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Electronvolts to Calories Converter

Convert electronvolts (eV) 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
3.82929405832 × 10⁻²⁰ cal
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
kilocalories (food Calories)
3.82929405832 × 10⁻²³ kcal
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 × 10⁻²⁰ cal

Show the working
  1. 1 eV = 3.82929405832e-20 cal
  2. 1 × 3.82929405832e-20 = 3.82929405832e-20 cal

How to convert electronvolts to calories

1 eV = 3.82929405832 × 10⁻²⁰ cal, so multiply by 3.82929405832 to go from electronvolts to calories (thermochemical). Going the other way, 1 cal = 2.61144739675 × 10¹⁹ eV.

cal = eV × 3.82929405832
eV = cal × 2.61144739675

Worked example:

1 eV = 3.82929405832e-20 cal
5 × 3.82929405832e-20 = 1.91464702916e-19 cal

Electronvolts to calories table

ElectronvoltsCalories
1 eV3.82929405832 × 10⁻²⁰ cal
2 eV7.65858811663 × 10⁻²⁰ cal
3 eV1.1487882175 × 10⁻¹⁹ cal
4 eV1.53171762333 × 10⁻¹⁹ cal
5 eV1.91464702916 × 10⁻¹⁹ cal
6 eV2.29757643499 × 10⁻¹⁹ cal
7 eV2.68050584082 × 10⁻¹⁹ cal
8 eV3.06343524665 × 10⁻¹⁹ cal
9 eV3.44636465249 × 10⁻¹⁹ cal
10 eV3.82929405832 × 10⁻¹⁹ cal
15 eV5.74394108748 × 10⁻¹⁹ cal
20 eV7.65858811663 × 10⁻¹⁹ cal
25 eV9.57323514579 × 10⁻¹⁹ cal
30 eV1.1487882175 × 10⁻¹⁸ cal
40 eV1.53171762333 × 10⁻¹⁸ cal
50 eV1.91464702916 × 10⁻¹⁸ cal
75 eV2.87197054374 × 10⁻¹⁸ cal
100 eV3.82929405832 × 10⁻¹⁸ cal
250 eV9.57323514579 × 10⁻¹⁸ cal
500 eV1.91464702916 × 10⁻¹⁷ cal
1000 eV3.82929405832 × 10⁻¹⁷ cal

About the units

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