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Kiloelectronvolts to Kilocalories Converter

Convert kiloelectronvolts (keV) 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 × 10⁻²⁰ kcal
joules (watt-seconds)
1.602176634 × 10⁻¹⁶ J
kilojoules
1.602176634 × 10⁻¹⁹ kJ
megajoules
1.602176634 × 10⁻²² MJ
gigajoules
1.602176634 × 10⁻²⁵ GJ
calories (thermochemical)
3.82929405832 × 10⁻¹⁷ cal
megacalories
3.82929405832 × 10⁻²³ Mcal
watt-hours
4.45049065 × 10⁻²⁰ Wh
kilowatt-hours
4.45049065 × 10⁻²³ kWh
megawatt-hours
4.45049065 × 10⁻²⁶ MWh
British thermal units (IT)
1.51857044347 × 10⁻¹⁹ Btu
million Btu
1.51857044347 × 10⁻²⁵ MMBtu
therms (100,000 Btu)
1.51857044347 × 10⁻²⁴ thm
quads (10¹⁵ Btu)
1.51857044347 × 10⁻³⁴ quad
electronvolts
1,000 eV
megaelectronvolts
0.001 MeV

1 keV = 3.82929405832 × 10⁻²⁰ kcal

Show the working
  1. 1 keV = 3.82929405832e-20 kcal
  2. 1 × 3.82929405832e-20 = 3.82929405832e-20 kcal

How to convert kiloelectronvolts to kilocalories

1 keV = 3.82929405832 × 10⁻²⁰ kcal, so multiply by 3.82929405832 to go from kiloelectronvolts to kilocalories (food Calories). Going the other way, 1 kcal = 2.61144739675 × 10¹⁹ keV.

kcal = keV × 3.82929405832
keV = kcal × 2.61144739675

Worked example:

1 keV = 3.82929405832e-20 kcal
5 × 3.82929405832e-20 = 1.91464702916e-19 kcal

Kiloelectronvolts to kilocalories table

KiloelectronvoltsKilocalories
1 keV3.82929405832 × 10⁻²⁰ kcal
2 keV7.65858811663 × 10⁻²⁰ kcal
3 keV1.1487882175 × 10⁻¹⁹ kcal
4 keV1.53171762333 × 10⁻¹⁹ kcal
5 keV1.91464702916 × 10⁻¹⁹ kcal
6 keV2.29757643499 × 10⁻¹⁹ kcal
7 keV2.68050584082 × 10⁻¹⁹ kcal
8 keV3.06343524665 × 10⁻¹⁹ kcal
9 keV3.44636465249 × 10⁻¹⁹ kcal
10 keV3.82929405832 × 10⁻¹⁹ kcal
15 keV5.74394108748 × 10⁻¹⁹ kcal
20 keV7.65858811663 × 10⁻¹⁹ kcal
25 keV9.57323514579 × 10⁻¹⁹ kcal
30 keV1.1487882175 × 10⁻¹⁸ kcal
40 keV1.53171762333 × 10⁻¹⁸ kcal
50 keV1.91464702916 × 10⁻¹⁸ kcal
75 keV2.87197054374 × 10⁻¹⁸ kcal
100 keV3.82929405832 × 10⁻¹⁸ kcal
250 keV9.57323514579 × 10⁻¹⁸ kcal
500 keV1.91464702916 × 10⁻¹⁷ kcal
1000 keV3.82929405832 × 10⁻¹⁷ kcal

About the units

Kiloelectronvolts (keV)
Kiloelectronvolts, 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