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Joules to Electronvolts Converter

Convert joules (watt-seconds) (J) to electronvolts (eV), 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
6.24150907446 × 10¹⁸ eV
kilojoules
0.001 kJ
megajoules
1 × 10⁻⁶ MJ
gigajoules
1 × 10⁻⁹ GJ
calories (thermochemical)
0.239005736138 cal
kilocalories (food Calories)
0.000239005736138 kcal
megacalories
2.39005736138 × 10⁻⁷ Mcal
watt-hours
0.000277777777778 Wh
kilowatt-hours
2.77777777778 × 10⁻⁷ kWh
megawatt-hours
2.77777777778 × 10⁻¹⁰ MWh
British thermal units (IT)
0.000947817120313 Btu
million Btu
9.47817120313 × 10⁻¹⁰ MMBtu
therms (100,000 Btu)
9.47817120313 × 10⁻⁹ thm
quads (10¹⁵ Btu)
9.47817120313 × 10⁻¹⁹ quad
kiloelectronvolts
6.24150907446 × 10¹⁵ keV
megaelectronvolts
6,241,509,074,460 MeV

1 J = 6.24150907446 × 10¹⁸ eV

Show the working
  1. 1 J = 6.24150907446e18 eV
  2. 1 × 6.24150907446e18 = 6.24150907446e18 eV

How to convert joules to electronvolts

1 J = 6.24150907446 × 10¹⁸ eV, so multiply by 6.24150907446 to go from joules (watt-seconds) to electronvolts. Going the other way, 1 eV = 1.602176634 × 10⁻¹⁹ J.

eV = J × 6.24150907446
J = eV × 1.602176634

Worked example:

1 J = 6.24150907446e18 eV
5 × 6.24150907446e18 = 3.12075453723e19 eV

Joules to electronvolts table

JoulesElectronvolts
1 J6.24150907446 × 10¹⁸ eV
2 J1.24830181489 × 10¹⁹ eV
3 J1.87245272234 × 10¹⁹ eV
4 J2.49660362978 × 10¹⁹ eV
5 J3.12075453723 × 10¹⁹ eV
6 J3.74490544468 × 10¹⁹ eV
7 J4.36905635212 × 10¹⁹ eV
8 J4.99320725957 × 10¹⁹ eV
9 J5.61735816701 × 10¹⁹ eV
10 J6.24150907446 × 10¹⁹ eV
15 J9.36226361169 × 10¹⁹ eV
20 J1.24830181489 × 10²⁰ eV
25 J1.56037726862 × 10²⁰ eV
30 J1.87245272234 × 10²⁰ eV
40 J2.49660362978 × 10²⁰ eV
50 J3.12075453723 × 10²⁰ eV
75 J4.68113180585 × 10²⁰ eV
100 J6.24150907446 × 10²⁰ eV
250 J1.56037726862 × 10²¹ eV
500 J3.12075453723 × 10²¹ eV
1000 J6.24150907446 × 10²¹ eV

About the units

Joules (J)
Joules (watt-seconds), a metric unit. Definition: BIPM SI Brochure, 9th edition (SI units, prefixes and units accepted for use with the SI).
Electronvolts (eV)
Electronvolts, a specialised unit. Definition: NIST CODATA: elementary charge (exact since the 2019 SI redefinition).

Formula version 0.1.0Reviewed