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Electronvolts to Joules Converter

Convert electronvolts (eV) to joules (watt-seconds) (J), 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
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
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 = 1.602176634 × 10⁻¹⁹ J

Show the working
  1. 1 eV = 1.602176634e-19 J
  2. 1 × 1.602176634e-19 = 1.602176634e-19 J

How to convert electronvolts to joules

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

J = eV × 1.602176634
eV = J × 6.24150907446

Worked example:

1 eV = 1.602176634e-19 J
5 × 1.602176634e-19 = 8.01088317e-19 J

Electronvolts to joules table

ElectronvoltsJoules
1 eV1.602176634 × 10⁻¹⁹ J
2 eV3.204353268 × 10⁻¹⁹ J
3 eV4.806529902 × 10⁻¹⁹ J
4 eV6.408706536 × 10⁻¹⁹ J
5 eV8.01088317 × 10⁻¹⁹ J
6 eV9.613059804 × 10⁻¹⁹ J
7 eV1.1215236438 × 10⁻¹⁸ J
8 eV1.2817413072 × 10⁻¹⁸ J
9 eV1.4419589706 × 10⁻¹⁸ J
10 eV1.602176634 × 10⁻¹⁸ J
15 eV2.403264951 × 10⁻¹⁸ J
20 eV3.204353268 × 10⁻¹⁸ J
25 eV4.005441585 × 10⁻¹⁸ J
30 eV4.806529902 × 10⁻¹⁸ J
40 eV6.408706536 × 10⁻¹⁸ J
50 eV8.01088317 × 10⁻¹⁸ J
75 eV1.2016324755 × 10⁻¹⁷ J
100 eV1.602176634 × 10⁻¹⁷ J
250 eV4.005441585 × 10⁻¹⁷ J
500 eV8.01088317 × 10⁻¹⁷ J
1000 eV1.602176634 × 10⁻¹⁶ J

About the units

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

Formula version 0.1.0Reviewed