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Electronvolts to Watt-hours Converter

Convert electronvolts (eV) to watt-hours (Wh), 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
4.45049065 × 10⁻²³ Wh
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
kilocalories (food Calories)
3.82929405832 × 10⁻²³ kcal
megacalories
3.82929405832 × 10⁻²⁶ Mcal
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 = 4.45049065 × 10⁻²³ Wh

Show the working
  1. 1 eV = 4.45049065e-23 Wh
  2. 1 × 4.45049065e-23 = 4.45049065e-23 Wh

How to convert electronvolts to watt-hours

1 eV = 4.45049065 × 10⁻²³ Wh, so multiply by 4.45049065 to go from electronvolts to watt-hours. Going the other way, 1 Wh = 2.24694326681 × 10²² eV.

Wh = eV × 4.45049065
eV = Wh × 2.24694326681

Worked example:

1 eV = 4.45049065e-23 Wh
5 × 4.45049065e-23 = 2.225245325e-22 Wh

Electronvolts to watt-hours table

ElectronvoltsWatt-hours
1 eV4.45049065 × 10⁻²³ Wh
2 eV8.9009813 × 10⁻²³ Wh
3 eV1.335147195 × 10⁻²² Wh
4 eV1.78019626 × 10⁻²² Wh
5 eV2.225245325 × 10⁻²² Wh
6 eV2.67029439 × 10⁻²² Wh
7 eV3.115343455 × 10⁻²² Wh
8 eV3.56039252 × 10⁻²² Wh
9 eV4.005441585 × 10⁻²² Wh
10 eV4.45049065 × 10⁻²² Wh
15 eV6.675735975 × 10⁻²² Wh
20 eV8.9009813 × 10⁻²² Wh
25 eV1.1126226625 × 10⁻²¹ Wh
30 eV1.335147195 × 10⁻²¹ Wh
40 eV1.78019626 × 10⁻²¹ Wh
50 eV2.225245325 × 10⁻²¹ Wh
75 eV3.3378679875 × 10⁻²¹ Wh
100 eV4.45049065 × 10⁻²¹ Wh
250 eV1.1126226625 × 10⁻²⁰ Wh
500 eV2.225245325 × 10⁻²⁰ Wh
1000 eV4.45049065 × 10⁻²⁰ Wh

About the units

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

Formula version 0.1.0Reviewed