eV to Wh Converter

How to convert electronvolts to watt-hours

FormulaWh = eV × 4.45049065×10⁻²³

Multiply the value in electronvolts by 4.45049065×10⁻²³. To go the other way, multiply by 2.246943267×10²² (or divide by 4.45049065×10⁻²³).

An electronvolt is smaller than a watt-hour: it takes 2.246943267×10²² electronvolts to make one watt-hour.

Worked examples

1 electronvolt1 eV × 4.45049065×10⁻²³ = 4.45049065×10⁻²³ Wh
5 electronvolts5 eV × 4.45049065×10⁻²³ = 2.225245325×10⁻²² Wh
10 electronvolts10 eV × 4.45049065×10⁻²³ = 4.45049065×10⁻²² Wh
20 electronvolts20 eV × 4.45049065×10⁻²³ = 8.9009813×10⁻²² Wh
100 electronvolts100 eV × 4.45049065×10⁻²³ = 4.45049065×10⁻²¹ Wh

Electronvolts to watt-hours conversion table

Values are calculated by the conversion engine and rounded to 8 significant figures.

Electronvolts to watt-hours: 0.1–10 eV
Electronvolts (eV)	Watt-hours (Wh)
0.1 eV	4.4504907×10⁻²⁴ Wh
0.25 eV	1.1126227×10⁻²³ Wh
0.5 eV	2.2252453×10⁻²³ Wh
1 eV	4.4504906×10⁻²³ Wh
2 eV	8.9009813×10⁻²³ Wh
3 eV	1.3351472×10⁻²² Wh
4 eV	1.7801963×10⁻²² Wh
5 eV	2.2252453×10⁻²² Wh
6 eV	2.6702944×10⁻²² Wh
7 eV	3.1153435×10⁻²² Wh
8 eV	3.5603925×10⁻²² Wh
9 eV	4.0054416×10⁻²² Wh
10 eV	4.4504906×10⁻²² Wh

Electronvolts to watt-hours: 12–1,000 eV
Electronvolts (eV)	Watt-hours (Wh)
12 eV	5.3405888×10⁻²² Wh
15 eV	6.675736×10⁻²² Wh
20 eV	8.9009813×10⁻²² Wh
25 eV	1.1126227×10⁻²¹ Wh
30 eV	1.3351472×10⁻²¹ Wh
40 eV	1.7801963×10⁻²¹ Wh
50 eV	2.2252453×10⁻²¹ Wh
75 eV	3.337868×10⁻²¹ Wh
100 eV	4.4504906×10⁻²¹ Wh
250 eV	1.1126227×10⁻²⁰ Wh
500 eV	2.2252453×10⁻²⁰ Wh
1,000 eV	4.4504906×10⁻²⁰ Wh

About the units

Electronvolt (eV)

The energy an electron gains across one volt: exactly 1.602176634 × 10⁻¹⁹ J. One electronvolt equals 1.602176634×10⁻¹⁹ joules (J).

Watt-hour (Wh)

One watt sustained for an hour: 3,600 J. Battery capacities are rated in Wh.

Frequently asked questions

How many watt-hours are in one electronvolt?

There are 4.45049065×10⁻²³ watt-hours in one electronvolt, and this value is exact by definition.

How do I convert electronvolts to watt-hours?

Multiply the number of electronvolts by 4.45049065×10⁻²³. For example, 10 eV × 4.45049065×10⁻²³ = 4.45049065×10⁻²² Wh.

How many electronvolts are in one watt-hour?

One watt-hour equals 2.246943267×10²² electronvolts. That is the reverse factor, 1 ÷ 4.45049065×10⁻²³.

What is 10 electronvolts in watt-hours?

10 eV = 4.45049065×10⁻²² Wh.

Is this eV to Wh converter accurate?

Yes. Both units are defined exactly in terms of SI units, so the conversion factor is exact; results are shown to 12 significant figures by default and you can change precision in the converter. Calculations run in your browser using the same tested engine that generated this page.