Convert electronvolts to watt-hours

1 eV=4.4505e-23Wh

Use the converter below to change any electronvolts value into watt-hours instantly — with formula, conversion table, and real-world examples.

You have

Equals

4.4505e-23

Conversion formula

Forward

watt-hours = electronvolts × 4.4505e-23

Reverse

electronvolts = watt-hours × 2.2469e22

Example: 10 eV × 4.4505e-23 = 4.4505e-22 Wh.

About both units

From

Electronvolt

The electronvolt equals 1.602 × 10⁻¹⁹ joules — the energy gained by an electron accelerated through 1 volt. It is the natural energy unit of atomic, nuclear and particle physics. Chemical bonds are a few eV; LHC protons reach 7 TeV = 7 × 10¹² eV.

Real-world: Silicon band gap: 1.12 eV. Hydrogen ionization: 13.6 eV. LHC proton: 7 TeV. Photon wavelength 500 nm = 2.5 eV.

Read full electronvolt reference →

Watt-Hour

The watt-hour equals 3600 joules — 1 W delivered for 1 hour. Used for phone, laptop and small-battery capacities. A typical smartphone battery is 10–20 Wh; a laptop is 50–100 Wh.

Real-world: iPhone battery: 12 Wh. MacBook Pro: 70 Wh. Power bank: 20 Wh–100 Wh. Airplane carry-on limit: usually 100 Wh.

Read full watt-hour reference →

Electronvolt to Watt-Hour conversion table

Common electronvolts to watt-hours values for quick reference.

Electronvolt (eV)	Watt-Hour (Wh)
1 eV	4.4505e-23 Wh
10 eV	4.4505e-22 Wh
100 eV	4.4505e-21 Wh
500 eV	2.2252e-20 Wh
1,000 eV	4.4505e-20 Wh
5,000 eV	2.2252e-19 Wh
10,000 eV	4.4505e-19 Wh
50,000 eV	2.2252e-18 Wh
100,000 eV	4.4505e-18 Wh
500,000 eV	2.2252e-17 Wh

Tips & common mistakes

Quick tips

1 eV ≈ 1.602 × 10⁻¹⁹ J.
Particle physics scales: eV → keV → MeV → GeV → TeV (1000× each).
Photon energy (eV) × wavelength (nm) ≈ 1240.

Avoid these

Confusing eV with V (volt) — eV is energy, V is electric potential.
Mixing scales: treating MeV as twice eV — it's a million times larger.
Using eV for macroscopic energy — unwieldy numbers.

Frequently asked questions

How many watt-hours in a electronvolt?

One electronvolt equals 4.4505e-23 watt-hours.

How do I convert electronvolts to watt-hours?

Multiply the electronvolt value by 4.4505e-23 to get the equivalent in watt-hours.

What is 100 electronvolts in watt-hours?

100 electronvolts equals 4.4505e-21 watt-hours.

Is a electronvolt bigger than a watt-hour?

No. 1 electronvolt equals 4.4505e-23 watt-hours, so one electronvolt is smaller.

How to convert electronvolts to watt-hours without a calculator?

Multiply by 0 for a quick estimate; use a calculator for precise results.

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