An electronvolt is the energy gained by an electron across one volt.
Electronvolts to Watt-hours Converter — eV to Wh
Convert Electronvolt (eV) to Watt-hour (Wh) using the exact conversion factor (1 electronvolt = 4.450491e-23 watt-hour). See the formula, worked examples, conversion table, unit comparison, and common uses.
Electronvolts to Watt-hours converter
Converter
Energy Converter
Convert joules, calories, kilowatt-hours, BTU, electronvolts, therms, and mechanical work units.
Context values
Some unit families need one extra value for a physically accurate result.
A watt-hour is 3,600 joules.
Result = input x 1.60217663e-19 / 3600.
Energy uses the joule as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Electronvolts to Watt-hours
Electronvolt and Watt-hour both measure energy, and the conversion is especially useful for comparing nutrition labels (kilocalories) against scientific energy figures (joules). Electronvolt is typically associated with standard unit throughout particle physics, atomic physics, and chemistry worldwide, while Watt-hour is typically associated with universal — standard consumer-electronics and battery energy unit worldwide.
Formula
watt-hours = electronvolts × 4.450491e-23
This factor comes from each unit's defined relationship to the category's base unit: 1 electronvolt equals 1.602177e-19 base units, and 1 watt-hour equals 3600 base units, so dividing one by the other gives the direct electronvolt-to-watt-hour factor of 4.450491e-23.
Simple example
1 eV × 4.450491e-23 = 4.450491e-23 Wh
1 electronvolt = 4.450491e-23 watt-hours.
Real-world example
100 eV × 4.450491e-23 = 4.450491e-21 Wh
100 electronvolts = 4.450491e-21 watt-hours.
Conversion table
| Electronvolt (eV) | Watt-hour (Wh) |
|---|---|
| 1 eV | 4.450491e-23 Wh |
| 10 eV | 4.450491e-22 Wh |
| 100 eV | 4.450491e-21 Wh |
| 500 eV | 2.225245e-20 Wh |
| 1,000 eV | 4.450491e-20 Wh |
| 2,000 eV | 8.900981e-20 Wh |
Reverse conversion: Watt-hour to Electronvolt
4.450491e-23 Wh × 2.246943e+22 = 1.000000079 eV
4.450491e-23 watt-hours = 1.000000079 electronvolts.
electronvolts = watt-hours × 2.246943e+22
For a page dedicated to this direction, see Watt-hour to Electronvolt.
Electronvolt vs. Watt-hour
| Aspect | Electronvolt | Watt-hour |
|---|---|---|
| Family | non-SI unit accepted for use with the SI, common in physics | metric derived energy unit |
| Typical use | Particle physics (particle accelerator energies are often quoted in GeV or TeV) | Phone, laptop, and power-bank battery capacity ratings |
| Where it's used | Standard unit throughout particle physics, atomic physics, and chemistry worldwide | Universal — standard consumer-electronics and battery energy unit worldwide |
Understanding the Electronvolt
Electronvolt (eV) measures energy. The energy gained by a single electron accelerated through an electric potential difference of one volt — a very small amount of energy, exactly 1.602176634 × 10⁻¹⁹ joules. It is classified as a non-SI unit accepted for use with the SI, common in physics.
Where it's used: Standard unit throughout particle physics, atomic physics, and chemistry worldwide
Uses of the Electronvolt today
- Particle physics (particle accelerator energies are often quoted in GeV or TeV)
- Atomic and molecular energy levels
- Semiconductor band-gap energies
Understanding the Watt-hour
Watt-hour (Wh) measures energy. The energy delivered by one watt of power sustained for one hour — equal to 3,600 joules. It is classified as a metric derived energy unit.
Where it's used: Universal — standard consumer-electronics and battery energy unit worldwide
Wh vs. kWh. The same unit at different scales: 1,000 Wh equals 1 kWh. Wh suits small consumer-electronics batteries; kWh is used for household electricity billing and larger energy storage.
Uses of the Watt-hour today
- Phone, laptop, and power-bank battery capacity ratings
- Electric-vehicle battery capacity specifications
- Small-scale renewable energy (solar panel) output ratings
Electronvolt — sources
- BIPM SI Brochure, 9th edition — Electronvolt listed as a non-SI unit accepted for use with the SI, with its exact value fixed via the elementary charge.
Watt-hour — sources
- BIPM SI Brochure — Watt-hour as a common energy unit derived from the coherent SI units watt and second (via the hour).
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many watt-hours are in 1 electronvolt?
1 electronvolt equals 4.450491e-23 watt-hours, using the exact defined conversion factor rather than an estimate.
How do I convert electronvolt to watt-hour?
Multiply the electronvolt value by 4.450491e-23. The converter above does this instantly to whatever precision you set.
How do I convert watt-hour back to electronvolt?
Use the reverse factor: 1 watt-hour equals 2.246943e+22 electronvolts. You can also use the swap control in the converter above to flip the direction instantly.
What is a electronvolt?
Electronvolt (eV) measures energy. The energy gained by a single electron accelerated through an electric potential difference of one volt — a very small amount of energy, exactly 1.602176634 × 10⁻¹⁹ joules. It is classified as a non-SI unit accepted for use with the SI, common in physics.
What is a watt-hour?
Watt-hour (Wh) measures energy. The energy delivered by one watt of power sustained for one hour — equal to 3,600 joules. It is classified as a metric derived energy unit.
Is the electronvolt to watt-hour conversion exact?
Yes. The energy gained by a single electron accelerated through an electric potential difference of one volt — a very small amount of energy, exactly 1.602176634 × 10⁻¹⁹ joules. That fixed definition is what the converter above uses, so any rounding you see is a display choice, not a limitation of the math.
What is the difference between wh vs. kwh?
The same unit at different scales: 1,000 Wh equals 1 kWh. Wh suits small consumer-electronics batteries; kWh is used for household electricity billing and larger energy storage.
Where is the electronvolt still used today?
Standard unit throughout particle physics, atomic physics, and chemistry worldwide