A watt-hour is 3,600 joules.
Watt-hours to Electronvolts Converter — Wh to eV
Convert Watt-hour (Wh) to Electronvolt (eV) using the exact conversion factor (1 watt-hour = 2.246943e+22 electronvolt). See the formula, worked examples, conversion table, unit comparison, and common uses.
Watt-hours to Electronvolts 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.
An electronvolt is the energy gained by an electron across one volt.
Result = input x 3600 / 1.60217663e-19.
Energy uses the joule as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Watt-hours to Electronvolts
Watt-hour and Electronvolt both measure energy, and the conversion is especially useful for comparing nutrition labels (kilocalories) against scientific energy figures (joules). Watt-hour is typically associated with universal — standard consumer-electronics and battery energy unit worldwide, while Electronvolt is typically associated with standard unit throughout particle physics, atomic physics, and chemistry worldwide.
Formula
electronvolts = watt-hours × 2.246943e+22
This factor comes from each unit's defined relationship to the category's base unit: 1 watt-hour equals 3600 base units, and 1 electronvolt equals 1.602177e-19 base units, so dividing one by the other gives the direct watt-hour-to-electronvolt factor of 2.246943e+22.
Simple example
1 Wh × 2.246943e+22 = 2.246943e+22 eV
1 watt-hour = 2.246943e+22 electronvolts.
Real-world example
100 Wh × 2.246943e+22 = 2.246943e+24 eV
100 watt-hours = 2.246943e+24 electronvolts.
Conversion table
| Watt-hour (Wh) | Electronvolt (eV) |
|---|---|
| 1 Wh | 2.246943e+22 eV |
| 10 Wh | 2.246943e+23 eV |
| 100 Wh | 2.246943e+24 eV |
| 500 Wh | 1.123472e+25 eV |
| 1,000 Wh | 2.246943e+25 eV |
| 2,000 Wh | 4.493887e+25 eV |
Reverse conversion: Electronvolt to Watt-hour
2.246943e+22 eV × 4.450491e-23 = 0.9999998813 Wh
2.246943e+22 electronvolts = 0.9999998813 watt-hours.
watt-hours = electronvolts × 4.450491e-23
For a page dedicated to this direction, see Electronvolt to Watt-hour.
Watt-hour vs. Electronvolt
| Aspect | Watt-hour | Electronvolt |
|---|---|---|
| Family | metric derived energy unit | non-SI unit accepted for use with the SI, common in physics |
| Typical use | Phone, laptop, and power-bank battery capacity ratings | Particle physics (particle accelerator energies are often quoted in GeV or TeV) |
| Where it's used | Universal — standard consumer-electronics and battery energy unit worldwide | Standard unit throughout particle physics, atomic physics, and chemistry worldwide |
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
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
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).
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.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many electronvolts are in 1 watt-hour?
1 watt-hour equals 2.246943e+22 electronvolts, using the exact defined conversion factor rather than an estimate.
How do I convert watt-hour to electronvolt?
Multiply the watt-hour value by 2.246943e+22. The converter above does this instantly to whatever precision you set.
How do I convert electronvolt back to watt-hour?
Use the reverse factor: 1 electronvolt equals 4.450491e-23 watt-hours. You can also use the swap control in the converter above to flip the direction instantly.
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.
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.
Is the watt-hour to electronvolt 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 watt-hour still used today?
Universal — standard consumer-electronics and battery energy unit worldwide