An electronvolt is the energy gained by an electron across one volt.
Electronvolts to Zeptojoules Converter — eV to zJ
Convert Electronvolt (eV) to Zeptojoule (zJ) using the exact conversion factor (1 electronvolt = 160.2176634 zeptojoule). See the formula, worked examples, conversion table, and common uses.
Electronvolts to Zeptojoules 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.
Zeptojoule is 1e-21 joule units.
Result = input x 1.60217663e-19 / 1e-21.
Energy uses the joule as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Electronvolts to Zeptojoules
Electronvolt and Zeptojoule both measure energy, and the conversion is especially useful for comparing nutrition labels (kilocalories) against scientific energy figures (joules). Electronvolt is most often used for particle physics (particle accelerator energies are often quoted in gev or tev).
Formula
zeptojoules = electronvolts × 160.2176634
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 zeptojoule equals 1e-21 base units, so dividing one by the other gives the direct electronvolt-to-zeptojoule factor of 160.2176634.
Simple example
1 eV × 160.2176634 = 160.2176634 zJ
1 electronvolt = 160.2176634 zeptojoules.
Real-world example
100 eV × 160.2176634 = 16,021.76634 zJ
100 electronvolts = 16,021.76634 zeptojoules.
Conversion table
| Electronvolt (eV) | Zeptojoule (zJ) |
|---|---|
| 1 eV | 160.2176634 zJ |
| 10 eV | 1,602.176634 zJ |
| 100 eV | 16,021.76634 zJ |
| 500 eV | 80,108.8317 zJ |
| 1,000 eV | 160,217.6634 zJ |
| 2,000 eV | 320,435.3268 zJ |
Reverse conversion: Zeptojoule to Electronvolt
160.2176634 zJ × 0.006241509074 = 1 eV
160.2176634 zeptojoules = 1 electronvolt.
electronvolts = zeptojoules × 0.00624150907446
For a page dedicated to this direction, see Zeptojoule to Electronvolt.
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 Zeptojoule (zJ)
Zeptojoule is 1e-21 joule units.
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 zeptojoules are in 1 electronvolt?
1 electronvolt equals 160.2176634 zeptojoules, using the exact defined conversion factor rather than an estimate.
How do I convert electronvolt to zeptojoule?
Multiply the electronvolt value by 160.2176634. The converter above does this instantly to whatever precision you set.
How do I convert zeptojoule back to electronvolt?
Use the reverse factor: 1 zeptojoule equals 0.0062415091 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 zeptojoule?
Zeptojoule (zJ) is a unit of energy.
Is the electronvolt to zeptojoule 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.
Where is the electronvolt still used today?
Standard unit throughout particle physics, atomic physics, and chemistry worldwide