Zeptojoule is 1e-21 joule units.
Zeptojoules to Electronvolts Converter — zJ to eV
Convert Zeptojoule (zJ) to Electronvolt (eV) using the exact conversion factor (1 zeptojoule = 0.0062415091 electronvolt). See the formula, worked examples, conversion table, and common uses.
Zeptojoules 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 1e-21 / 1.60217663e-19.
Energy uses the joule as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Zeptojoules to Electronvolts
Zeptojoule and Electronvolt both measure energy, and the conversion is especially useful for comparing nutrition labels (kilocalories) against scientific energy figures (joules). Specifically: Zeptojoule is 1e-21 joule units, and an electronvolt is the energy gained by an electron across one volt.
Formula
electronvolts = zeptojoules × 0.00624150907446
This factor comes from each unit's defined relationship to the category's base unit: 1 zeptojoule equals 1e-21 base units, and 1 electronvolt equals 1.602177e-19 base units, so dividing one by the other gives the direct zeptojoule-to-electronvolt factor of 0.00624150907446.
Simple example
1 zJ × 0.006241509074 = 0.0062415091 eV
1 zeptojoule = 0.0062415091 electronvolts.
Real-world example
100 zJ × 0.006241509074 = 0.6241509074 eV
100 zeptojoules = 0.6241509074 electronvolts.
Conversion table
| Zeptojoule (zJ) | Electronvolt (eV) |
|---|---|
| 1 zJ | 0.0062415091 eV |
| 10 zJ | 0.0624150907 eV |
| 100 zJ | 0.6241509074 eV |
| 500 zJ | 3.120754537 eV |
| 1,000 zJ | 6.241509074 eV |
| 2,000 zJ | 12.48301815 eV |
Reverse conversion: Electronvolt to Zeptojoule
0.0062415091 eV × 160.2176634 = 1.000000004 zJ
0.0062415091 electronvolts = 1.000000004 zeptojoules.
zeptojoules = electronvolts × 160.2176634
For a page dedicated to this direction, see Electronvolt to Zeptojoule.
Understanding the Zeptojoule (zJ)
Zeptojoule is 1e-21 joule units.
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
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 zeptojoule?
1 zeptojoule equals 0.0062415091 electronvolts, using the exact defined conversion factor rather than an estimate.
How do I convert zeptojoule to electronvolt?
Multiply the zeptojoule value by 0.006241509074. The converter above does this instantly to whatever precision you set.
How do I convert electronvolt back to zeptojoule?
Use the reverse factor: 1 electronvolt equals 160.2176634 zeptojoules. You can also use the swap control in the converter above to flip the direction instantly.
What is a zeptojoule?
Zeptojoule (zJ) is a unit of energy.
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 zeptojoule 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.