Yoctojoule is 1e-24 joule units.
Yoctojoules to Zeptojoules Converter — yJ to zJ
Convert Yoctojoule (yJ) to Zeptojoule (zJ) using the exact conversion factor (1 yoctojoule = 0.001 zeptojoule). See the formula, worked examples, and conversion table.
Yoctojoules 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 1e-24 / 1e-21.
Energy uses the joule as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Yoctojoules to Zeptojoules
Yoctojoule and Zeptojoule both measure energy, and the conversion is especially useful for comparing nutrition labels (kilocalories) against scientific energy figures (joules). Specifically: Yoctojoule is 1e-24 joule units, and zeptojoule is 1e-21 joule units.
Formula
zeptojoules = yoctojoules × 0.001
This factor comes from each unit's defined relationship to the category's base unit: 1 yoctojoule equals 1e-24 base units, and 1 zeptojoule equals 1e-21 base units, so dividing one by the other gives the direct yoctojoule-to-zeptojoule factor of 0.001.
Simple example
1 yJ × 0.001 = 0.001 zJ
1 yoctojoule = 0.001 zeptojoules.
Real-world example
100 yJ × 0.001 = 0.1 zJ
100 yoctojoules = 0.1 zeptojoules.
Conversion table
| Yoctojoule (yJ) | Zeptojoule (zJ) |
|---|---|
| 1 yJ | 0.001 zJ |
| 10 yJ | 0.01 zJ |
| 100 yJ | 0.1 zJ |
| 500 yJ | 0.5 zJ |
| 1,000 yJ | 1 zJ |
| 2,000 yJ | 2 zJ |
Reverse conversion: Zeptojoule to Yoctojoule
0.001 zJ × 1000 = 1 yJ
0.001 zeptojoules = 1 yoctojoule.
yoctojoules = zeptojoules × 1000
For a page dedicated to this direction, see Zeptojoule to Yoctojoule.
Understanding the Yoctojoule (yJ)
Yoctojoule is 1e-24 joule units.
Understanding the Zeptojoule (zJ)
Zeptojoule is 1e-21 joule units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many zeptojoules are in 1 yoctojoule?
1 yoctojoule equals 0.001 zeptojoules, using the exact defined conversion factor rather than an estimate.
How do I convert yoctojoule to zeptojoule?
Multiply the yoctojoule value by 0.001. The converter above does this instantly to whatever precision you set.
How do I convert zeptojoule back to yoctojoule?
Use the reverse factor: 1 zeptojoule equals 1,000 yoctojoules. You can also use the swap control in the converter above to flip the direction instantly.
What is a yoctojoule?
Yoctojoule (yJ) is a unit of energy.
What is a zeptojoule?
Zeptojoule (zJ) is a unit of energy.
Is the yoctojoule to zeptojoule conversion exact?
Yes. Both yoctojoule and zeptojoule are defined by fixed standards rather than physical artifacts, so the factor of 0.001 used above is exact to as many digits as you choose to display.