Kilojoule is 1000 joule units.
Kilojoules to Yoctojoules Converter — kJ to yJ
Convert Kilojoule (kJ) to Yoctojoule (yJ) using the exact conversion factor (1 kilojoule = 1e+27 yoctojoule). See the formula, worked examples, and conversion table.
Kilojoules to Yoctojoules 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.
Yoctojoule is 1e-24 joule units.
Result = input x 1000 / 1e-24.
Energy uses the joule as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Kilojoules to Yoctojoules
Kilojoule and Yoctojoule both measure energy, and the conversion is especially useful for comparing nutrition labels (kilocalories) against scientific energy figures (joules). Specifically: Kilojoule is 1000 joule units, and yoctojoule is 1e-24 joule units.
Formula
yoctojoules = kilojoules × 1e+27
This factor comes from each unit's defined relationship to the category's base unit: 1 kilojoule equals 1000 base units, and 1 yoctojoule equals 1e-24 base units, so dividing one by the other gives the direct kilojoule-to-yoctojoule factor of 1e+27.
Simple example
1 kJ × 1e+27 = 1e+27 yJ
1 kilojoule = 1e+27 yoctojoules.
Real-world example
100 kJ × 1e+27 = 1e+29 yJ
100 kilojoules = 1e+29 yoctojoules.
Conversion table
| Kilojoule (kJ) | Yoctojoule (yJ) |
|---|---|
| 1 kJ | 1e+27 yJ |
| 10 kJ | 1e+28 yJ |
| 100 kJ | 1e+29 yJ |
| 500 kJ | 5e+29 yJ |
| 1,000 kJ | 1e+30 yJ |
| 2,000 kJ | 2e+30 yJ |
Reverse conversion: Yoctojoule to Kilojoule
1e+27 yJ × 1e-27 = 1 kJ
1e+27 yoctojoules = 1 kilojoules.
kilojoules = yoctojoules × 1e-27
For a page dedicated to this direction, see Yoctojoule to Kilojoule.
Understanding the Kilojoule (kJ)
Kilojoule is 1000 joule units.
Understanding the Yoctojoule (yJ)
Yoctojoule is 1e-24 joule units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many yoctojoules are in 1 kilojoule?
1 kilojoule equals 1e+27 yoctojoules, using the exact defined conversion factor rather than an estimate.
How do I convert kilojoule to yoctojoule?
Multiply the kilojoule value by 1e+27. The converter above does this instantly to whatever precision you set.
How do I convert yoctojoule back to kilojoule?
Use the reverse factor: 1 yoctojoule equals 1e-27 kilojoules. You can also use the swap control in the converter above to flip the direction instantly.
What is a kilojoule?
Kilojoule (kJ) is a unit of energy.
What is a yoctojoule?
Yoctojoule (yJ) is a unit of energy.
Is the kilojoule to yoctojoule conversion exact?
Yes. Both kilojoule and yoctojoule are defined by fixed standards rather than physical artifacts, so the factor of 1e+27 used above is exact to as many digits as you choose to display.