Femtojoule is 1e-15 joule units.
Femtojoules to Yoctojoules Converter — fJ to yJ
Convert Femtojoule (fJ) to Yoctojoule (yJ) using the exact conversion factor (1 femtojoule = 1,000,000,000 yoctojoule). See the formula, worked examples, and conversion table.
Femtojoules to Yoctojoules converter
Converter
Engineering Converter
Convert common stress, force, torque, power, and energy units used in engineering.
Context values
Some unit families need one extra value for a physically accurate result.
Yoctojoule is 1e-24 joule units.
Result = input x 1e-15 / 1e-24.
Energy units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Femtojoules to Yoctojoules
Femtojoule and Yoctojoule both measure a quantity used in structural or mechanical engineering — commonly stress, pressure, force, torque, power, or energy — where converting between the unit conventions used in different regions, industries, or equipment specifications is a routine part of design work. Specifically: Femtojoule is 1e-15 joule units, and yoctojoule is 1e-24 joule units.
Formula
yoctojoules = femtojoules × 1000000000
This factor comes from each unit's defined relationship to the category's base unit: 1 femtojoule equals 1e-15 base units, and 1 yoctojoule equals 1e-24 base units, so dividing one by the other gives the direct femtojoule-to-yoctojoule factor of 1000000000.
Simple example
1 fJ × 1000000000 = 1,000,000,000 yJ
1 femtojoule = 1,000,000,000 yoctojoules.
Real-world example
100 fJ × 1000000000 = 100,000,000,000 yJ
100 femtojoules = 100,000,000,000 yoctojoules.
Conversion table
| Femtojoule (fJ) | Yoctojoule (yJ) |
|---|---|
| 1 fJ | 1,000,000,000 yJ |
| 10 fJ | 10,000,000,000 yJ |
| 50 fJ | 50,000,000,000 yJ |
| 100 fJ | 100,000,000,000 yJ |
| 500 fJ | 500,000,000,000 yJ |
| 1,000 fJ | 1e+12 yJ |
Reverse conversion: Yoctojoule to Femtojoule
1 yJ × 1e-9 = 1e-9 fJ
1 yoctojoule = 1e-9 femtojoules.
femtojoules = yoctojoules × 1e-9
For a page dedicated to this direction, see Yoctojoule to Femtojoule.
Understanding the Femtojoule (fJ)
Femtojoule is 1e-15 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 femtojoule?
1 femtojoule equals 1,000,000,000 yoctojoules, using the exact defined conversion factor rather than an estimate.
How do I convert femtojoule to yoctojoule?
Multiply the femtojoule value by 1000000000. The converter above does this instantly to whatever precision you set.
How do I convert yoctojoule back to femtojoule?
Use the reverse factor: 1 yoctojoule equals 1e-9 femtojoules. You can also use the swap control in the converter above to flip the direction instantly.
What is a femtojoule?
Femtojoule (fJ) is a unit of engineering.
What is a yoctojoule?
Yoctojoule (yJ) is a unit of engineering.
Is the femtojoule to yoctojoule conversion exact?
Yes. Both femtojoule and yoctojoule are defined by fixed standards rather than physical artifacts, so the factor of 1000000000 used above is exact to as many digits as you choose to display.
Why do engineering unit conventions vary so much by region and industry?
Pressure, force, and stress can be expressed in metric (pascal, newton), US customary (psi, pound-force), or older and industry-specific units (atmosphere, torr, kip) depending on the country, industry, and even the equipment manufacturer, which is why engineers routinely need to convert between them when working across specs from different sources.