Femtojoule is 1e-15 joule units.
Femtojoules to Picojoules Converter — fJ to pJ
Convert Femtojoule (fJ) to Picojoule (pJ) using the exact conversion factor (1 femtojoule = 0.001 picojoule). See the formula, worked examples, and conversion table.
Femtojoules to Picojoules 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.
Picojoule is 1e-12 joule units.
Result = input x 1e-15 / 1e-12.
Energy uses the joule as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Femtojoules to Picojoules
Femtojoule and Picojoule both measure energy, and the conversion is especially useful for comparing nutrition labels (kilocalories) against scientific energy figures (joules). Specifically: Femtojoule is 1e-15 joule units, and picojoule is 1e-12 joule units.
Formula
picojoules = femtojoules × 0.001
This factor comes from each unit's defined relationship to the category's base unit: 1 femtojoule equals 1e-15 base units, and 1 picojoule equals 1e-12 base units, so dividing one by the other gives the direct femtojoule-to-picojoule factor of 0.001.
Simple example
1 fJ × 0.001 = 0.001 pJ
1 femtojoule = 0.001 picojoules.
Real-world example
100 fJ × 0.001 = 0.1 pJ
100 femtojoules = 0.1 picojoules.
Conversion table
| Femtojoule (fJ) | Picojoule (pJ) |
|---|---|
| 1 fJ | 0.001 pJ |
| 10 fJ | 0.01 pJ |
| 100 fJ | 0.1 pJ |
| 500 fJ | 0.5 pJ |
| 1,000 fJ | 1 pJ |
| 2,000 fJ | 2 pJ |
Reverse conversion: Picojoule to Femtojoule
0.001 pJ × 1000 = 1 fJ
0.001 picojoules = 1 femtojoule.
femtojoules = picojoules × 1000
For a page dedicated to this direction, see Picojoule to Femtojoule.
Understanding the Femtojoule (fJ)
Femtojoule is 1e-15 joule units.
Understanding the Picojoule (pJ)
Picojoule is 1e-12 joule units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many picojoules are in 1 femtojoule?
1 femtojoule equals 0.001 picojoules, using the exact defined conversion factor rather than an estimate.
How do I convert femtojoule to picojoule?
Multiply the femtojoule value by 0.001. The converter above does this instantly to whatever precision you set.
How do I convert picojoule back to femtojoule?
Use the reverse factor: 1 picojoule equals 1,000 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 energy.
What is a picojoule?
Picojoule (pJ) is a unit of energy.
Is the femtojoule to picojoule conversion exact?
Yes. Both femtojoule and picojoule 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.