Microjoule is 0.000001 joule units.
Microjoules to Femtojoules Converter — uJ to fJ
Convert Microjoule (uJ) to Femtojoule (fJ) using the exact conversion factor (1 microjoule = 1,000,000,000 femtojoule). See the formula, worked examples, and conversion table.
Microjoules to Femtojoules 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.
Femtojoule is 1e-15 joule units.
Result = input x 1e-6 / 1e-15.
Energy uses the joule as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Microjoules to Femtojoules
Microjoule and Femtojoule both measure energy, and the conversion is especially useful for comparing nutrition labels (kilocalories) against scientific energy figures (joules). Specifically: Microjoule is 0.000001 joule units, and femtojoule is 1e-15 joule units.
Formula
femtojoules = microjoules × 1000000000
This factor comes from each unit's defined relationship to the category's base unit: 1 microjoule equals 0.000001 base units, and 1 femtojoule equals 1e-15 base units, so dividing one by the other gives the direct microjoule-to-femtojoule factor of 1000000000.
Simple example
1 uJ × 1000000000 = 1,000,000,000 fJ
1 microjoule = 1,000,000,000 femtojoules.
Real-world example
100 uJ × 1000000000 = 100,000,000,000 fJ
100 microjoules = 100,000,000,000 femtojoules.
Conversion table
| Microjoule (uJ) | Femtojoule (fJ) |
|---|---|
| 1 uJ | 1,000,000,000 fJ |
| 10 uJ | 10,000,000,000 fJ |
| 100 uJ | 100,000,000,000 fJ |
| 500 uJ | 500,000,000,000 fJ |
| 1,000 uJ | 1e+12 fJ |
| 2,000 uJ | 2e+12 fJ |
Reverse conversion: Femtojoule to Microjoule
1 fJ × 1e-9 = 1e-9 uJ
1 femtojoule = 1e-9 microjoules.
microjoules = femtojoules × 1e-9
For a page dedicated to this direction, see Femtojoule to Microjoule.
Understanding the Microjoule (uJ)
Microjoule is 0.000001 joule units.
Understanding the Femtojoule (fJ)
Femtojoule is 1e-15 joule units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many femtojoules are in 1 microjoule?
1 microjoule equals 1,000,000,000 femtojoules, using the exact defined conversion factor rather than an estimate.
How do I convert microjoule to femtojoule?
Multiply the microjoule value by 1000000000. The converter above does this instantly to whatever precision you set.
How do I convert femtojoule back to microjoule?
Use the reverse factor: 1 femtojoule equals 1e-9 microjoules. You can also use the swap control in the converter above to flip the direction instantly.
What is a microjoule?
Microjoule (uJ) is a unit of energy.
What is a femtojoule?
Femtojoule (fJ) is a unit of energy.
Is the microjoule to femtojoule conversion exact?
Yes. Both microjoule and femtojoule 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.