Millijoule is 0.001 joule units.
Millijoules to Nanojoules Converter — mJ to nJ
Convert Millijoule (mJ) to Nanojoule (nJ) using the exact conversion factor (1 millijoule = 1,000,000 nanojoule). See the formula, worked examples, and conversion table.
Millijoules to Nanojoules 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.
Nanojoule is 1e-9 joule units.
Result = input x 0.001 / 1e-9.
Energy uses the joule as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Millijoules to Nanojoules
Millijoule and Nanojoule both measure energy, and the conversion is especially useful for comparing nutrition labels (kilocalories) against scientific energy figures (joules). Specifically: Millijoule is 0.001 joule units, and nanojoule is 1e-9 joule units.
Formula
nanojoules = millijoules × 1000000
This factor comes from each unit's defined relationship to the category's base unit: 1 millijoule equals 0.001 base units, and 1 nanojoule equals 1e-9 base units, so dividing one by the other gives the direct millijoule-to-nanojoule factor of 1000000.
Simple example
1 mJ × 1000000 = 1,000,000 nJ
1 millijoule = 1,000,000 nanojoules.
Real-world example
100 mJ × 1000000 = 100,000,000 nJ
100 millijoules = 100,000,000 nanojoules.
Conversion table
| Millijoule (mJ) | Nanojoule (nJ) |
|---|---|
| 1 mJ | 1,000,000 nJ |
| 10 mJ | 10,000,000 nJ |
| 100 mJ | 100,000,000 nJ |
| 500 mJ | 500,000,000 nJ |
| 1,000 mJ | 1,000,000,000 nJ |
| 2,000 mJ | 2,000,000,000 nJ |
Reverse conversion: Nanojoule to Millijoule
1 nJ × 0.000001 = 0.000001 mJ
1 nanojoule = 0.000001 millijoules.
millijoules = nanojoules × 0.000001
For a page dedicated to this direction, see Nanojoule to Millijoule.
Understanding the Millijoule (mJ)
Millijoule is 0.001 joule units.
Understanding the Nanojoule (nJ)
Nanojoule is 1e-9 joule units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many nanojoules are in 1 millijoule?
1 millijoule equals 1,000,000 nanojoules, using the exact defined conversion factor rather than an estimate.
How do I convert millijoule to nanojoule?
Multiply the millijoule value by 1000000. The converter above does this instantly to whatever precision you set.
How do I convert nanojoule back to millijoule?
Use the reverse factor: 1 nanojoule equals 0.000001 millijoules. You can also use the swap control in the converter above to flip the direction instantly.
What is a millijoule?
Millijoule (mJ) is a unit of energy.
What is a nanojoule?
Nanojoule (nJ) is a unit of energy.
Is the millijoule to nanojoule conversion exact?
Yes. Both millijoule and nanojoule are defined by fixed standards rather than physical artifacts, so the factor of 1000000 used above is exact to as many digits as you choose to display.