Quectojoule is 1e-30 joule units.
Quectojoules to Millijoules Converter — qJ to mJ
Convert Quectojoule (qJ) to Millijoule (mJ) using the exact conversion factor (1 quectojoule = 1e-27 millijoule). See the formula, worked examples, and conversion table.
Quectojoules to Millijoules 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.
Millijoule is 0.001 joule units.
Result = input x 1e-30 / 0.001.
Energy uses the joule as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Quectojoules to Millijoules
Quectojoule and Millijoule both measure energy, and the conversion is especially useful for comparing nutrition labels (kilocalories) against scientific energy figures (joules). Specifically: Quectojoule is 1e-30 joule units, and millijoule is 0.001 joule units.
Formula
millijoules = quectojoules × 1e-27
This factor comes from each unit's defined relationship to the category's base unit: 1 quectojoule equals 1e-30 base units, and 1 millijoule equals 0.001 base units, so dividing one by the other gives the direct quectojoule-to-millijoule factor of 1e-27.
Simple example
1 qJ × 1e-27 = 1e-27 mJ
1 quectojoule = 1e-27 millijoules.
Real-world example
100 qJ × 1e-27 = 1e-25 mJ
100 quectojoules = 1e-25 millijoules.
Conversion table
| Quectojoule (qJ) | Millijoule (mJ) |
|---|---|
| 1 qJ | 1e-27 mJ |
| 10 qJ | 1e-26 mJ |
| 100 qJ | 1e-25 mJ |
| 500 qJ | 5e-25 mJ |
| 1,000 qJ | 1e-24 mJ |
| 2,000 qJ | 2e-24 mJ |
Reverse conversion: Millijoule to Quectojoule
1e-27 mJ × 1e+27 = 1 qJ
1e-27 millijoules = 1 quectojoule.
quectojoules = millijoules × 1e+27
For a page dedicated to this direction, see Millijoule to Quectojoule.
Understanding the Quectojoule (qJ)
Quectojoule is 1e-30 joule units.
Understanding the Millijoule (mJ)
Millijoule is 0.001 joule units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many millijoules are in 1 quectojoule?
1 quectojoule equals 1e-27 millijoules, using the exact defined conversion factor rather than an estimate.
How do I convert quectojoule to millijoule?
Multiply the quectojoule value by 1e-27. The converter above does this instantly to whatever precision you set.
How do I convert millijoule back to quectojoule?
Use the reverse factor: 1 millijoule equals 1e+27 quectojoules. You can also use the swap control in the converter above to flip the direction instantly.
What is a quectojoule?
Quectojoule (qJ) is a unit of energy.
What is a millijoule?
Millijoule (mJ) is a unit of energy.
Is the quectojoule to millijoule conversion exact?
Yes. Both quectojoule and millijoule 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.