Nanojoules to Millijoules Converter
Enter the energy in nanojoules below to convert it to millijoules.
Convert Nanojoules to Millijoules
Enter a value in nanojoules (nJ) to convert to millijoules (mJ).
Nanojoule to Millijoule Conversion Table
Table showing various nanojoule measurements converted to millijoules. Click any preset value or arrow to load it into the converter.
| Nanojoules (nJ) | Millijoules (mJ) |
|---|---|
| 1 nJ | 0.000001 mJ |
| 10 nJ | 0.00001 mJ |
| 100 nJ | 0.0001 mJ |
| 1,000 nJ | 0.001 mJ |
| 10,000 nJ | 0.01 mJ |
| 100,000 nJ | 0.1 mJ |
| 1,000,000 nJ | 1 mJ |
| 5,000,000 nJ | 5 mJ |
| 10,000,000 nJ | 10 mJ |
| 25,400,000 nJ | 25.4 mJ |
How to Convert Nanojoules to Millijoules
To convert nanojoules to millijoules, multiply the energy by the following conversion ratio: 0.000001 millijoules/nanojoule.
Since one nanojoule is equal to 0.000001 millijoules, you can use this simple formula to convert:
The energy in millijoules is equal to the energy in nanojoules multiplied by 0.000001.
For example, here's how to convert 5 nanojoules to millijoules using the formula above.
How Many Millijoules Are in a Nanojoule?
There are 0.000001 millijoules in a nanojoule, which is why we use this value in the formula above.
Our nanojoule to millijoule calculator automatically converts your energy measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
Nanojoules and millijoules are both units used to measure energy. Keep reading to learn more about each unit.
What Is a Nanojoule?
A nanojoule is a unit of energy equal to 1/1,000,000,000 of a joule (1e-9 J). One-billionth of a Joule. [1]
The nanojoule is classified as a metric and SI-compatible unit of energy. Nanojoules can be abbreviated as nJ; for example, 1 nanojoule can be written as 1 nJ.
In the metric system, "nano" is the standard SI prefix for billionths, or 10⁻⁹. This makes the nanojoule (nJ) a convenient decimal multiple of the joule (J).
In practice, nanojoules (nJ) are widely used across fine-tolerance laboratory, analytical, and micro-scale energy measurements within SI metric workflows, engineering documentation, and technical data sheets.
What Is a Millijoule?
A millijoule is a unit of energy equal to 1/1,000 of a joule (0.001 J). One-thousandth of a Joule. [2]
The millijoule is classified as a metric and SI-compatible unit of energy. Millijoules can be abbreviated as mJ; for example, 1 millijoule can be written as 1 mJ.
In the metric system, "milli" is the standard SI prefix for thousandths, or 10⁻³. This makes the millijoule (mJ) a convenient decimal multiple of the joule (J).
In practice, millijoules (mJ) are widely used across fine-tolerance laboratory, analytical, and micro-scale energy measurements within SI metric workflows, engineering documentation, and technical data sheets.
When converting energy between nanojoules (nJ) and millijoules (mJ), keep full floating-point precision (1 nJ = 0.000001 mJ; 1 mJ = 1,000,000 nJ) during intermediate calculations and round only the final millijoule figure to match your instrument tolerance.
More Nanojoule & Millijoule Conversions
Need to calculate in the opposite direction? Use our millijoules to nanojoules calculator to switch your starting unit immediately. You can also explore related tools such as converting millijoules to nanojoules, converting joules to calories, or converting calories to joules.
Convert from Nanojoules
Frequently Asked Questions
References
- [1]NIST CODATA StandardNIST CODATA (CODATA Energy & Thermodynamic Constants)·Energy Metrology Standard — Nanojoules (nJ) to Millijoules (mJ)
- [2]NIST SP 811 SpecificationNIST SP 811 (NIST SP 811 App. B.9 (Energy, Work & Heat))·Unit Specifications: Nanojoule (nJ) & Millijoule (mJ)
- [3]BIPM ReferenceBIPM (Derived SI Unit: Joule (J))·Conversion Factors & Mathematical Basis (nJ to mJ)