Millijoules to Nanojoules Converter
Enter the energy in millijoules below to convert it to nanojoules.
Convert Millijoules to Nanojoules
Enter a value in millijoules (mJ) to convert to nanojoules (nJ).
Millijoule to Nanojoule Conversion Table
Table showing various millijoule measurements converted to nanojoules. Click any preset value or arrow to load it into the converter.
How to Convert Millijoules to Nanojoules
To convert millijoules to nanojoules, multiply the energy by the following conversion ratio: 1,000,000 nanojoules/millijoule.
Since one millijoule is equal to 1,000,000 nanojoules, you can use this simple formula to convert:
The energy in nanojoules is equal to the energy in millijoules multiplied by 1,000,000.
For example, here's how to convert 5 millijoules to nanojoules using the formula above.
How Many Nanojoules Are in a Millijoule?
There are 1,000,000 nanojoules in a millijoule, which is why we use this value in the formula above.
Our millijoule to nanojoule calculator automatically converts your energy measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
Millijoules and nanojoules are both units used to measure energy. Keep reading to learn more about each unit.
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. [1]
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.
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. [2]
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.
When converting energy between millijoules (mJ) and nanojoules (nJ), keep full floating-point precision (1 mJ = 1,000,000 nJ; 1 nJ = 0.000001 mJ) during intermediate calculations and round only the final nanojoule figure to match your instrument tolerance.
More Millijoule & Nanojoule Conversions
Need to calculate in the opposite direction? Use our nanojoules to millijoules calculator to switch your starting unit immediately. You can also explore related tools such as converting nanojoules to millijoules, converting joules to calories, or converting calories to joules.
Convert from Millijoules
Frequently Asked Questions
References
- [1]NIST CODATA StandardNIST CODATA (CODATA Energy & Thermodynamic Constants)·Energy Metrology Standard — Millijoules (mJ) to Nanojoules (nJ)
- [2]NIST SP 811 SpecificationNIST SP 811 (NIST SP 811 App. B.9 (Energy, Work & Heat))·Unit Specifications: Millijoule (mJ) & Nanojoule (nJ)
- [3]BIPM ReferenceBIPM (Derived SI Unit: Joule (J))·Conversion Factors & Mathematical Basis (mJ to nJ)