Erg to Millijoule Converter
Convert Erg (erg) to Millijoule (mJ) instantly. 1 erg = 1.000000e-4 mJ.
Energy Converter
27 units available
1 erg = 1.000000e-4 mJ
Formula:
mJ = erg × 0.0001With your value: 1 erg = 1.000000e-4 mJ
How big is that?
Everyday references on a logarithmic scale, all expressed in erg so you can sanity-check the result.
Other Erg to Millijoule conversions
Erg to Millijoule Conversion Table
| Erg (erg) | Millijoule (mJ) |
|---|---|
| 0.5 | 5.000000e-5 |
| 1 | 1.000000e-4 |
| 2 | 0.0002 |
| 5 | 0.0005 |
| 10 | 0.001 |
| 15 | 0.0015 |
| 20 | 0.002 |
| 25 | 0.0025 |
| 50 | 0.005 |
| 100 | 0.01 |
| 250 | 0.025 |
| 500 | 0.05 |
| 1000 | 0.1 |
Millijoule to Erg Conversion Table
| Millijoule (mJ) | Erg (erg) |
|---|---|
| 0.5 | 5,000 |
| 1 | 10,000 |
| 2 | 20,000 |
| 5 | 50,000 |
| 10 | 100,000 |
| 15 | 150,000 |
| 20 | 200,000 |
| 25 | 250,000 |
| 50 | 500,000 |
| 100 | 1,000,000 |
| 250 | 2,500,000 |
| 500 | 5,000,000 |
| 1000 | 10,000,000 |
Where these values come from
Every factor on this page is traced to the document that defines it. See the full provenance dataset or our methodology.
Erg (erg)
Energy
Derived from the joule (1 J = 1 kg·m²/s²). Thermochemical and IT calories, BTU and kWh are exact defined multiples.
Source: NIST Special Publication 811, Guide for the Use of the International System of Units
National Institute of Standards and Technology (US) · Reviewed 2026-07-01
Millijoule (mJ)
Energy
Derived from the joule (1 J = 1 kg·m²/s²). Thermochemical and IT calories, BTU and kWh are exact defined multiples.
Source: NIST Special Publication 811, Guide for the Use of the International System of Units
National Institute of Standards and Technology (US) · Reviewed 2026-07-01
How to Convert Erg to Millijoule
To convert from Erg (erg) to Millijoule (mJ), multiply the value by 1.000000e-4.
Formula: mJ = erg × 0.0001
Reverse: erg = mJ × 10,000
Step-by-Step Example
- Start with your value in Erg. For example: 5 erg
- Multiply by the conversion factor: 5 x 1.000000e-4
- The result is: 0.0005 mJ
About Erg
The erg (erg) is a unit of energy and work. One erg equals 1.000000 × 10^-7 joules. UnitConvertLab converts it against every other energy unit using this exact definition, so results are reproducible to full double precision rather than rounded lookup tables.
Common uses: energy calculations, engineering and science, education.
About Millijoule
The millijoule (mJ) is a unit of energy and work. One millijoule equals 0.001 joules. UnitConvertLab converts it against every other energy unit using this exact definition, so results are reproducible to full double precision rather than rounded lookup tables.
Common uses: energy calculations, engineering and science, education.
Frequently Asked Questions
How many Millijoule are in 1 Erg?
There are exactly 1.000000e-4 Millijoule in 1 Erg. This means the conversion factor from Erg to Millijoule is 1.000000e-4.
What is the formula to convert Erg to Millijoule?
The formula to convert Erg to Millijoule is: mJ = erg × 0.0001. For example, to convert 10 Erg to Millijoule, you would multiply 10 by 1.000000e-4.
What is a Erg?
The erg (erg) is a unit of energy and work. One erg equals 1.000000 × 10^-7 joules. UnitConvertLab converts it against every other energy unit using this exact definition, so results are reproducible to full double precision rather than rounded lookup tables.
What is a Millijoule?
The millijoule (mJ) is a unit of energy and work. One millijoule equals 0.001 joules. UnitConvertLab converts it against every other energy unit using this exact definition, so results are reproducible to full double precision rather than rounded lookup tables.
What are the common uses of Erg?
The Erg is commonly used in energy calculations, engineering and science, education.
Related Energy Conversions
Cite this page
UnitConvertLab. (2026). Erg to Millijoule converter. UnitConvertLab. Retrieved from https://unitconvertlab.com/convert/erg-to-millijoule