Rads to Millirads Converter
Enter the absorbed radiation dose in rads below to convert it to millirads.
Convert Rads to Millirads
Enter a value in rads (rad) to convert to millirads (mrad).
Rad to Millirad Conversion Table
Table showing various rad measurements converted to millirads. Click any preset value or arrow to load it into the converter.
| Rads (rad) | Millirads (mrad) |
|---|---|
| 1 rad | 1,000 mrad |
| 2 rad | 2,000 mrad |
| 2.5 rad | 2,500 mrad |
| 5 rad | 5,000 mrad |
| 10 rad | 10,000 mrad |
| 15 rad | 15,000 mrad |
| 20 rad | 20,000 mrad |
| 25 rad | 25,000 mrad |
| 30 rad | 30,000 mrad |
| 50 rad | 50,000 mrad |
How to Convert Rads to Millirads
To convert rads to millirads, multiply the absorbed radiation dose by the following conversion ratio: 1,000 millirads/rad.
Since one rad is equal to 1,000 millirads, you can use this simple formula to convert:
The absorbed radiation dose in millirads is equal to the absorbed radiation dose in rads multiplied by 1,000.
For example, here's how to convert 5 rads to millirads using the formula above.
How Many Millirads Are in a Rad?
There are 1,000 millirads in a rad, which is why we use this value in the formula above.
Our rad to millirad calculator automatically converts your absorbed radiation dose measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
Rads and millirads are both units used to measure absorbed radiation dose. Keep reading to learn more about each unit.
What Is a Rad?
A rad is a unit of absorbed radiation dose equal to 1/100 of a gray (0.01 Gy). CGS absorbed dose unit equal to 100 erg/g or 0.01 Gray (1 cGy). [1]
The rad is classified as a standard unit of absorbed radiation dose. Rads can be abbreviated as rad; for example, 1 rad can be written as 1 rad.
When working with rads (rad) in formulas or technical specifications, always verify whether your target system uses SI metric, US customary, or British imperial standards.
In practice, rads (rad) are widely used across fine-tolerance laboratory, analytical, and micro-scale absorbed radiation dose measurements within international standard workflows, engineering documentation, and technical data sheets.
What Is a Millirad?
A millirad is a unit of absorbed radiation dose equal to 1/100,000 of a gray (0.00001 Gy). One-thousandth of a rad (10 µGy). [2]
The millirad is classified as a standard unit of absorbed radiation dose. Millirads can be abbreviated as mrad; for example, 1 millirad can be written as 1 mrad.
In the metric system, "milli" is the standard SI prefix for thousandths, or 10⁻³. This makes the millirad (mrad) a convenient decimal multiple of the gray (Gy).
In practice, millirads (mrad) are widely used across fine-tolerance laboratory, analytical, and micro-scale absorbed radiation dose measurements within international standard workflows, engineering documentation, and technical data sheets.
When converting absorbed radiation dose between rads (rad) and millirads (mrad), keep full floating-point precision (1 rad = 1,000 mrad; 1 mrad = 0.001 rad) during intermediate calculations and round only the final millirad figure to match your instrument tolerance.
More Rad & Millirad Conversions
Need to calculate in the opposite direction? Use our millirads to rads calculator to switch your starting unit immediately. You can also explore related tools such as converting millirads to rads, converting grays to centigrays, or converting centigrays to grays.
Frequently Asked Questions
References
- [1]NIST OWM StandardNIST OWM (SI Units — Length)·Radiation-Absorbed Dose Metrology Standard — Rads (rad) to Millirads (mrad)
- [2]BIPM SpecificationBIPM (SI Base Unit: Metre (m))·Unit Specifications: Rad (Radiation Absorbed Dose) (rad) & Millirad (mrad)
- [3]NIST HB 133 ReferenceNIST HB 133 (NIST Handbook 133 (2019 Ed.))·Conversion Factors & Mathematical Basis (rad to mrad)