Millirads to Rads Converter
Enter the absorbed radiation dose in millirads below to convert it to rads.
Convert Millirads to Rads
Enter a value in millirads (mrad) to convert to rads (rad).
Millirad to Rad Conversion Table
Table showing various millirad measurements converted to rads. Click any preset value or arrow to load it into the converter.
How to Convert Millirads to Rads
To convert millirads to rads, multiply the absorbed radiation dose by the following conversion ratio: 0.001 rads/millirad.
Since one millirad is equal to 0.001 rads, you can use this simple formula to convert:
The absorbed radiation dose in rads is equal to the absorbed radiation dose in millirads multiplied by 0.001.
For example, here's how to convert 5 millirads to rads using the formula above.
How Many Rads Are in a Millirad?
There are 0.001 rads in a millirad, which is why we use this value in the formula above.
Our millirad to rad calculator automatically converts your absorbed radiation dose measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
Millirads and rads are both units used to measure absorbed radiation dose. Keep reading to learn more about each unit.
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). [1]
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.
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). [2]
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.
When converting absorbed radiation dose between millirads (mrad) and rads (rad), keep full floating-point precision (1 mrad = 0.001 rad; 1 rad = 1,000 mrad) during intermediate calculations and round only the final rad figure to match your instrument tolerance.
More Millirad & Rad Conversions
Need to calculate in the opposite direction? Use our rads to millirads calculator to switch your starting unit immediately. You can also explore related tools such as converting rads to millirads, 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 — Millirads (mrad) to Rads (rad)
- [2]BIPM SpecificationBIPM (SI Base Unit: Metre (m))·Unit Specifications: Millirad (mrad) & Rad (Radiation Absorbed Dose) (rad)
- [3]NIST HB 133 ReferenceNIST HB 133 (NIST Handbook 133 (2019 Ed.))·Conversion Factors & Mathematical Basis (mrad to rad)