Millirads to Grays Converter
Enter the absorbed radiation dose in millirads below to convert it to grays.
Convert Millirads to Grays
Enter a value in millirads (mrad) to convert to grays (Gy).
Millirad to Gray Conversion Table
Table showing various millirad measurements converted to grays. Click any preset value or arrow to load it into the converter.
How to Convert Millirads to Grays
To convert millirads to grays, multiply the absorbed radiation dose by the following conversion ratio: 0.00001 grays/millirad.
Since one millirad is equal to 0.00001 grays, you can use this simple formula to convert:
The absorbed radiation dose in grays is equal to the absorbed radiation dose in millirads multiplied by 0.00001.
For example, here's how to convert 5 millirads to grays using the formula above.
How Many Grays Are in a Millirad?
There are 0.00001 grays in a millirad, which is why we use this value in the formula above.
Our millirad to gray calculator automatically converts your absorbed radiation dose measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
Millirads and grays 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 Gray?
SI derived unit of absorbed radiation dose (1 Gy = 1 J/kg = 100 rad). It serves as a primary reference unit for measuring absorbed radiation dose across scientific and practical applications. [2]
The gray is classified as an International System of Units (SI) unit of absorbed radiation dose. Grays can be abbreviated as Gy; for example, 1 gray can be written as 1 Gy.
As the primary coherent reference unit for absorbed radiation dose in this category, all other absorbed radiation dose units are mathematically anchored to the gray (Gy).
In practice, grays (Gy) are widely used across standard absorbed radiation dose applications within International System of Units (SI) workflows, engineering documentation, and technical data sheets.
When converting absorbed radiation dose between millirads (mrad) and grays (Gy), keep full floating-point precision (1 mrad = 0.00001 Gy; 1 Gy = 100,000 mrad) during intermediate calculations and round only the final gray figure to match your instrument tolerance.
More Millirad & Gray Conversions
Need to calculate in the opposite direction? Use our grays to millirads calculator to switch your starting unit immediately. You can also explore related tools such as converting grays to millirads, converting centigrays to grays, or converting milligrays to grays.
Frequently Asked Questions
References
- [1]NIST OWM StandardNIST OWM (SI Units — Length)·Radiation-Absorbed Dose Metrology Standard — Millirads (mrad) to Grays (Gy)
- [2]BIPM SpecificationBIPM (SI Base Unit: Metre (m))·Unit Specifications: Millirad (mrad) & Gray (Gy)
- [3]NIST HB 133 ReferenceNIST HB 133 (NIST Handbook 133 (2019 Ed.))·Conversion Factors & Mathematical Basis (mrad to Gy)