Grays to Millirads Converter
Enter the absorbed radiation dose in grays below to convert it to millirads.
Convert Grays to Millirads
Enter a value in grays (Gy) to convert to millirads (mrad).
Gray to Millirad Conversion Table
Table showing various gray measurements converted to millirads. Click any preset value or arrow to load it into the converter.
| Grays (Gy) | Millirads (mrad) |
|---|---|
| 1 Gy | 100,000 mrad |
| 2 Gy | 200,000 mrad |
| 2.5 Gy | 250,000 mrad |
| 5 Gy | 500,000 mrad |
| 10 Gy | 1,000,000 mrad |
| 15 Gy | 1,500,000 mrad |
| 20 Gy | 2,000,000 mrad |
| 25 Gy | 2,500,000 mrad |
| 30 Gy | 3,000,000 mrad |
| 50 Gy | 5,000,000 mrad |
How to Convert Grays to Millirads
To convert grays to millirads, multiply the absorbed radiation dose by the following conversion ratio: 100,000 millirads/gray.
Since one gray is equal to 100,000 millirads, you can use this simple formula to convert:
The absorbed radiation dose in millirads is equal to the absorbed radiation dose in grays multiplied by 100,000.
For example, here's how to convert 5 grays to millirads using the formula above.
How Many Millirads Are in a Gray?
There are 100,000 millirads in a gray, which is why we use this value in the formula above.
Our gray to millirad calculator automatically converts your absorbed radiation dose measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
Grays and millirads are both units used to measure absorbed radiation dose. Keep reading to learn more about each unit.
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. [1]
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.
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 grays (Gy) and millirads (mrad), keep full floating-point precision (1 Gy = 100,000 mrad; 1 mrad = 0.00001 Gy) during intermediate calculations and round only the final millirad figure to match your instrument tolerance.
More Gray & Millirad Conversions
Need to calculate in the opposite direction? Use our millirads to grays calculator to switch your starting unit immediately. You can also explore related tools such as converting millirads to grays, converting grays to centigrays, or converting grays to milligrays.
Frequently Asked Questions
References
- [1]NIST OWM StandardNIST OWM (SI Units — Length)·Radiation-Absorbed Dose Metrology Standard — Grays (Gy) to Millirads (mrad)
- [2]BIPM SpecificationBIPM (SI Base Unit: Metre (m))·Unit Specifications: Gray (Gy) & Millirad (mrad)
- [3]NIST HB 133 ReferenceNIST HB 133 (NIST Handbook 133 (2019 Ed.))·Conversion Factors & Mathematical Basis (Gy to mrad)