Grays to Milligrays Converter
Enter the absorbed radiation dose in grays below to convert it to milligrays.
Convert Grays to Milligrays
Enter a value in grays (Gy) to convert to milligrays (mGy).
Gray to Milligray Conversion Table
Table showing various gray measurements converted to milligrays. Click any preset value or arrow to load it into the converter.
| Grays (Gy) | Milligrays (mGy) |
|---|---|
| 1 Gy | 1,000 mGy |
| 2 Gy | 2,000 mGy |
| 5 Gy | 5,000 mGy |
| 10 Gy | 10,000 mGy |
| 15 Gy | 15,000 mGy |
| 20 Gy | 20,000 mGy |
| 25 Gy | 25,000 mGy |
| 30 Gy | 30,000 mGy |
| 50 Gy | 50,000 mGy |
| 75 Gy | 75,000 mGy |
How to Convert Grays to Milligrays
To convert grays to milligrays, multiply the absorbed radiation dose by the following conversion ratio: 1,000 milligrays/gray.
Since one gray is equal to 1,000 milligrays, you can use this simple formula to convert:
The absorbed radiation dose in milligrays is equal to the absorbed radiation dose in grays multiplied by 1,000.
For example, here's how to convert 10 grays to milligrays using the formula above.
How Many Milligrays Are in a Gray?
There are 1,000 milligrays in a gray, which is why we use this value in the formula above.
Our gray to milligray calculator automatically converts your absorbed radiation dose measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
Grays and milligrays 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 Milligray?
A milligray is a unit of absorbed radiation dose equal to 1/1,000 of a gray (0.001 Gy). CT scan & diagnostic radiography absorbed dose unit (0.001 Gy). [2]
The milligray is classified as a metric and SI-compatible unit of absorbed radiation dose. Milligrays can be abbreviated as mGy; for example, 1 milligray can be written as 1 mGy.
In the metric system, "milli" is the standard SI prefix for thousandths, or 10⁻³. This makes the milligray (mGy) a convenient decimal multiple of the gray (Gy).
In practice, milligrays (mGy) are widely used across fine-tolerance laboratory, analytical, and micro-scale absorbed radiation dose measurements within SI metric workflows, engineering documentation, and technical data sheets.
When converting absorbed radiation dose between grays (Gy) and milligrays (mGy), keep full floating-point precision (1 Gy = 1,000 mGy; 1 mGy = 0.001 Gy) during intermediate calculations and round only the final milligray figure to match your instrument tolerance.
More Gray & Milligray Conversions
Need to calculate in the opposite direction? Use our milligrays to grays converter (mGy to Gy) to switch your starting unit immediately. You can also explore related tools such as converting grays to centigrays, converting grays to micrograys, or converting centigrays to grays.
Frequently Asked Questions
References
- [1]NIST OWM StandardNIST OWM (SI Units — Length)·Radiation-Absorbed Dose Metrology Standard — Grays (Gy) to Milligrays (mGy)
- [2]BIPM SpecificationBIPM (SI Base Unit: Metre (m))·Unit Specifications: Gray (Gy) & Milligray (mGy)
- [3]NIST HB 133 ReferenceNIST HB 133 (NIST Handbook 133 (2019 Ed.))·Conversion Factors & Mathematical Basis (Gy to mGy)