Milligrays to Grays Converter
Enter the absorbed radiation dose in milligrays below to convert it to grays.
Convert Milligrays to Grays
Enter a value in milligrays (mGy) to convert to grays (Gy).
Milligray to Gray Conversion Table
Table showing various milligray measurements converted to grays. Click any preset value or arrow to load it into the converter.
How to Convert Milligrays to Grays
To convert milligrays to grays, multiply the absorbed radiation dose by the following conversion ratio: 0.001 grays/milligray.
Since one milligray is equal to 0.001 grays, you can use this simple formula to convert:
The absorbed radiation dose in grays is equal to the absorbed radiation dose in milligrays multiplied by 0.001.
For example, here's how to convert 10 milligrays to grays using the formula above.
How Many Grays Are in a Milligray?
There are 0.001 grays in a milligray, which is why we use this value in the formula above.
Our milligray to gray calculator automatically converts your absorbed radiation dose measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
Milligrays and grays are both units used to measure absorbed radiation dose. Keep reading to learn more about each unit.
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). [1]
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.
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 milligrays (mGy) and grays (Gy), keep full floating-point precision (1 mGy = 0.001 Gy; 1 Gy = 1,000 mGy) during intermediate calculations and round only the final gray figure to match your instrument tolerance.
More Milligray & Gray Conversions
Need to calculate in the opposite direction? Use our grays to milligrays converter (Gy to mGy) to switch your starting unit immediately. You can also explore related tools such as converting centigrays to grays, converting micrograys to grays, or converting grays to centigrays.
Frequently Asked Questions
References
- [1]NIST OWM StandardNIST OWM (SI Units — Length)·Radiation-Absorbed Dose Metrology Standard — Milligrays (mGy) to Grays (Gy)
- [2]BIPM SpecificationBIPM (SI Base Unit: Metre (m))·Unit Specifications: Milligray (mGy) & Gray (Gy)
- [3]NIST HB 133 ReferenceNIST HB 133 (NIST Handbook 133 (2019 Ed.))·Conversion Factors & Mathematical Basis (mGy to Gy)