Gray to Milligray Converter
Convert Gray (Gy) to Milligray (mGy) instantly. 1 Gy = 1,000 mGy.
Radiation Converter
10 units available
1 Gy = 1,000 mGy
Formula:
mGy = Gy × 1,000With your value: 1 Gy = 1,000 mGy
Other Gray to Milligray conversions
Gray to Milligray Conversion Table
| Gray (Gy) | Milligray (mGy) |
|---|---|
| 0.5 | 500 |
| 1 | 1,000 |
| 2 | 2,000 |
| 5 | 5,000 |
| 10 | 10,000 |
| 15 | 15,000 |
| 20 | 20,000 |
| 25 | 25,000 |
| 50 | 50,000 |
| 100 | 100,000 |
| 250 | 250,000 |
| 500 | 500,000 |
| 1000 | 1,000,000 |
Milligray to Gray Conversion Table
| Milligray (mGy) | Gray (Gy) |
|---|---|
| 0.5 | 0.0005 |
| 1 | 0.001 |
| 2 | 0.002 |
| 5 | 0.005 |
| 10 | 0.01 |
| 15 | 0.015 |
| 20 | 0.02 |
| 25 | 0.025 |
| 50 | 0.05 |
| 100 | 0.1 |
| 250 | 0.25 |
| 500 | 0.5 |
| 1000 | 1 |
Where these values come from
Every factor on this page is traced to the document that defines it. See the full provenance dataset or our methodology.
Gray (Gy)
Radiation
Gray and sievert are coherent SI units (J/kg). Rad and rem are exactly 0.01 Gy and 0.01 Sv; the curie is exactly 3.7 × 10¹⁰ Bq.
Source: BIPM, The International System of Units (SI), 9th edition, 2019 (updated 2024)
Bureau International des Poids et Mesures · Reviewed 2026-07-01
Milligray (mGy)
Radiation
Gray and sievert are coherent SI units (J/kg). Rad and rem are exactly 0.01 Gy and 0.01 Sv; the curie is exactly 3.7 × 10¹⁰ Bq.
Source: BIPM, The International System of Units (SI), 9th edition, 2019 (updated 2024)
Bureau International des Poids et Mesures · Reviewed 2026-07-01
How to Convert Gray to Milligray
To convert from Gray (Gy) to Milligray (mGy), multiply the value by 1,000.
Formula: mGy = Gy × 1,000
Reverse: Gy = mGy × 0.001
Step-by-Step Example
- Start with your value in Gray. For example: 5 Gy
- Multiply by the conversion factor: 5 x 1,000
- The result is: 5,000 mGy
About Gray
The gray (Gy) is the SI unit of absorbed radiation dose. It measures the amount of energy deposited in a mass of matter by ionizing radiation.
Common uses: medicine, nuclear physics, radiotherapy.
About Milligray
The milligray (mGy) is a unit of radiation dose. One milligray equals 0.001 grays. UnitConvertLab converts it against every other radiation unit using this exact definition, so results are reproducible to full double precision rather than rounded lookup tables.
Common uses: radiation calculations, engineering and science, education.
Frequently Asked Questions
How many Milligray are in 1 Gray?
There are exactly 1,000 Milligray in 1 Gray. This means the conversion factor from Gray to Milligray is 1,000.
What is the formula to convert Gray to Milligray?
The formula to convert Gray to Milligray is: mGy = Gy × 1,000. For example, to convert 10 Gray to Milligray, you would multiply 10 by 1,000.
What is a Gray?
The gray (Gy) is the SI unit of absorbed radiation dose. It measures the amount of energy deposited in a mass of matter by ionizing radiation.
What is a Milligray?
The milligray (mGy) is a unit of radiation dose. One milligray equals 0.001 grays. UnitConvertLab converts it against every other radiation unit using this exact definition, so results are reproducible to full double precision rather than rounded lookup tables.
What are the common uses of Gray?
The Gray is commonly used in medicine, nuclear physics, radiotherapy.
Related Radiation Conversions
Cite this page
UnitConvertLab. (2026). Gray to Milligray converter. UnitConvertLab. Retrieved from https://unitconvertlab.com/convert/gray-to-milligray