Gray to Millisievert Converter
Convert Gray (Gy) to Millisievert (mSv) instantly. 1 Gy = 1,000 mSv.
Radiation Converter
10 units available
1 Gy = 1,000 mSv
Formula:
mSv = Gy × 1,000With your value: 1 Gy = 1,000 mSv
Other Gray to Millisievert conversions
Gray to Millisievert Conversion Table
| Gray (Gy) | Millisievert (mSv) |
|---|---|
| 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 |
Millisievert to Gray Conversion Table
| Millisievert (mSv) | 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
Millisievert (mSv)
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 Millisievert
To convert from Gray (Gy) to Millisievert (mSv), multiply the value by 1,000.
Formula: mSv = Gy × 1,000
Reverse: Gy = mSv × 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 mSv
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 Millisievert
The millisievert (mSv) is a unit of radiation dose. One millisievert 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 Millisievert are in 1 Gray?
There are exactly 1,000 Millisievert in 1 Gray. This means the conversion factor from Gray to Millisievert is 1,000.
What is the formula to convert Gray to Millisievert?
The formula to convert Gray to Millisievert is: mSv = Gy × 1,000. For example, to convert 10 Gray to Millisievert, 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 Millisievert?
The millisievert (mSv) is a unit of radiation dose. One millisievert 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 Millisievert converter. UnitConvertLab. Retrieved from https://unitconvertlab.com/convert/gray-to-millisievert