Millisievert is 0.001 sievert units.
Millisievert to Gray
Convert Millisievert (mSv) to Gray (Gy) instantly. Free online radiation converter with formulas, tables and examples.
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Radiation Converter
Convert radioactivity, absorbed dose, and equivalent dose units by compatible radiation family.
Context values
Some unit families need one extra value for a physically accurate result.
Gray is absorbed dose in joules per kilogram.
Gy = mSv × 0.001
Results update instantly for Millisievert to Gray conversions.
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Formula
1 Millisievert = 0.001 Gray
Gy = mSv × 0.001
mSv = Gy ÷ 0.001
Conversion table
| 1 mSv | 0.001 Gy |
| 2 mSv | 0.002 Gy |
| 5 mSv | 0.005 Gy |
| 10 mSv | 0.01 Gy |
| 20 mSv | 0.02 Gy |
| 50 mSv | 0.05 Gy |
| 100 mSv | 0.1 Gy |
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Frequently asked questions
How many Grays are in one Millisievert?
One Millisievert equals 0.001 Grays.
How do I convert Millisievert to Gray?
Multiply the number of Millisieverts by 0.001 to get Grays. To go the other way, multiply Grays by 1000 (or divide by 0.001) to get Millisieverts.
Is this conversion exact?
Yes. This conversion uses the exact defined relationship between Millisievert and Gray, so the result shown is mathematically precise (rounded only for display).
When is Millisievert to Gray conversion commonly used?
It is commonly used in nuclear medicine, radiation safety, health physics, and scientific research involving radioactivity and radiation dose.
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About this conversion
Millisievert and Gray are units used in the radiation family of measurements. Millisievert measures equivalent radiation dose (biological risk-weighted dose), while Gray measures absorbed radiation dose (energy deposited per unit mass). This page provides the direct numeric ratio between the two units. This converter uses the precise relationship 1 Millisievert = 0.001 Grays (equivalently 1 Gray = 1000 Millisieverts), so results stay accurate for nuclear medicine, radiation safety, health physics, and scientific research.