Megasievert is 1000000 sievert units.
Megasieverts to Gigasieverts Converter — MSv to GSv
Convert Megasievert (MSv) to Gigasievert (GSv) using the exact conversion factor (1 megasievert = 0.001 gigasievert). See the formula, worked examples, and conversion table.
Megasieverts to Gigasieverts converter
Converter
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.
Gigasievert is 1000000000 sievert units.
Result = input x 1e+6 / 1e+9.
Equivalent Dose units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Megasieverts to Gigasieverts
Megasievert and Gigasievert both belong to the radiation-measurement family, though radiation quantities fall into genuinely distinct categories: absorbed dose (gray, rad) measures energy deposited in matter, equivalent dose (sievert, rem) weights that for biological harm, and activity (becquerel, curie) measures how often a radioactive source decays — this page only converts between units of the same kind. Specifically: Megasievert is 1000000 sievert units, and gigasievert is 1000000000 sievert units.
Formula
gigasieverts = megasieverts × 0.001
This factor comes from each unit's defined relationship to the category's base unit: 1 megasievert equals 1000000 base units, and 1 gigasievert equals 1000000000 base units, so dividing one by the other gives the direct megasievert-to-gigasievert factor of 0.001.
Simple example
1 MSv × 0.001 = 0.001 GSv
1 megasievert = 0.001 gigasieverts.
Real-world example
10 MSv × 0.001 = 0.01 GSv
10 megasieverts = 0.01 gigasieverts.
Conversion table
| Megasievert (MSv) | Gigasievert (GSv) |
|---|---|
| 0.001 MSv | 0.000001 GSv |
| 0.01 MSv | 0.00001 GSv |
| 0.1 MSv | 0.0001 GSv |
| 1 MSv | 0.001 GSv |
| 10 MSv | 0.01 GSv |
| 100 MSv | 0.1 GSv |
Reverse conversion: Gigasievert to Megasievert
0.001 GSv × 1000 = 1 MSv
0.001 gigasieverts = 1 megasievert.
megasieverts = gigasieverts × 1000
For a page dedicated to this direction, see Gigasievert to Megasievert.
Understanding the Megasievert (MSv)
Megasievert is 1000000 sievert units.
Understanding the Gigasievert (GSv)
Gigasievert is 1000000000 sievert units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many gigasieverts are in 1 megasievert?
1 megasievert equals 0.001 gigasieverts, using the exact defined conversion factor rather than an estimate.
How do I convert megasievert to gigasievert?
Multiply the megasievert value by 0.001. The converter above does this instantly to whatever precision you set.
How do I convert gigasievert back to megasievert?
Use the reverse factor: 1 gigasievert equals 1,000 megasieverts. You can also use the swap control in the converter above to flip the direction instantly.
What is a megasievert?
Megasievert (MSv) is a unit of radiation.
What is a gigasievert?
Gigasievert (GSv) is a unit of radiation.
Is the megasievert to gigasievert conversion exact?
Yes. Both megasievert and gigasievert are defined by fixed standards rather than physical artifacts, so the factor of 0.001 used above is exact to as many digits as you choose to display.
What's the difference between absorbed dose, equivalent dose, and activity?
Absorbed dose (gray, rad) measures the energy radiation deposits in matter. Equivalent dose (sievert, rem) adjusts that figure for how harmful different types of radiation are to biological tissue. Activity (becquerel, curie) measures how often a radioactive source decays, independent of how much dose a person actually receives from it.