Gigasievert is 1000000000 sievert units.
Gigasieverts to Megasieverts Converter — GSv to MSv
Convert Gigasievert (GSv) to Megasievert (MSv) using the exact conversion factor (1 gigasievert = 1,000 megasievert). See the formula, worked examples, and conversion table.
Gigasieverts to Megasieverts 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.
Megasievert is 1000000 sievert units.
Result = input x 1e+9 / 1e+6.
Equivalent Dose units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Gigasieverts to Megasieverts
Gigasievert and Megasievert 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: Gigasievert is 1000000000 sievert units, and megasievert is 1000000 sievert units.
Formula
megasieverts = gigasieverts × 1000
This factor comes from each unit's defined relationship to the category's base unit: 1 gigasievert equals 1000000000 base units, and 1 megasievert equals 1000000 base units, so dividing one by the other gives the direct gigasievert-to-megasievert factor of 1000.
Simple example
1 GSv × 1000 = 1,000 MSv
1 gigasievert = 1,000 megasieverts.
Real-world example
10 GSv × 1000 = 10,000 MSv
10 gigasieverts = 10,000 megasieverts.
Conversion table
| Gigasievert (GSv) | Megasievert (MSv) |
|---|---|
| 0.001 GSv | 1 MSv |
| 0.01 GSv | 10 MSv |
| 0.1 GSv | 100 MSv |
| 1 GSv | 1,000 MSv |
| 10 GSv | 10,000 MSv |
| 100 GSv | 100,000 MSv |
Reverse conversion: Megasievert to Gigasievert
1 MSv × 0.001 = 0.001 GSv
1 megasievert = 0.001 gigasieverts.
gigasieverts = megasieverts × 0.001
For a page dedicated to this direction, see Megasievert to Gigasievert.
Understanding the Gigasievert (GSv)
Gigasievert is 1000000000 sievert units.
Understanding the Megasievert (MSv)
Megasievert is 1000000 sievert units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many megasieverts are in 1 gigasievert?
1 gigasievert equals 1,000 megasieverts, using the exact defined conversion factor rather than an estimate.
How do I convert gigasievert to megasievert?
Multiply the gigasievert value by 1000. The converter above does this instantly to whatever precision you set.
How do I convert megasievert back to gigasievert?
Use the reverse factor: 1 megasievert equals 0.001 gigasieverts. You can also use the swap control in the converter above to flip the direction instantly.
What is a gigasievert?
Gigasievert (GSv) is a unit of radiation.
What is a megasievert?
Megasievert (MSv) is a unit of radiation.
Is the gigasievert to megasievert conversion exact?
Yes. Both gigasievert and megasievert are defined by fixed standards rather than physical artifacts, so the factor of 1000 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.