Megasievert is 1000000 sievert units.
Megasieverts to Nanosieverts Converter — MSv to nSv
Convert Megasievert (MSv) to Nanosievert (nSv) using the exact conversion factor (1 megasievert = 1e+15 nanosievert). See the formula, worked examples, and conversion table.
Megasieverts to Nanosieverts 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.
Nanosievert is 1e-9 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 Nanosieverts
Megasievert and Nanosievert 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 nanosievert is 1e-9 sievert units.
Formula
nanosieverts = megasieverts × 1e+15
This factor comes from each unit's defined relationship to the category's base unit: 1 megasievert equals 1000000 base units, and 1 nanosievert equals 1e-9 base units, so dividing one by the other gives the direct megasievert-to-nanosievert factor of 1e+15.
Simple example
1 MSv × 1e+15 = 1e+15 nSv
1 megasievert = 1e+15 nanosieverts.
Real-world example
10 MSv × 1e+15 = 1e+16 nSv
10 megasieverts = 1e+16 nanosieverts.
Conversion table
| Megasievert (MSv) | Nanosievert (nSv) |
|---|---|
| 0.001 MSv | 1,000,000,000,000 nSv |
| 0.01 MSv | 1e+13 nSv |
| 0.1 MSv | 1e+14 nSv |
| 1 MSv | 1e+15 nSv |
| 10 MSv | 1e+16 nSv |
| 100 MSv | 1e+17 nSv |
Reverse conversion: Nanosievert to Megasievert
1e+15 nSv × 1e-15 = 1 MSv
1e+15 nanosieverts = 1 megasieverts.
megasieverts = nanosieverts × 1e-15
For a page dedicated to this direction, see Nanosievert to Megasievert.
Understanding the Megasievert (MSv)
Megasievert is 1000000 sievert units.
Understanding the Nanosievert (nSv)
Nanosievert is 1e-9 sievert units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many nanosieverts are in 1 megasievert?
1 megasievert equals 1e+15 nanosieverts, using the exact defined conversion factor rather than an estimate.
How do I convert megasievert to nanosievert?
Multiply the megasievert value by 1e+15. The converter above does this instantly to whatever precision you set.
How do I convert nanosievert back to megasievert?
Use the reverse factor: 1 nanosievert equals 1e-15 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 nanosievert?
Nanosievert (nSv) is a unit of radiation.
Is the megasievert to nanosievert conversion exact?
Yes. Both megasievert and nanosievert are defined by fixed standards rather than physical artifacts, so the factor of 1e+15 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.