Kilosievert is 1000 sievert units.
Kilosieverts to Megasieverts Converter — kSv to MSv
Convert Kilosievert (kSv) to Megasievert (MSv) using the exact conversion factor (1 kilosievert = 0.001 megasievert). See the formula, worked examples, and conversion table.
Kilosieverts 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 1000 / 1e+6.
Equivalent Dose units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Kilosieverts to Megasieverts
Kilosievert 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: Kilosievert is 1000 sievert units, and megasievert is 1000000 sievert units.
Formula
megasieverts = kilosieverts × 0.001
This factor comes from each unit's defined relationship to the category's base unit: 1 kilosievert equals 1000 base units, and 1 megasievert equals 1000000 base units, so dividing one by the other gives the direct kilosievert-to-megasievert factor of 0.001.
Simple example
1 kSv × 0.001 = 0.001 MSv
1 kilosievert = 0.001 megasieverts.
Real-world example
10 kSv × 0.001 = 0.01 MSv
10 kilosieverts = 0.01 megasieverts.
Conversion table
| Kilosievert (kSv) | Megasievert (MSv) |
|---|---|
| 0.001 kSv | 0.000001 MSv |
| 0.01 kSv | 0.00001 MSv |
| 0.1 kSv | 0.0001 MSv |
| 1 kSv | 0.001 MSv |
| 10 kSv | 0.01 MSv |
| 100 kSv | 0.1 MSv |
Reverse conversion: Megasievert to Kilosievert
0.001 MSv × 1000 = 1 kSv
0.001 megasieverts = 1 kilosievert.
kilosieverts = megasieverts × 1000
For a page dedicated to this direction, see Megasievert to Kilosievert.
Understanding the Kilosievert (kSv)
Kilosievert is 1000 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 kilosievert?
1 kilosievert equals 0.001 megasieverts, using the exact defined conversion factor rather than an estimate.
How do I convert kilosievert to megasievert?
Multiply the kilosievert value by 0.001. The converter above does this instantly to whatever precision you set.
How do I convert megasievert back to kilosievert?
Use the reverse factor: 1 megasievert equals 1,000 kilosieverts. You can also use the swap control in the converter above to flip the direction instantly.
What is a kilosievert?
Kilosievert (kSv) is a unit of radiation.
What is a megasievert?
Megasievert (MSv) is a unit of radiation.
Is the kilosievert to megasievert conversion exact?
Yes. Both kilosievert and megasievert 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.