Petasievert is 1000000000000000 sievert units.
Petasieverts to Millisieverts Converter — PSv to mSv
Convert Petasievert (PSv) to Millisievert (mSv) using the exact conversion factor (1 petasievert = 1e+18 millisievert). See the formula, worked examples, and conversion table.
Petasieverts to Millisieverts 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.
Millisievert is 0.001 sievert units.
Result = input x 1e+15 / 0.001.
Equivalent Dose units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Petasieverts to Millisieverts
Petasievert and Millisievert 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: Petasievert is 1000000000000000 sievert units, and millisievert is 0.001 sievert units.
Formula
millisieverts = petasieverts × 1e+18
This factor comes from each unit's defined relationship to the category's base unit: 1 petasievert equals 1e+15 base units, and 1 millisievert equals 0.001 base units, so dividing one by the other gives the direct petasievert-to-millisievert factor of 1e+18.
Simple example
1 PSv × 1e+18 = 1e+18 mSv
1 petasievert = 1e+18 millisieverts.
Real-world example
10 PSv × 1e+18 = 1e+19 mSv
10 petasieverts = 1e+19 millisieverts.
Conversion table
| Petasievert (PSv) | Millisievert (mSv) |
|---|---|
| 0.001 PSv | 1e+15 mSv |
| 0.01 PSv | 1e+16 mSv |
| 0.1 PSv | 1e+17 mSv |
| 1 PSv | 1e+18 mSv |
| 10 PSv | 1e+19 mSv |
| 100 PSv | 1e+20 mSv |
Reverse conversion: Millisievert to Petasievert
1e+18 mSv × 1e-18 = 1 PSv
1e+18 millisieverts = 1 petasievert.
petasieverts = millisieverts × 1e-18
For a page dedicated to this direction, see Millisievert to Petasievert.
Understanding the Petasievert (PSv)
Petasievert is 1000000000000000 sievert units.
Understanding the Millisievert (mSv)
Millisievert is 0.001 sievert units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many millisieverts are in 1 petasievert?
1 petasievert equals 1e+18 millisieverts, using the exact defined conversion factor rather than an estimate.
How do I convert petasievert to millisievert?
Multiply the petasievert value by 1e+18. The converter above does this instantly to whatever precision you set.
How do I convert millisievert back to petasievert?
Use the reverse factor: 1 millisievert equals 1e-18 petasieverts. You can also use the swap control in the converter above to flip the direction instantly.
What is a petasievert?
Petasievert (PSv) is a unit of radiation.
What is a millisievert?
Millisievert (mSv) is a unit of radiation.
Is the petasievert to millisievert conversion exact?
Yes. Both petasievert and millisievert are defined by fixed standards rather than physical artifacts, so the factor of 1e+18 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.