Sievert is equivalent dose.
Sieverts to Microsieverts Converter — Sv to uSv
Convert Sievert (Sv) to Microsievert (uSv) using the exact conversion factor (1 sievert = 1,000,000 microsievert). See the formula, worked examples, conversion table, history, and common uses.
Sieverts to Microsieverts 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.
Microsievert is 0.000001 sievert units.
Result = input x 1 / 1e-6.
Equivalent Dose units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Sieverts to Microsieverts
Sievert and Microsievert 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. Sievert is most often used for radiation safety dose limits for workers and the public.
Formula
microsieverts = sieverts × 1000000
This factor comes from each unit's defined relationship to the category's base unit: 1 sievert equals 1 base unit, and 1 microsievert equals 0.000001 base units, so dividing one by the other gives the direct sievert-to-microsievert factor of 1000000.
Simple example
1 Sv × 1000000 = 1,000,000 uSv
1 sievert = 1,000,000 microsieverts.
Real-world example
10 Sv × 1000000 = 10,000,000 uSv
10 sieverts = 10,000,000 microsieverts.
Conversion table
| Sievert (Sv) | Microsievert (uSv) |
|---|---|
| 0.001 Sv | 1,000 uSv |
| 0.01 Sv | 10,000 uSv |
| 0.1 Sv | 100,000 uSv |
| 1 Sv | 1,000,000 uSv |
| 10 Sv | 10,000,000 uSv |
| 100 Sv | 100,000,000 uSv |
Reverse conversion: Microsievert to Sievert
1 uSv × 0.000001 = 0.000001 Sv
1 microsievert = 0.000001 sieverts.
sieverts = microsieverts × 0.000001
For a page dedicated to this direction, see Microsievert to Sievert.
Understanding the Sievert
Sievert (Sv) measures equivalent radiation dose. The SI derived unit of equivalent radiation dose, weighting the physically absorbed dose (in gray) for how biologically damaging the specific type of radiation is. It is classified as a SI derived unit.
Where it's used: Universal — SI derived unit used worldwide in radiation protection
Sievert vs. gray. The gray measures physically absorbed radiation energy; the sievert adjusts that figure for biological harm, since equal absorbed doses of different radiation types (e.g. alpha particles vs. X-rays) can cause very different amounts of damage.
Uses of the Sievert today
- Radiation safety dose limits for workers and the public
- Medical imaging (CT scan, X-ray) dose reporting
- Background and environmental radiation exposure reporting
History of the Sievert
The sievert is named after Rolf Sievert (1896–1966), a Swedish medical physicist whose research on radiation measurement and safety standards was foundational to modern radiation protection practice; the unit was adopted by the CGPM in 1977.
Historical origin. Sievert was not the invention of a single named person; it developed through the process described above.
Understanding the Microsievert (uSv)
Microsievert is 0.000001 sievert units.
Sievert — sources
- BIPM SI Brochure, 9th edition — Official definition of the sievert as an SI derived unit.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many microsieverts are in 1 sievert?
1 sievert equals 1,000,000 microsieverts, using the exact defined conversion factor rather than an estimate.
How do I convert sievert to microsievert?
Multiply the sievert value by 1000000. The converter above does this instantly to whatever precision you set.
How do I convert microsievert back to sievert?
Use the reverse factor: 1 microsievert equals 0.000001 sieverts. You can also use the swap control in the converter above to flip the direction instantly.
What is a sievert?
Sievert (Sv) measures equivalent radiation dose. The SI derived unit of equivalent radiation dose, weighting the physically absorbed dose (in gray) for how biologically damaging the specific type of radiation is. It is classified as a SI derived unit.
What is a microsievert?
Microsievert (uSv) is a unit of radiation.
Is the sievert to microsievert conversion exact?
Yes. Both sievert and microsievert are defined by fixed standards rather than physical artifacts, so the factor of 1000000 used above is exact to as many digits as you choose to display.
What is the difference between sievert vs. gray?
The gray measures physically absorbed radiation energy; the sievert adjusts that figure for biological harm, since equal absorbed doses of different radiation types (e.g. alpha particles vs. X-rays) can cause very different amounts of damage.
Where is the sievert still used today?
Universal — SI derived unit used worldwide in radiation protection