Rem is 0.01 sievert.
Rems to Microsieverts Converter — rem to uSv
Convert Rem (rem) to Microsievert (uSv) using the exact conversion factor (1 rem = 10,000 microsievert). See the formula, worked examples, conversion table, and common uses.
Rems 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 0.01 / 1e-6.
Equivalent Dose units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Rems to Microsieverts
Rem 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. Rem is most often used for us occupational radiation dose limits and monitoring.
Formula
microsieverts = rems × 10000
This factor comes from each unit's defined relationship to the category's base unit: 1 rem equals 0.01 base units, and 1 microsievert equals 0.000001 base units, so dividing one by the other gives the direct rem-to-microsievert factor of 10000.
Simple example
1 rem × 10000 = 10,000 uSv
1 rem = 10,000 microsieverts.
Real-world example
10 rem × 10000 = 100,000 uSv
10 rems = 100,000 microsieverts.
Conversion table
| Rem (rem) | Microsievert (uSv) |
|---|---|
| 0.001 rem | 10 uSv |
| 0.01 rem | 100 uSv |
| 0.1 rem | 1,000 uSv |
| 1 rem | 10,000 uSv |
| 10 rem | 100,000 uSv |
| 100 rem | 1,000,000 uSv |
Reverse conversion: Microsievert to Rem
1 uSv × 0.0001 = 0.0001 rem
1 microsievert = 0.0001 rems.
rems = microsieverts × 0.0001
For a page dedicated to this direction, see Microsievert to Rem.
Understanding the Rem
Rem (rem) measures equivalent radiation dose. 'Roentgen equivalent man' — the US customary unit of equivalent radiation dose, fixed at exactly 0.01 sievert. It is classified as a non-SI unit, still common in the US.
Where it's used: Still widely used in the United States alongside the SI sievert
Rem vs. sievert. Both measure equivalent radiation dose; the sievert is the modern SI unit while the rem is the older US customary unit, related by 1 sievert = 100 rem exactly.
Uses of the Rem today
- US occupational radiation dose limits and monitoring
- US nuclear regulatory reporting
- US medical radiation dose records
Understanding the Microsievert (uSv)
Microsievert is 0.000001 sievert units.
Rem — sources
- US NRC (Nuclear Regulatory Commission) — glossary — Definition and continued regulatory use of the rem in the United States.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many microsieverts are in 1 rem?
1 rem equals 10,000 microsieverts, using the exact defined conversion factor rather than an estimate.
How do I convert rem to microsievert?
Multiply the rem value by 10000. The converter above does this instantly to whatever precision you set.
How do I convert microsievert back to rem?
Use the reverse factor: 1 microsievert equals 0.0001 rems. You can also use the swap control in the converter above to flip the direction instantly.
What is a rem?
Rem (rem) measures equivalent radiation dose. 'Roentgen equivalent man' — the US customary unit of equivalent radiation dose, fixed at exactly 0.01 sievert. It is classified as a non-SI unit, still common in the US.
What is a microsievert?
Microsievert (uSv) is a unit of radiation.
Is the rem to microsievert conversion exact?
Yes. 'Roentgen equivalent man' — the US customary unit of equivalent radiation dose, fixed at exactly 0.01 sievert. That fixed definition is what the converter above uses, so any rounding you see is a display choice, not a limitation of the math.
What is the difference between rem vs. sievert?
Both measure equivalent radiation dose; the sievert is the modern SI unit while the rem is the older US customary unit, related by 1 sievert = 100 rem exactly.
Where is the rem still used today?
Still widely used in the United States alongside the SI sievert