Rem is 0.01 sievert.
Rems to Nanosieverts Converter — rem to nSv
Convert Rem (rem) to Nanosievert (nSv) using the exact conversion factor (1 rem = 10,000,000 nanosievert). See the formula, worked examples, conversion table, and common uses.
Rems 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 0.01 / 1e-9.
Equivalent Dose units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Rems to Nanosieverts
Rem 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. Rem is most often used for us occupational radiation dose limits and monitoring.
Formula
nanosieverts = rems × 10000000
This factor comes from each unit's defined relationship to the category's base unit: 1 rem equals 0.01 base units, and 1 nanosievert equals 1e-9 base units, so dividing one by the other gives the direct rem-to-nanosievert factor of 10000000.
Simple example
1 rem × 10000000 = 10,000,000 nSv
1 rem = 10,000,000 nanosieverts.
Real-world example
10 rem × 10000000 = 100,000,000 nSv
10 rems = 100,000,000 nanosieverts.
Conversion table
| Rem (rem) | Nanosievert (nSv) |
|---|---|
| 0.001 rem | 10,000 nSv |
| 0.01 rem | 100,000 nSv |
| 0.1 rem | 1,000,000 nSv |
| 1 rem | 10,000,000 nSv |
| 10 rem | 100,000,000 nSv |
| 100 rem | 1,000,000,000 nSv |
Reverse conversion: Nanosievert to Rem
1 nSv × 1e-7 = 1e-7 rem
1 nanosievert = 1e-7 rems.
rems = nanosieverts × 1e-7
For a page dedicated to this direction, see Nanosievert 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 Nanosievert (nSv)
Nanosievert is 1e-9 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 nanosieverts are in 1 rem?
1 rem equals 10,000,000 nanosieverts, using the exact defined conversion factor rather than an estimate.
How do I convert rem to nanosievert?
Multiply the rem value by 10000000. The converter above does this instantly to whatever precision you set.
How do I convert nanosievert back to rem?
Use the reverse factor: 1 nanosievert equals 1e-7 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 nanosievert?
Nanosievert (nSv) is a unit of radiation.
Is the rem to nanosievert 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