Rem is 0.01 sievert.
Rems to Kilosieverts Converter — rem to kSv
Convert Rem (rem) to Kilosievert (kSv) using the exact conversion factor (1 rem = 0.00001 kilosievert). See the formula, worked examples, conversion table, and common uses.
Rems to Kilosieverts 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.
Kilosievert is 1000 sievert units.
Result = input x 0.01 / 1000.
Equivalent Dose units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Rems to Kilosieverts
Rem and Kilosievert 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
kilosieverts = rems × 0.00001
This factor comes from each unit's defined relationship to the category's base unit: 1 rem equals 0.01 base units, and 1 kilosievert equals 1000 base units, so dividing one by the other gives the direct rem-to-kilosievert factor of 0.00001.
Simple example
1 rem × 0.00001 = 0.00001 kSv
1 rem = 0.00001 kilosieverts.
Real-world example
10 rem × 0.00001 = 0.0001 kSv
10 rems = 0.0001 kilosieverts.
Conversion table
| Rem (rem) | Kilosievert (kSv) |
|---|---|
| 0.001 rem | 1e-8 kSv |
| 0.01 rem | 1e-7 kSv |
| 0.1 rem | 0.000001 kSv |
| 1 rem | 0.00001 kSv |
| 10 rem | 0.0001 kSv |
| 100 rem | 0.001 kSv |
Reverse conversion: Kilosievert to Rem
0.00001 kSv × 100000 = 1 rem
0.00001 kilosieverts = 1 rem.
rems = kilosieverts × 100000
For a page dedicated to this direction, see Kilosievert 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 Kilosievert (kSv)
Kilosievert is 1000 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 kilosieverts are in 1 rem?
1 rem equals 0.00001 kilosieverts, using the exact defined conversion factor rather than an estimate.
How do I convert rem to kilosievert?
Multiply the rem value by 0.00001. The converter above does this instantly to whatever precision you set.
How do I convert kilosievert back to rem?
Use the reverse factor: 1 kilosievert equals 100,000 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 kilosievert?
Kilosievert (kSv) is a unit of radiation.
Is the rem to kilosievert 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