Convert Millisieverts (mSv) to Millirems (mrem)
Radiation dose reports switch units at the Atlantic: millisieverts (mSv) in most of the world, millirems (mrem) in the US. 1 mSv = 100 mrem exactly.
Formula
1 mSv = 100 mrem
To convert mSv to mrem, multiply the value by 100.
Conversion Table
| Millisieverts (mSv) | Millirems (mrem) |
|---|---|
| 0.01 mSv | 1 mrem |
| 0.05 mSv | 5 mrem |
| 0.1 mSv | 10 mrem |
| 0.4 mSv | 40 mrem |
| 1 mSv | 100 mrem |
| 2 mSv | 200 mrem |
| 2.4 mSv | 240 mrem |
| 3 mSv | 300 mrem |
| 4 mSv | 400 mrem |
| 6.2 mSv | 620 mrem |
| 10 mSv | 1000 mrem |
| 20 mSv | 2000 mrem |
| 50 mSv | 5000 mrem |
| 100 mSv | 10000 mrem |
| 250 mSv | 25000 mrem |
| 500 mSv | 50000 mrem |
| 1000 mSv | 100000 mrem |
Common mSv to mrem Examples
- 0.05 mSv = 5 mrem
- 0.1 mSv = 10 mrem
- 1 mSv = 100 mrem
- 2.4 mSv = 240 mrem
- 10 mSv = 1000 mrem
- 20 mSv = 2000 mrem
- 100 mSv = 10000 mrem
- 1000 mSv = 100000 mrem
About mSv to mrem
The sievert and the rem measure the same thing — biological dose — with 1 Sv = 100 rem, so the milli-versions follow: multiply mSv by 100 to get mrem. Everyday anchors: a chest X-ray ≈ 0.1 mSv = 10 mrem; annual natural background ≈ 3 mSv = 300 mrem; a chest CT ≈ 7 mSv = 700 mrem; the common occupational annual limit is 20 mSv = 2,000 mrem (the US NRC limit is 5,000 mrem).
Unit conversion only — dose limits and medical decisions belong to health physicists and doctors.
About the units
Millisieverts (mSv) — The millisievert is the practical scale of radiation protection: annual natural background is 2–3 mSv, a chest CT about 6–7 mSv, and the common occupational limit 20 mSv per year.
Millirems (mrem) — The millirem is the everyday-scale US dose unit: a chest X-ray is about 10 mrem, a year of natural background roughly 300 mrem.
Frequently Asked Questions
How many mrem is 1 mSv?
Exactly 100 mrem. The rem is defined as 1/100 of a sievert.
Is a 10 mSv scan dangerous?
That is 1,000 mrem — within the range of medical CT imaging. Risk assessment depends on context and belongs to your doctor; this page only converts the units.
Where does the unit mrem come from?
The millirem is the everyday-scale US dose unit: a chest X-ray is about 10 mrem, a year of natural background roughly 300 mrem.
Where does the unit mSv come from?
The millisievert is the practical scale of radiation protection: annual natural background is 2–3 mSv, a chest CT about 6–7 mSv, and the common occupational limit 20 mSv per year.
Is the conversion from mSv to mrem exact?
The ratio 100 is defined to high precision and is exact for most practical purposes. Rounding only matters when many decimal places are needed.
How do I convert mSv to mrem by hand?
Take the value in mSv and multiply the value by 100. The result is the same value expressed in mrem.
What is the formula to convert mSv to mrem?
The formula is 1 mSv = 100 mrem. To convert any value, multiply the value by 100.
How much is 1 mSv in mrem?
1 mSv equals 100 mrem. This ratio applies to every conversion between the two units.