Convert radiation equivalent dose measurements between sieverts, millisieverts, microsieverts, rem and millirem.
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Result
1000 mSv
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This tool converts between radiation equivalent dose units using fixed conversion factors, for example, 1 sievert equals 1,000 millisieverts, and 1 rem equals 10 millisieverts. Enter a value in any supported unit and it's converted to all others using these standard ratios.
The sievert (and its smaller unit, the millisievert) is the SI unit for radiation equivalent dose, used internationally and in most modern scientific and medical contexts. Rem (and millirem) is an older unit still used in some US regulatory and occupational contexts. This converter covers equivalent dose only, used for assessing biological radiation exposure, not the separate concept of radioactivity (measured in becquerels or curies).
Converting the commonly cited annual natural background radiation dose, about 3 millisieverts, to rem gives 0.3 rem (3 ÷ 10), letting you compare a dose reported in the international SI unit against an older US regulatory document that reports limits in rem or millirem.
Confusing equivalent dose (sieverts/rem, this converter) with radioactivity itself (becquerels/curies), the two measure different things, how much biological harm a dose could cause versus how many atoms are decaying, and don't convert into each other.
Treating this reference information as medical guidance for a specific personal exposure, dose significance depends heavily on context (dose rate, exposure duration, body area affected), consult a qualified medical or radiation safety professional for any actual health-related radiation question.
Assuming sievert and rem differ by a small amount, they differ by a factor of 100 (1 Sv = 100 rem), a decimal-point-level mixup here represents a meaningfully different radiation dose.
Divide millisieverts by 10 to get rem, or use this converter for an instant result.
A chest X-ray is commonly cited as delivering around 0.1 millisieverts, a small fraction of the roughly 3 millisieverts most people receive annually from natural background radiation. This is general reference information, not medical advice.
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