Radiation Dose Converter
Convert sieverts, millisieverts, microsieverts, rem and millirem for radiation dose equivalents.
How to use
- 1Enter a dose and its unit.
- 2Choose the unit to convert to.
How it's calculated
1 sievert = 100 rem. Units scale by powers of 1,000 (Sv, mSv, µSv).
Frequently asked questions
How many rem is one sievert?
100 rem. So 1 mSv = 100 mrem.
Can I convert gray to sievert here?
Not directly. Gray measures absorbed energy; sievert adjusts for the type of radiation and tissue. For X-rays and gamma rays they are numerically equal.
How much radiation is a chest X-ray?
Roughly 0.1 mSv, about the same as a few days of natural background radiation. Doses vary by machine and person.