Rem to Sievert Converter

About this calculator

Rem (roentgen equivalent man) and sievert (Sv) both measure radiation equivalent dose — absorbed dose weighted by the biological damage a given radiation type causes — but rem is the older CGS unit still common in U.S. regulatory and medical contexts, while sievert is the SI unit used almost everywhere else. The conversion is fixed and simple: 1 Sv = 100 rem, so 1 rem = 10 millisievert = 10,000 microsievert.

This converter takes a dose in rem and returns the equivalent in sievert, millisievert, and microsievert. Radiation safety officers and medical physicists use it to translate U.S. dosimetry badge readings (often reported in mrem) into SI units required by international standards or research papers, and nuclear medicine and radiology staff use it when comparing exposure limits across guidelines that mix the two unit systems.