☢️ Radiation Converter
Translate between SI and legacy radiation dose units.
Useful for health physics, radiology, and nuclear compliance comparisons.
One thousandth of a sievert.
Roentgen equivalent man.
5 Millisievert (mSv) equals
0.5 rem
Other Units
Sievert (Sv)
0.005
SI unit for effective dose.
Millisievert (mSv)
5
One thousandth of a sievert.
Microsievert (µSv)
5,000
One millionth of a sievert.
millirem (mrem)
500
One thousandth of a rem.
Gray (Gy)
0.005
SI absorbed dose; equals sievert for QF=1.
rad
0.5
Non-SI absorbed dose; 100 rad = 1 Gy.
How to Use This Calculator
Enter the dose
Use readings from dosimeters, reports, or calculations.
Select units
Pick the starting unit (sievert, rem, gray, rad, etc.) and the unit you need.
Review equivalents
Copy the converted values for medical records, regulatory forms, or safety briefings.
Formula
Sieverts = Dose × Conversion Factor
Rem = Sieverts × 100
rad = Gray × 100
Assumes quality factor (QF) = 1 when converting Gray ↔ Sievert. Adjust manually for different radiation types.
Use the formula breakdown to confirm the calculation logic or perform the conversion manually if needed.
Full Description
Radiation doses appear in multiple unit systems. Modern safety standards use sieverts and grays, while legacy documents may list rem or rad. This converter bridges the gap so teams can communicate clearly.
By default, it assumes a radiation weighting factor of 1 (photons, electrons). For neutrons or alpha particles, apply the appropriate factor to convert between absorbed and effective doses.
Use it for compliance reporting, medical imaging reviews, or comparing public exposure limits with occupational ones.
Frequently Asked Questions
Is Gray always equal to Sievert?
Only when the radiation weighting factor is 1. For other radiation types, multiply Gray by the appropriate factor to get Sievert.
Why include millirem and microsievert?
Low-level exposures (e.g., background radiation) are often reported in those subunits. The converter handles both ends of the scale.
Does it convert dose rate (e.g., mSv/h)?
It focuses on total dose. For dose rate, convert the numeric portion and keep the /h suffix consistent.
Can I add more legacy units?
Yes. Extend the RADIATION_DOSE_UNITS table with the conversion factors you need.