Radiation Converter
Radiation Converter — runs in your browser. Inputs are not stored.
Radiation unit conversion
Enter values, then press Calculate.
Simple conversion factors: 1 Sv = 100 rem, 1 Gy = 100 rad. Not for medical or radiation-protection decisions.
How to use
- Under kind, choose equivalent dose (Sv ↔ rem) or absorbed dose (Gy ↔ rad). The default is equivalent dose.
- Enter a value and unit. Equivalent dose units are Sv, mSv, µSv, rem, and mrem.
- Switching to absorbed dose shows Gy, mGy, rad, and mrad.
- Convert or an input change updates the other units of the same kind.
- Reset restores equivalent dose and value 1. This is not for medical or protection decisions.
Key concepts
The sievert (Sv) is equivalent/effective dose; the gray (Gy) is absorbed dose. Legacy rem and rad convert simply as 1 Sv = 100 rem and 1 Gy = 100 rad. This tool only multiplies those factors and SI prefixes (m, µ). Radiation weighting, tissue weighting, and quality factor are not included. Changing kind changes the unit list while keeping the value. Moving an equivalent-dose number into absorbed dose changes the physical meaning—check kind. Conversion redraws on each input.
Do not interpret diagnostic X-rays, plant work, or aircrew exposure from this number alone. Statutory limits and personal dosimeter readings follow the regulator and health-physics procedure. It is a reference conversion for study, unit matching, and paper tables. Use it to line up rem/rad in older literature with Sv/Gy in SI papers. Do not convert Sv to Gy without weights; this page does not provide that conversion.
Example
1 Sv is 1000 mSv, 1,000,000 µSv, 100 rem. 1 mSv is 100 mrem. Absorbed dose 1 Gy is 100 rad, 1000 mGy. When annual natural background is written as a few mSv, read it next to the rem row. Do not use it for clinical decisions. 2.4 mSv is 2400 µSv, 0.24 rem. 50 mGy is 5 rad. Do not interpret airport screening from this number alone.
Related: Engineering unit converter · Web calculator
Frequently asked questions
What is the Sv–rem factor in the radiation unit converter?
1 Sv = 100 rem, 1 rem = 0.01 Sv. mSv, µSv, and mrem are aligned by powers of 10. If a statutory dose-limit document uses mSv, treat the rem row as reference only. Do not change the reporting unit.
How do gray (Gy) and rad convert?
1 Gy = 100 rad. Switch kind to absorbed dose, then enter Gy or rad. It is not mixed with the equivalent-dose list. Absorbed-dose mode has no Sv; switch kind back to equivalent dose to see sieverts.
What is the difference between equivalent dose and absorbed dose?
Absorbed dose is energy received by matter (Gy); equivalent dose reflects biological weighting (Sv). This screen converts the two families separately and does not convert between them. Effective dose and equivalent dose are split further in the field. This tool handles unit factors only.
May I use the radiation converter for medical exposure decisions?
No. It is for study and unit reference. Follow a professional and official dose assessment for care and protection. Diagnostic reference levels and personal dosimeter readings follow hospital or workplace procedure first.
Do mSv and µSv appear too?
They appear under equivalent dose. They are milli- and microsieverts often used for environment and aviation. This is not a calculator that adds natural background and medical exposure. It only converts.
Are tissue weighting factors applied?
No. Only simple unit factors are multiplied. There is also no physical conversion between Sv and Gy. If you need ICRP-weighted results, use health-physics software.
Last reviewed: 2026-09-04