Radiation Dose Converter
Convert Sv, mSv, µSv, rem and mrem for equivalent dose. Absorbed dose in gray is a different quantity and isn't converted to sieverts.
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How to use this tool
Steps for using the Unit Converter.
- Type a number into From — millisieverts are preselected. Commas and scientific notation such as 2.5e3 are accepted.
- Pick the units to convert between; the result in millirem (or whichever unit you choose) updates as you type. Use the swap button to reverse the conversion.
- Set the decimal places, turn on Show formula to see the calculation, and copy or share the result.
- Below the converter, the table lists every equivalent dose unit with its exact definition, and the links open dedicated pages for the most common pairs.
Example
2.4 millisieverts to millirem
2.4 mSv240 mrem
Formula: mrem = mSv × 100Common use cases
- Comparing medical-imaging doses.
- Reading dosimeter values in µSv/mSv or mrem.
- Converting US (rem) and SI (Sv) radiation-protection figures.
Radiation Dose unit table
| Unit | Symbol | System | Definition | In sieverts |
|---|---|---|---|---|
| Microsievert | µSv | Metric | 10⁻⁶ Sv | 0.000001 |
| Millisievert | mSv | Metric | 1/1000 Sv | 0.001 |
| Sievert | Sv | SI | SI unit of equivalent dose (1 J/kg, weighted) | 1 |
| Millirem | mrem | Other | 1/1000 rem = 0.01 mSv | 0.00001 |
| Rem | rem | Other | Exactly 0.01 Sv | 0.01 |
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About equivalent dose units
This converter handles equivalent and effective dose, in sieverts (Sv) and the older rem (1 rem = 0.01 Sv). These dose units account for the type of radiation and the tissue exposed, and are used for radiation protection and medical imaging.
Absorbed dose — in gray (Gy) or rad — is a different quantity: energy deposited per kilogram. Turning grays into sieverts needs radiation and tissue weighting factors, so this page doesn't convert between them. For reference, the average natural background dose is around 2.4 mSv per year.
Limitations
- Absorbed dose (Gy, rad) isn't converted to Sv: the conversion depends on weighting factors.
- Results are rounded for display only; the calculation keeps full precision (15 significant digits).
Frequently asked questions
How many mrem is 1 mSv?
100 mrem.
Can I convert gray to sievert?
Not with a fixed factor. For X-rays and gamma rays 1 Gy gives about 1 Sv, but other radiation types and tissues use different weighting factors.
What is a typical background dose?
Worldwide, the average natural background is about 2.4 mSv (240 mrem) per year.
Are these equivalent dose conversions exact?
Each unit is defined from its official definition (for example 1 inch = 2.54 cm exactly). Results are calculated in double precision and only rounded to the decimal places you choose when shown.