maratoolHow to convert sieverts to rem (equivalent dose)
Type an equivalent dose — read Sv, mSv, µSv, rem, or mrem instantly.
Dosimeter badges in the US read mrem; international guidance reads mSv. The Sievert to Rem Converter applies the exact factor of 100 between the systems.
How it works
- Pick units — "Millisievert (mSv)" to "Millirem (mrem)", or any other pair.
- Type a value — the result updates as you type, with swap and copy.
- Copy — one click, with "Copied!" feedback.
Equivalent dose conversion factors
Every unit converts through the sievert (the base unit). To convert A → B, multiply by A's factor and divide by B's:
| Unit | = this many sieverts |
|---|---|
| Sievert (Sv) | 1 |
| Millisievert (mSv) | 0.001 |
| Microsievert (µSv) | 1.0000 × 10^-6 |
| Rem (rem) | 0.01 |
| Millirem (mrem) | 1.0000 × 10^-5 |
| Microrem (µrem) | 1.0000 × 10^-8 |
When you need it
Reference points: a dental X-ray ≈ 5 µSv (0.5 mrem), a transatlantic flight ≈ 40 µSv, annual natural background 2–3 mSv (200–300 mrem), US occupational limit 50 mSv/year (5 rem). Unit conversion only — dose assessment belongs to health physics.
Sources & methodology
Conversion factors follow US NRC — Measuring Radiation; exact-by-definition factors are marked in the tool itself. All math runs client-side in your browser — nothing is uploaded. Unit conversion only — this does not assess dose, risk, or safety, and is not medical advice.
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