maratoolHow to convert becquerels to curies (radioactivity)
Type an activity — read Bq, MBq, GBq, Ci, mCi, or dpm instantly.
Lab certificates list kBq, US licenses list mCi, and survey meters count dpm. The Becquerel to Curie Converter moves between all activity units with exact factors.
How it works
- Pick units — "Millicurie (mCi)" to "Megabecquerel (MBq)", or any other pair.
- Type a value — the result updates as you type, with swap and copy.
- Copy — one click, with "Copied!" feedback.
Radioactivity conversion factors
Every unit converts through the becquerel (the base unit). To convert A → B, multiply by A's factor and divide by B's:
| Unit | = this many becquerels |
|---|---|
| Terabecquerel (TBq) | 1.0000 × 10^12 |
| Gigabecquerel (GBq) | 1.0000 × 10^9 |
| Megabecquerel (MBq) | 1,000,000 |
| Kilobecquerel (kBq) | 1,000 |
| Becquerel (Bq) | 1 |
| Curie (Ci) | 3.7000 × 10^10 |
| Millicurie (mCi) | 3.7000 × 10^7 |
| Microcurie (µCi) | 37,000 |
| Nanocurie (nCi) | 37 |
| Picocurie (pCi) | 0.037 |
| Disintegrations per minute (dpm) | 0.016666666667 |
| Disintegrations per second (dps) | 1 |
When you need it
Activity measures decays per second, not danger — a gram of natural potassium (31 Bq) and a medical Tc-99m dose (370 MBq) differ by 7 orders of magnitude, and neither number alone describes dose. For dose units, see the Sievert to Rem Converter.
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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