Quick reference table
Common radioactivity conversions
| From | To |
|---|---|
| 1 Ci | 37 Bq |
| 1 mCi | 37 MBq |
| 1 µCi | 37 kBq |
| 1 Bq | 60.00000000 dpm |
| 1 GBq | 0.02702702703 Ci |
How to convert radioactivity
Radioactivity (activity) counts decays per second. The SI unit is the becquerel (Bq), and the older curie (Ci) is still common in medicine and industry.
Every radioactivity unit is a fixed multiple of one base unit, the Bq. To convert a value, multiply it by the size of the starting unit and divide by the size of the target unit. For example, to convert Ci to Bq, multiply by 37. To go the other way, divide by 37.
The converter above does this for you and shows the exact formula under the result.
Worked examples
Curies to Becquerels
| Curies (Ci) | Becquerels (Bq) |
|---|---|
| 1 Ci | 37 Bq |
| 2 Ci | 74 Bq |
| 5 Ci | 185 Bq |
| 10 Ci | 37 Bq |
| 25 Ci | 925 Bq |
| 50 Ci | 185 Bq |
| 100 Ci | 37 Bq |
| 1,000 Ci | 37 Bq |
Millicuries to Megabecquerels
| Millicuries (mCi) | Megabecquerels (MBq) |
|---|---|
| 1 mCi | 37 MBq |
| 2 mCi | 74 MBq |
| 5 mCi | 185 MBq |
| 10 mCi | 370 MBq |
| 25 mCi | 925 MBq |
| 50 mCi | 1,850 MBq |
| 100 mCi | 3,700 MBq |
| 1,000 mCi | 37,000 MBq |
Radioactivity units explained
| Unit | Symbol | Equals |
|---|---|---|
| Becquerels | Bq | 1 Bq = 1 Bq |
| Kilobecquerels | kBq | 1 kBq = 1,000 Bq |
| Megabecquerels | MBq | 1 MBq = 1,000,000 Bq |
| Gigabecquerels | GBq | 1 GBq = 1,000,000,000 Bq |
| Terabecquerels | TBq | 1 TBq = 1 Bq |
| Curies | Ci | 1 Ci = 37,000,000,000 Bq |
| Millicuries | mCi | 1 mCi = 37,000,000 Bq |
| Microcuries | µCi | 1 µCi = 37,000 Bq |
| Nanocuries | nCi | 1 nCi = 37 Bq |
| Rutherfords | Rd | 1 Rd = 1,000,000 Bq |
| Disintegrations per minute | dpm | 1 dpm = 0.0166666666667 Bq |
| Disintegrations per second | dps | 1 dps = 1 Bq |
Popular conversions: curie to becquerel, mci to mbq.
Frequently asked questions
How many becquerels is 1 curie?
One curie is exactly 37 billion becquerels (3.7 × 10¹⁰ Bq).
How do I convert Ci to Bq?
Multiply the value in Ci by 37 to get Bq. For example, 10 Ci = 37 Bq.
How many Bq is 1 Ci?
1 Ci = 37 Bq, and 1 Bq = 2.702703 × 10⁻¹¹ Ci.
Does this radioactivity converter work offline?
Yes. After the page has loaded once, all calculations run in your browser, so it keeps working without an internet connection.