Curies to becquerels
Type a value in curies to see it in becquerels straight away, or type in the second box to convert back.
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Processing and privacy: The result is calculated inside your browser and your data is not sent to any server.
How to use it
- Type the value in the curies box.
- Read the result in becquerels as you type, and pick the precision you need.
- Swap the direction to convert back, or copy the result.
How it is calculated
Bq = Ci × 37,000,000,000
Multiply the value in curies by 37,000,000,000 to get becquerels.
Example
To convert 25 Ci to becquerels: 25 × 37,000,000,000 = 925,000,000,000 Bq.
Conversion table
| Curies (Ci) | Becquerels (Bq) |
|---|---|
| 1 | 37,000,000,000 |
| 2 | 74,000,000,000 |
| 3 | 111,000,000,000 |
| 5 | 185,000,000,000 |
| 10 | 370,000,000,000 |
| 20 | 740,000,000,000 |
| 25 | 925,000,000,000 |
| 50 | 1,850,000,000,000 |
| 100 | 3,700,000,000,000 |
| 250 | 9,250,000,000,000 |
| 500 | 18,500,000,000,000 |
| 1,000 | 37,000,000,000,000 |
About the units
- Curie
- An older unit of radioactivity equal to exactly 3.7 × 10^10 becquerels, originally close to the activity of one gram of radium-226.
- Becquerel
- The SI unit of radioactivity, equal to one nuclear decay per second.
Limits and caveats
- Results are rounded for display and computed with the browser's floating point precision (about 15 significant digits).
- Both unit factors are exact by their official definitions.
Questions about this tool
How many becquerels are in one curie?
1 Ci = 37,000,000,000 Bq exactly.
How do I convert curies to becquerels?
Use Bq = Ci × 37,000,000,000. For example, 25 Ci = 925,000,000,000 Bq.
How many curies are in one becquerel?
1 Bq = 2.7027e-11 Ci.
Why is a curie 3.7 × 10^10 becquerels?
The curie was first based on the activity of one gram of radium-226, then fixed at exactly 3.7 × 10^10 decays per second.
Is a becquerel the same as a hertz?
Both equal one per second, but the SI reserves the becquerel for radioactive decay and the hertz for periodic phenomena.