Convert Becquerels to Curies (Bq to Ci)
1 becquerel (Bq) = 2.702702703 × 10⁻¹¹ curies (Ci). 1 Ci = 37000000000 Bq. Example: 37000000000 Bq = 37000000000 × 2.702702703 × 10⁻¹¹ = 1 Ci.
Also searched as Bq to Ci, becquerels to curies and becquerel to curie.
1 Bq = 2.702702703e-11 Ci
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk becquerel to curie converter to paste a column from Excel.
How to Convert Becquerel to Curie
- 1 Bq = 2.702702703 × 10⁻¹¹ Ci
- 1 Ci = 37000000000 Bq
- Example: convert 37000000000 Bq to Ci: 37000000000 Bq = 37000000000 × 2.702702703 × 10⁻¹¹ Ci = 1 Ci
Formula
Ci = Bq ÷ 37000000000
Derivation from SI units:
- 1 Bq = 1 decay per second (s⁻¹).
- 1 Ci = 3.7 × 10¹⁰ Bq exactly (originally the activity of 1 g of radium-226).
Both units are defined exactly, so the factor is exact. Becquerel definition: becquerel; Curie definition: curie.
Worked examples
- 37000000000 Bq is 1 Ci.
37000000000 Bq × 2.702702703 × 10⁻¹¹ = 1 Ci - A 1000000 Bq sample is 0.00002702702703 Ci.
1000000 Bq × 2.702702703 × 10⁻¹¹ = 0.00002702702703 Ci
Becquerel to Curie conversion table
| Becquerels (Bq) | Curies (Ci) |
|---|---|
| 1 Bq | 2.702702703 × 10⁻¹¹ Ci |
| 10 Bq | 2.702702703 × 10⁻¹⁰ Ci |
| 37 Bq | 1 × 10⁻⁹ Ci |
| 100 Bq | 2.702702703 × 10⁻⁹ Ci |
| 370 Bq | 1 × 10⁻⁸ Ci |
| 1000 Bq | 2.702702703 × 10⁻⁸ Ci |
| 3700 Bq | 1 × 10⁻⁷ Ci |
| 10000 Bq | 2.702702703 × 10⁻⁷ Ci |
| 37000 Bq | 0.000001 Ci |
| 1000000 Bq | 0.00002702702703 Ci |
Where it's used
Activities in becquerels from SI documents, lab certificates and EU regulations are converted to curies for US forms and older references. Divide by 3.7 × 10¹⁰.
Becquerel to other radioactivity units
| Conversion | 1 Bq equals |
|---|---|
| becquerel to curie | 2.702702703 × 10⁻¹¹ Ci |
| becquerel to megabecquerel | 0.000001 MBq |
| becquerel to millicurie | 2.702702703 × 10⁻⁸ mCi |
| becquerel to picocurie | 27.02702703 pCi |
| becquerel to kilobecquerel | 0.001 kBq |
| becquerel to gigabecquerel | 1 × 10⁻⁹ GBq |
| becquerel to microcurie | 0.00002702702703 µCi |
| becquerel to disintegration per minute | 60 dpm |
Show 3 more units
| becquerel to terabecquerel | 1 × 10⁻¹² TBq |
|---|---|
| becquerel to nanocurie | 0.02702702703 nCi |
| becquerel to rutherford | 0.000001 Rd |
Frequently asked questions
How do I convert Bq to Ci?
Divide by 3.7 × 10¹⁰: 1 MBq = 0.00002702702703 Ci, about 27 µCi.
How many curies are in 1 becquerel?
1 Bq = 2.702702703 × 10⁻¹¹ Ci.
How do I convert becquerels to curies?
Multiply the value in Bq by 2.702702703 × 10⁻¹¹, or divide it by 37000000000. For example, 37000000000 Bq × 2.702702703 × 10⁻¹¹ = 1 Ci.
Is the Bq to Ci conversion exact?
Yes. Both units are defined exactly, so the ratio is exact; its decimal form does not terminate and is shown here to 10 significant figures (more with the precision selector).
Sources
- The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 4 (becquerel, gray, sievert, lux) and Table 2 (candela).
- Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "curie".
Last reviewed: . Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.
Cite this page
APA
Scientific Converters. (2026, October 15). Convert Becquerels to Curies (Bq to Ci). Retrieved October 25, 2026, from https://scientificconverters.com/radioactivity/becquerels-to-curies/
IEEE
Scientific Converters, "Convert Becquerels to Curies (Bq to Ci)," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/radioactivity/becquerels-to-curies/