Convert Curies to Picocuries (Ci to pCi)
1 curie (Ci) = 1000000000000 picocuries (pCi). 1 pCi = 1 × 10⁻¹² Ci. Example: 15 Ci = 15 × 1000000000000 = 15000000000000 pCi.
Also searched as curies to pCi, curies in pCi, curies into picocuries, Ci to pCi, Ci in picocuries, Ci into picocurie, curie to picocurie, Ci to picocuries converter and how many picocuries in a curie.
1 Ci = 1000000000000 pCi
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk curie to picocurie converter to paste a column from Excel.
How to Convert Curie to Picocurie
- 1 Ci = 1000000000000 pCi
- 1 pCi = 1 × 10⁻¹² Ci
- Example: convert 15 Ci to pCi: 15 Ci = 15 × 1000000000000 pCi = 15000000000000 pCi
Formula
pCi = Ci × 1000000000000
Derivation from SI units:
- 1 Ci = 3.7 × 10¹⁰ Bq exactly (originally the activity of 1 g of radium-226).
- 1 pCi = 0.037 Bq.
- 1 Ci = 37000000000 Bq ÷ 0.037 Bq per pCi = 1000000000000 pCi
Both units are defined exactly, so the factor is exact. Curie definition: curie; Picocurie definition: picocurie.
Worked examples
- A reading of 2 Ci converts to 2000000000000 pCi.
2 Ci × 1000000000000 = 2000000000000 pCi - A value of 20 Ci is 20000000000000 pCi.
20 Ci × 1000000000000 = 20000000000000 pCi
Curie to Picocurie conversion table
| Curies (Ci) | Picocuries (pCi) |
|---|---|
| 0.1 Ci | 100000000000 pCi |
| 0.5 Ci | 500000000000 pCi |
| 1 Ci | 1000000000000 pCi |
| 2 Ci | 2000000000000 pCi |
| 5 Ci | 5000000000000 pCi |
| 10 Ci | 10000000000000 pCi |
| 20 Ci | 20000000000000 pCi |
| 50 Ci | 50000000000000 pCi |
| 100 Ci | 100000000000000 pCi |
| 1000 Ci | 1 × 10¹⁵ pCi |
Where it's used
Curies are used for US nuclear regulation and licences, while picocuries appear in radon in homes (pCi/L). Both measure activity of a radioactive source, so the conversion is a fixed factor.
Curie to other radioactivity units
| Conversion | 1 Ci equals |
|---|---|
| curie to picocurie | 1000000000000 pCi |
| curie to becquerel | 37000000000 Bq |
| curie to megabecquerel | 37000 MBq |
| curie to millicurie | 1000 mCi |
| curie to kilobecquerel | 37000000 kBq |
| curie to gigabecquerel | 37 GBq |
| curie to microcurie | 1000000 µCi |
| curie to disintegration per minute | 2220000000000 dpm |
Show 3 more units
| curie to terabecquerel | 0.037 TBq |
|---|---|
| curie to nanocurie | 1000000000 nCi |
| curie to rutherford | 37000 Rd |
Frequently asked questions
How many picocuries are in 1 curie?
1 Ci = 1000000000000 pCi.
How do I convert curies to picocuries?
Multiply the value in Ci by 1000000000000. For example, 15 Ci × 1000000000000 = 15000000000000 pCi.
Is the Ci to pCi conversion exact?
Yes. Both units are defined exactly, and 1 Ci is exactly 1000000000000 pCi.
Sources
- 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 Curies to Picocuries (Ci to pCi). Retrieved October 25, 2026, from https://scientificconverters.com/radioactivity/curies-to-picocuries/
IEEE
Scientific Converters, "Convert Curies to Picocuries (Ci to pCi)," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/radioactivity/curies-to-picocuries/