Convert Picocuries to Curies (pCi to Ci)
1 picocurie (pCi) = 1 × 10⁻¹² curies (Ci). 1 Ci = 1000000000000 pCi. Example: 15 pCi = 15 × 1 × 10⁻¹² = 1.5 × 10⁻¹¹ Ci.
Also searched as picocuries to Ci, picocuries in Ci, picocuries into curies, pCi to Ci, pCi in curies, pCi into curie, picocurie to curie, pCi to curies converter and how many curies in a picocurie.
1 pCi = 1e-12 Ci
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk picocurie to curie converter to paste a column from Excel.
How to Convert Picocurie to Curie
- 1 pCi = 1 × 10⁻¹² Ci
- 1 Ci = 1000000000000 pCi
- Example: convert 15 pCi to Ci: 15 pCi = 15 × 1 × 10⁻¹² Ci = 1.5 × 10⁻¹¹ Ci
Formula
Ci = pCi ÷ 1000000000000
Derivation from SI units:
- 1 pCi = 0.037 Bq.
- 1 Ci = 3.7 × 10¹⁰ Bq exactly (originally the activity of 1 g of radium-226).
- 1 pCi = 0.037 Bq ÷ 37000000000 Bq per Ci = 1 × 10⁻¹² Ci
Both units are defined exactly, so the factor is exact. Picocurie definition: picocurie; Curie definition: curie.
Worked examples
- A reading of 4 pCi converts to 4 × 10⁻¹² Ci.
4 pCi × 1 × 10⁻¹² = 4 × 10⁻¹² Ci - A value of 20 pCi is 2 × 10⁻¹¹ Ci.
20 pCi × 1 × 10⁻¹² = 2 × 10⁻¹¹ Ci
Picocurie to Curie conversion table
| Picocuries (pCi) | Curies (Ci) |
|---|---|
| 0.4 pCi | 4 × 10⁻¹³ Ci |
| 1 pCi | 1 × 10⁻¹² Ci |
| 2 pCi | 2 × 10⁻¹² Ci |
| 4 pCi | 4 × 10⁻¹² Ci |
| 8 pCi | 8 × 10⁻¹² Ci |
| 10 pCi | 1 × 10⁻¹¹ Ci |
| 20 pCi | 2 × 10⁻¹¹ Ci |
| 50 pCi | 5 × 10⁻¹¹ Ci |
| 100 pCi | 1 × 10⁻¹⁰ Ci |
| 1000 pCi | 1 × 10⁻⁹ Ci |
Where it's used
Picocuries are used for radon in homes (pCi/L), while curies appear in US nuclear regulation and licences. Both measure activity of a radioactive source, so the conversion is a fixed factor.
Picocurie to other radioactivity units
| Conversion | 1 pCi equals |
|---|---|
| picocurie to curie | 1 × 10⁻¹² Ci |
| picocurie to becquerel | 0.037 Bq |
| picocurie to megabecquerel | 3.7 × 10⁻⁸ MBq |
| picocurie to millicurie | 1 × 10⁻⁹ mCi |
| picocurie to kilobecquerel | 0.000037 kBq |
| picocurie to gigabecquerel | 3.7 × 10⁻¹¹ GBq |
| picocurie to microcurie | 0.000001 µCi |
| picocurie to disintegration per minute | 2.22 dpm |
Show 3 more units
| picocurie to terabecquerel | 3.7 × 10⁻¹⁴ TBq |
|---|---|
| picocurie to nanocurie | 0.001 nCi |
| picocurie to rutherford | 3.7 × 10⁻⁸ Rd |
Frequently asked questions
How many curies are in 1 picocurie?
1 pCi = 1 × 10⁻¹² Ci.
How do I convert picocuries to curies?
Multiply the value in pCi by 1 × 10⁻¹², or divide it by 1000000000000. For example, 15 pCi × 1 × 10⁻¹² = 1.5 × 10⁻¹¹ Ci.
Is the pCi to Ci conversion exact?
Yes. Both units are defined exactly, and 1 pCi is exactly 1 × 10⁻¹² Ci.
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 Picocuries to Curies (pCi to Ci). Retrieved October 25, 2026, from https://scientificconverters.com/radioactivity/picocuries-to-curies/
IEEE
Scientific Converters, "Convert Picocuries to Curies (pCi to Ci)," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/radioactivity/picocuries-to-curies/