Convert Curies to Microcuries (Ci to µCi)
1 curie (Ci) = 1000000 microcuries (µCi). 1 µCi = 0.000001 Ci. Example: 15 Ci = 15 × 1000000 = 15000000 µCi.
Also searched as curies to µCi, curies in µCi, curies into microcuries, Ci to µCi, Ci in microcuries, Ci into microcurie, curie to microcurie, Ci to microcuries converter and how many microcuries in a curie.
1 Ci = 1000000 µCi
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk curie to microcurie converter to paste a column from Excel.
How to Convert Curie to Microcurie
- 1 Ci = 1000000 µCi
- 1 µCi = 0.000001 Ci
- Example: convert 15 Ci to µCi: 15 Ci = 15 × 1000000 µCi = 15000000 µCi
Formula
µCi = Ci × 1000000
Derivation from SI units:
- 1 Ci = 3.7 × 10¹⁰ Bq exactly (originally the activity of 1 g of radium-226).
- 1 µCi = 3.7 × 10⁴ Bq = 37 kBq.
- 1 Ci = 37000000000 Bq ÷ 37000 Bq per µCi = 1000000 µCi
Both units are defined exactly, so the factor is exact. Curie definition: curie; Microcurie definition: microcurie.
Worked examples
- A reading of 2 Ci converts to 2000000 µCi.
2 Ci × 1000000 = 2000000 µCi - A value of 20 Ci is 20000000 µCi.
20 Ci × 1000000 = 20000000 µCi
Curie to Microcurie conversion table
| Curies (Ci) | Microcuries (µCi) |
|---|---|
| 0.1 Ci | 100000 µCi |
| 0.5 Ci | 500000 µCi |
| 1 Ci | 1000000 µCi |
| 2 Ci | 2000000 µCi |
| 5 Ci | 5000000 µCi |
| 10 Ci | 10000000 µCi |
| 20 Ci | 20000000 µCi |
| 50 Ci | 50000000 µCi |
| 100 Ci | 100000000 µCi |
| 1000 Ci | 1000000000 µCi |
Where it's used
Curies are used for US nuclear regulation and licences, while microcuries appear in check and calibration sources. 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 microcurie | 1000000 µCi |
| curie to becquerel | 37000000000 Bq |
| curie to megabecquerel | 37000 MBq |
| curie to millicurie | 1000 mCi |
| curie to picocurie | 1000000000000 pCi |
| curie to kilobecquerel | 37000000 kBq |
| curie to gigabecquerel | 37 GBq |
| 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 microcuries are in 1 curie?
1 Ci = 1000000 µCi.
How do I convert curies to microcuries?
Multiply the value in Ci by 1000000. For example, 15 Ci × 1000000 = 15000000 µCi.
Is the Ci to µCi conversion exact?
Yes. Both units are defined exactly, and 1 Ci is exactly 1000000 µCi.
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 Microcuries (Ci to µCi). Retrieved October 25, 2026, from https://scientificconverters.com/radioactivity/curies-to-microcuries/
IEEE
Scientific Converters, "Convert Curies to Microcuries (Ci to µCi)," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/radioactivity/curies-to-microcuries/