Convert Microcuries to Curies (µCi to Ci)
1 microcurie (µCi) = 0.000001 curies (Ci). 1 Ci = 1000000 µCi. Example: 15 µCi = 15 × 0.000001 = 0.000015 Ci.
Also searched as microcuries to Ci, microcuries in Ci, microcuries into curies, µCi to Ci, µCi in curies, µCi into curie, microcurie to curie, µCi to curies converter and how many curies in a microcurie.
1 µCi = 0.000001 Ci
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk microcurie to curie converter to paste a column from Excel.
How to Convert Microcurie to Curie
- 1 µCi = 0.000001 Ci
- 1 Ci = 1000000 µCi
- Example: convert 15 µCi to Ci: 15 µCi = 15 × 0.000001 Ci = 0.000015 Ci
Formula
Ci = µCi ÷ 1000000
Derivation from SI units:
- 1 µCi = 3.7 × 10⁴ Bq = 37 kBq.
- 1 Ci = 3.7 × 10¹⁰ Bq exactly (originally the activity of 1 g of radium-226).
- 1 µCi = 37000 Bq ÷ 37000000000 Bq per Ci = 0.000001 Ci
Both units are defined exactly, so the factor is exact. Microcurie definition: microcurie; Curie definition: curie.
Worked examples
- A reading of 2 µCi converts to 0.000002 Ci.
2 µCi × 0.000001 = 0.000002 Ci - A value of 20 µCi is 0.00002 Ci.
20 µCi × 0.000001 = 0.00002 Ci
Microcurie to Curie conversion table
| Microcuries (µCi) | Curies (Ci) |
|---|---|
| 0.1 µCi | 1 × 10⁻⁷ Ci |
| 0.5 µCi | 5 × 10⁻⁷ Ci |
| 1 µCi | 0.000001 Ci |
| 2 µCi | 0.000002 Ci |
| 5 µCi | 0.000005 Ci |
| 10 µCi | 0.00001 Ci |
| 20 µCi | 0.00002 Ci |
| 50 µCi | 0.00005 Ci |
| 100 µCi | 0.0001 Ci |
| 1000 µCi | 0.001 Ci |
Where it's used
Microcuries are used for check and calibration sources, while curies appear in US nuclear regulation and licences. Both measure activity of a radioactive source, so the conversion is a fixed factor.
Microcurie to other radioactivity units
| Conversion | 1 µCi equals |
|---|---|
| microcurie to curie | 0.000001 Ci |
| microcurie to becquerel | 37000 Bq |
| microcurie to megabecquerel | 0.037 MBq |
| microcurie to millicurie | 0.001 mCi |
| microcurie to picocurie | 1000000 pCi |
| microcurie to kilobecquerel | 37 kBq |
| microcurie to gigabecquerel | 0.000037 GBq |
| microcurie to disintegration per minute | 2220000 dpm |
Show 3 more units
| microcurie to terabecquerel | 3.7 × 10⁻⁸ TBq |
|---|---|
| microcurie to nanocurie | 1000 nCi |
| microcurie to rutherford | 0.037 Rd |
Frequently asked questions
How many curies are in 1 microcurie?
1 µCi = 0.000001 Ci.
How do I convert microcuries to curies?
Multiply the value in µCi by 0.000001, or divide it by 1000000. For example, 15 µCi × 0.000001 = 0.000015 Ci.
Is the µCi to Ci conversion exact?
Yes. Both units are defined exactly, and 1 µCi is exactly 0.000001 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 Microcuries to Curies (µCi to Ci). Retrieved October 25, 2026, from https://scientificconverters.com/radioactivity/microcuries-to-curies/
IEEE
Scientific Converters, "Convert Microcuries to Curies (µCi to Ci)," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/radioactivity/microcuries-to-curies/