Convert Millicuries to Curies (mCi to Ci)
1 millicurie (mCi) = 0.001 curies (Ci). 1 Ci = 1000 mCi. Example: 15 mCi = 15 × 0.001 = 0.015 Ci.
Also searched as millicuries to Ci, millicuries in Ci, millicuries into curies, mCi to Ci, mCi in curies, mCi into curie, millicurie to curie, mCi to curies converter and how many curies in a millicurie.
1 mCi = 0.001 Ci
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk millicurie to curie converter to paste a column from Excel.
How to Convert Millicurie to Curie
- 1 mCi = 0.001 Ci
- 1 Ci = 1000 mCi
- Example: convert 15 mCi to Ci: 15 mCi = 15 × 0.001 Ci = 0.015 Ci
Formula
Ci = mCi ÷ 1000
Derivation from SI units:
- 1 mCi = 3.7 × 10⁷ Bq = 37 MBq.
- 1 Ci = 3.7 × 10¹⁰ Bq exactly (originally the activity of 1 g of radium-226).
- 1 mCi = 37000000 Bq ÷ 37000000000 Bq per Ci = 0.001 Ci
Both units are defined exactly, so the factor is exact. Millicurie definition: millicurie; Curie definition: curie.
Worked examples
- A reading of 15 mCi converts to 0.015 Ci.
15 mCi × 0.001 = 0.015 Ci - A value of 30 mCi is 0.03 Ci.
30 mCi × 0.001 = 0.03 Ci
Millicurie to Curie conversion table
| Millicuries (mCi) | Curies (Ci) |
|---|---|
| 1 mCi | 0.001 Ci |
| 5 mCi | 0.005 Ci |
| 10 mCi | 0.01 Ci |
| 15 mCi | 0.015 Ci |
| 20 mCi | 0.02 Ci |
| 25 mCi | 0.025 Ci |
| 30 mCi | 0.03 Ci |
| 50 mCi | 0.05 Ci |
| 100 mCi | 0.1 Ci |
| 200 mCi | 0.2 Ci |
Where it's used
Millicuries are used for US radiopharmaceutical doses (e.g. 10 mCi FDG), while curies appear in US nuclear regulation and licences. Both measure activity of a radioactive source, so the conversion is a fixed factor.
Millicurie to other radioactivity units
| Conversion | 1 mCi equals |
|---|---|
| millicurie to curie | 0.001 Ci |
| millicurie to becquerel | 37000000 Bq |
| millicurie to megabecquerel | 37 MBq |
| millicurie to picocurie | 1000000000 pCi |
| millicurie to kilobecquerel | 37000 kBq |
| millicurie to gigabecquerel | 0.037 GBq |
| millicurie to microcurie | 1000 µCi |
| millicurie to disintegration per minute | 2220000000 dpm |
Show 3 more units
| millicurie to terabecquerel | 0.000037 TBq |
|---|---|
| millicurie to nanocurie | 1000000 nCi |
| millicurie to rutherford | 37 Rd |
Frequently asked questions
How many curies are in 1 millicurie?
1 mCi = 0.001 Ci.
How do I convert millicuries to curies?
Multiply the value in mCi by 0.001, or divide it by 1000. For example, 15 mCi × 0.001 = 0.015 Ci.
Is the mCi to Ci conversion exact?
Yes. Both units are defined exactly, and 1 mCi is exactly 0.001 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 Millicuries to Curies (mCi to Ci). Retrieved October 25, 2026, from https://scientificconverters.com/radioactivity/millicuries-to-curies/
IEEE
Scientific Converters, "Convert Millicuries to Curies (mCi to Ci)," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/radioactivity/millicuries-to-curies/