Convert Microcuries to Millicuries (µCi to mCi)
1 microcurie (µCi) = 0.001 millicuries (mCi). 1 mCi = 1000 µCi. Example: 15 µCi = 15 × 0.001 = 0.015 mCi.
Also searched as microcuries to mCi, microcuries in mCi, microcuries into millicuries, µCi to mCi, µCi in millicuries, µCi into millicurie, microcurie to millicurie, µCi to millicuries converter and how many millicuries in a microcurie.
1 µCi = 0.001 mCi
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk microcurie to millicurie converter to paste a column from Excel.
How to Convert Microcurie to Millicurie
- 1 µCi = 0.001 mCi
- 1 mCi = 1000 µCi
- Example: convert 15 µCi to mCi: 15 µCi = 15 × 0.001 mCi = 0.015 mCi
Formula
mCi = µCi ÷ 1000
Derivation from SI units:
- 1 µCi = 3.7 × 10⁴ Bq = 37 kBq.
- 1 mCi = 3.7 × 10⁷ Bq = 37 MBq.
- 1 µCi = 37000 Bq ÷ 37000000 Bq per mCi = 0.001 mCi
Both units are defined exactly, so the factor is exact. Microcurie definition: microcurie; Millicurie definition: millicurie.
Worked examples
- A reading of 2 µCi converts to 0.002 mCi.
2 µCi × 0.001 = 0.002 mCi - A value of 20 µCi is 0.02 mCi.
20 µCi × 0.001 = 0.02 mCi
Microcurie to Millicurie conversion table
| Microcuries (µCi) | Millicuries (mCi) |
|---|---|
| 0.1 µCi | 0.0001 mCi |
| 0.5 µCi | 0.0005 mCi |
| 1 µCi | 0.001 mCi |
| 2 µCi | 0.002 mCi |
| 5 µCi | 0.005 mCi |
| 10 µCi | 0.01 mCi |
| 20 µCi | 0.02 mCi |
| 50 µCi | 0.05 mCi |
| 100 µCi | 0.1 mCi |
| 1000 µCi | 1 mCi |
Where it's used
Microcuries are used for check and calibration sources, while millicuries appear in US radiopharmaceutical doses (e.g. 10 mCi FDG). 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 millicurie | 0.001 mCi |
| microcurie to becquerel | 37000 Bq |
| microcurie to curie | 0.000001 Ci |
| microcurie to megabecquerel | 0.037 MBq |
| 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 millicuries are in 1 microcurie?
1 µCi = 0.001 mCi.
How do I convert microcuries to millicuries?
Multiply the value in µCi by 0.001, or divide it by 1000. For example, 15 µCi × 0.001 = 0.015 mCi.
Is the µCi to mCi conversion exact?
Yes. Both units are defined exactly, and 1 µCi is exactly 0.001 mCi.
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 Millicuries (µCi to mCi). Retrieved October 25, 2026, from https://scientificconverters.com/radioactivity/microcuries-to-millicuries/
IEEE
Scientific Converters, "Convert Microcuries to Millicuries (µCi to mCi)," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/radioactivity/microcuries-to-millicuries/