Radioactivity
µCitomCi
Convert microcuries (µCi) to millicuries (mCi).
Factor1 µCi = 0.001 mCi
Converter
µCi
Accepts numbers or expressions, e.g. 150 + 14.7
Result
mCi
Rendered to 6 significant figures.
Formula
Formula
mCi = µCi × 0.001
Multiply any value in microcuries by 0.001 to obtain the value in millicuries.
Worked example
Convert 1000 µCi to mCi.
- 01Start with 1000 µCi.
- 02Multiply by the conversion factor: 1000 × 0.001 = 1 mCi.
Result1000 µCi = 1 mCi
Conversion table
| µCi | mCi |
|---|---|
| 1 | 0.001 |
| 2 | 0.002 |
| 5 | 0.005 |
| 10 | 0.01 |
| 20 | 0.02 |
| 50 | 0.05 |
| 100 | 0.1 |
| 200 | 0.2 |
| 500 | 0.5 |
| 1000 | 1 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the conversion factor from µCi to mCi?
1 µCi equals 0.001 mCi. To convert, multiply the value in microcuries by 0.001.
How do I convert 1 µCi to mCi?
1 µCi = 0.001 mCi. For any value, multiply by 0.001.
How do I convert mCi back to µCi?
Divide by the same factor — or equivalently, multiply by 1000. So 1 mCi = 1000 µCi.
When would I need to convert microcurie to millicurie?
Radioactivity (activity) conversions between µCi and mCi are routine in health physics, nuclear medicine ordering, environmental monitoring, radiopharmacy and reactor/accelerator-source documentation. The becquerel (Bq) is the SI unit; the curie (Ci) is the legacy unit (1 Ci ≡ 3.7×10¹⁰ Bq exactly). This category is strictly activity (decays per second) — it does NOT cover absorbed dose (Gy, rad), dose equivalent (Sv, rem), exposure or dose rate, all of which are different physical quantities and live in separate categories.
Is the conversion exact?
The factor shown is precise to at least 7 significant figures. For most process-engineering work this is far better than instrument accuracy. For metrology or trade applications, refer to the relevant national standard (NIST, BIPM, ISO 80000).