Radioactivity
mCitoCi
Convert millicuries (mCi) to curies (Ci).
Factor1 mCi = 0.001 Ci
Converter
mCi
Accepts numbers or expressions, e.g. 150 + 14.7
Result
Ci
Rendered to 6 significant figures.
Formula
Formula
Ci = mCi × 0.001
Multiply any value in millicuries by 0.001 to obtain the value in curies.
Worked example
Convert 1000 mCi to Ci.
- 01Start with 1000 mCi.
- 02Multiply by the conversion factor: 1000 × 0.001 = 1 Ci.
Result1000 mCi = 1 Ci
Conversion table
| mCi | Ci |
|---|---|
| 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 mCi to Ci?
1 mCi equals 0.001 Ci. To convert, multiply the value in millicuries by 0.001.
How do I convert 1 mCi to Ci?
1 mCi = 0.001 Ci. For any value, multiply by 0.001.
How do I convert Ci back to mCi?
Divide by the same factor — or equivalently, multiply by 1000. So 1 Ci = 1000 mCi.
When would I need to convert millicurie to curie?
Radioactivity (activity) conversions between mCi and Ci 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).