Radioactivity
CitomCi
Convert curies (Ci) to millicuries (mCi).
Factor1 Ci = 1000 mCi
Converter
Ci
Accepts numbers or expressions, e.g. 150 + 14.7
Result
mCi
Rendered to 6 significant figures.
Formula
Formula
mCi = Ci × 1000
Multiply any value in curies by 1000 to obtain the value in millicuries.
Worked example
Convert 1 Ci to mCi.
- 01Start with 1 Ci.
- 02Multiply by the conversion factor: 1 × 1000 = 1000 mCi.
Result1 Ci = 1000 mCi
Conversion table
| Ci | mCi |
|---|---|
| 1 | 1000 |
| 2 | 2000 |
| 5 | 5000 |
| 10 | 10000 |
| 20 | 20000 |
| 50 | 50000 |
| 100 | 1.0000e+5 |
| 200 | 2.0000e+5 |
| 500 | 5.0000e+5 |
| 1000 | 1.0000e+6 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the conversion factor from Ci to mCi?
1 Ci equals 1000 mCi. To convert, multiply the value in curies by 1000.
How do I convert 1 Ci to mCi?
1 Ci = 1000 mCi. For any value, multiply by 1000.
How do I convert mCi back to Ci?
Divide by the same factor — or equivalently, multiply by 0.001. So 1 mCi = 0.001 Ci.
When would I need to convert curie to millicurie?
Radioactivity (activity) conversions between Ci 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).