Radioactivity
kCitomCi
Convert kilocuries (kCi) to millicuries (mCi).
Factor1 kCi = 1000000 mCi
Converter
kCi
Accepts numbers or expressions, e.g. 150 + 14.7
Result
mCi
Rendered to 6 significant figures.
Formula
Formula
mCi = kCi × 1000000
Multiply any value in kilocuries by 1000000 to obtain the value in millicuries.
Worked example
Convert 1 kCi to mCi.
- 01Start with 1 kCi.
- 02Multiply by the conversion factor: 1 × 1000000 = 1.00000e+6 mCi.
Result1 kCi = 1.00000e+6 mCi
Conversion table
| kCi | mCi |
|---|---|
| 1 | 1.0000e+6 |
| 2 | 2.0000e+6 |
| 5 | 5.0000e+6 |
| 10 | 1e+7 |
| 20 | 2e+7 |
| 50 | 5e+7 |
| 100 | 1e+8 |
| 200 | 2e+8 |
| 500 | 5e+8 |
| 1000 | 1e+9 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the conversion factor from kCi to mCi?
1 kCi equals 1000000 mCi. To convert, multiply the value in kilocuries by 1000000.
How do I convert 1 kCi to mCi?
1 kCi = 1.00000e+6 mCi. For any value, multiply by 1000000.
How do I convert mCi back to kCi?
Divide by the same factor — or equivalently, multiply by 1e-6. So 1 mCi = 1e-6 kCi.
When would I need to convert kilocurie to millicurie?
Radioactivity (activity) conversions between kCi 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).