Radioactivity
BqtomCi
Convert becquerels (Bq) to millicuries (mCi).
Factor1 Bq = 2.702703e-8 mCi
Converter
Bq
Accepts numbers or expressions, e.g. 150 + 14.7
Result
mCi
Rendered to 6 significant figures.
Formula
Formula
mCi = Bq × 2.702703e-8
Multiply any value in becquerels by 2.702703e-8 to obtain the value in millicuries.
Worked example
Convert 1.00000e+6 Bq to mCi.
- 01Start with 1.00000e+6 Bq.
- 02Multiply by the conversion factor: 1.00000e+6 × 2.702703e-8 = 0.027027 mCi.
Result1.00000e+6 Bq = 0.027027 mCi
Conversion table
| Bq | mCi |
|---|---|
| 1 | 2.7027e-8 |
| 2 | 5.4054e-8 |
| 5 | 1.3514e-7 |
| 10 | 2.7027e-7 |
| 20 | 5.4054e-7 |
| 50 | 1.3514e-6 |
| 100 | 2.7027e-6 |
| 200 | 5.4054e-6 |
| 500 | 1.3514e-5 |
| 1000 | 2.7027e-5 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the conversion factor from Bq to mCi?
1 Bq equals 2.702703e-8 mCi. To convert, multiply the value in becquerels by 2.702703e-8.
How do I convert 1 Bq to mCi?
1 Bq = 2.7027e-8 mCi. For any value, multiply by 2.702703e-8.
How do I convert mCi back to Bq?
Divide by the same factor — or equivalently, multiply by 3.7e+7. So 1 mCi = 3.7e+7 Bq.
When would I need to convert becquerel to millicurie?
Radioactivity (activity) conversions between Bq 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).