Radioactivity
GBqtomCi
Convert gigabecquerels (GBq) to millicuries (mCi).
Factor1 GBq = 27.02703 mCi
Converter
GBq
Accepts numbers or expressions, e.g. 150 + 14.7
Result
mCi
Rendered to 6 significant figures.
Formula
Formula
mCi = GBq × 27.02703
Multiply any value in gigabecquerels by 27.02703 to obtain the value in millicuries.
Worked example
Convert 1 GBq to mCi.
- 01Start with 1 GBq.
- 02Multiply by the conversion factor: 1 × 27.02703 = 27.027 mCi.
Result1 GBq = 27.027 mCi
Conversion table
| GBq | mCi |
|---|---|
| 1 | 27.027 |
| 2 | 54.054 |
| 5 | 135.14 |
| 10 | 270.27 |
| 20 | 540.54 |
| 50 | 1351.4 |
| 100 | 2702.7 |
| 200 | 5405.4 |
| 500 | 13514 |
| 1000 | 27027 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the conversion factor from GBq to mCi?
1 GBq equals 27.02703 mCi. To convert, multiply the value in gigabecquerels by 27.02703.
How do I convert 1 GBq to mCi?
1 GBq = 27.027 mCi. For any value, multiply by 27.02703.
How do I convert mCi back to GBq?
Divide by the same factor — or equivalently, multiply by 0.037. So 1 mCi = 0.037 GBq.
When would I need to convert gigabecquerel to millicurie?
Radioactivity (activity) conversions between GBq 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).