Radioactivity
GBqtoµCi
Convert gigabecquerels (GBq) to microcuries (µCi).
Factor1 GBq = 27027.03 µCi
Converter
GBq
Accepts numbers or expressions, e.g. 150 + 14.7
Result
µCi
Rendered to 6 significant figures.
Formula
Formula
µCi = GBq × 27027.03
Multiply any value in gigabecquerels by 27027.03 to obtain the value in microcuries.
Worked example
Convert 1 GBq to µCi.
- 01Start with 1 GBq.
- 02Multiply by the conversion factor: 1 × 27027.03 = 27027 µCi.
Result1 GBq = 27027 µCi
Conversion table
| GBq | µCi |
|---|---|
| 1 | 27027 |
| 2 | 54054 |
| 5 | 1.3514e+5 |
| 10 | 2.7027e+5 |
| 20 | 5.4054e+5 |
| 50 | 1.3514e+6 |
| 100 | 2.7027e+6 |
| 200 | 5.4054e+6 |
| 500 | 1.3514e+7 |
| 1000 | 2.7027e+7 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the conversion factor from GBq to µCi?
1 GBq equals 27027.03 µCi. To convert, multiply the value in gigabecquerels by 27027.03.
How do I convert 1 GBq to µCi?
1 GBq = 27027 µCi. For any value, multiply by 27027.03.
How do I convert µCi back to GBq?
Divide by the same factor — or equivalently, multiply by 3.7e-5. So 1 µCi = 3.7e-5 GBq.
When would I need to convert gigabecquerel to microcurie?
Radioactivity (activity) conversions between GBq and µCi 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).