☢️ Radioactivity Converter
Convert radioactivity (activity) units, becquerel, kilobecquerel, megabecquerel, gigabecquerel, curie, millicurie and microcurie. 1 curie = 3.7×10¹⁰ Bq.
1 Bq = 0.001 kBq
1 becquerels = 0.001 kilobecquerels
1 × 0.001 = 0.001
1 Bq equals 0.001 kBq, so multiplying by 0.001 converts the value. The result describes the exact same quantity, only the measuring stick changes.
Popular radioactivity conversions
All radioactivity units
| Unit | Symbol | Definition |
|---|---|---|
| Becquerel | Bq | The SI unit of radioactivity, one nuclear decay (disintegration) per second. A very small unit: a banana is about 15 Bq, a human body around 4,000 Bq. |
| Kilobecquerel | kBq | One thousand becquerels (10³ Bq). A convenient scale for environmental and food-safety measurements. |
| Megabecquerel | MBq | One million becquerels (10⁶ Bq). Nuclear-medicine doses are usually given in megabecquerels, e.g. a few hundred MBq for a scan. |
| Gigabecquerel | GBq | One billion becquerels (10⁹ Bq). Used for stronger medical and industrial sources. |
| Curie | Ci | The traditional unit, defined as exactly 3.7×10¹⁰ Bq, originally the activity of one gram of radium-226. Still common in the US and in older literature. |
| Millicurie | mCi | One-thousandth of a curie (3.7×10⁷ Bq = 37 MBq). A typical unit for nuclear-medicine doses in countries using the curie. |
| Microcurie | µCi | One-millionth of a curie (3.7×10⁴ Bq = 37 kBq). Used for small check sources and laboratory quantities. |
| Rutherford | Rd | An old unit equal to 10⁶ decays per second (1 MBq). Largely obsolete but occasionally seen in historical texts. |
Frequently asked questions
How do I convert radioactivity units?
Choose your two units in the converter above and type a value, the result updates instantly, entirely in your browser. All 8 radioactivity units on this page are interchangeable, so you can convert in either direction.
Which radioactivity units can I convert here?
This converter supports 8 radioactivity units: Becquerel (Bq), Kilobecquerel (kBq), Megabecquerel (MBq), Gigabecquerel (GBq) and 4 more. Pick any two to convert between them.
What is the most common radioactivity conversion?
One of the most-used radioactivity conversions is Curies to Becquerels (Ci → Bq). Every radioactivity pair we support is linked below, each with its own formula and table.
Is this Radioactivity Converter free and private?
Yes. It is free with no sign-up, uses the exact internationally defined conversion factors, and computes every result locally in your browser, nothing you type is uploaded, and the page keeps working offline.