Radiation Activity Converter

Convert radioactive activity between becquerels, curies, millicuries, megabecquerels, and microcuries.

Convert instantly

Enter a value and choose the units. Your answer updates as you type.

Value

From

Result

0.001 Kilobecquerel (kBq)

Educational reference only—not clinical or medical dosing advice. Dose decisions require a qualified radiation professional. Source: https://remm.hhs.gov/radmeasurement.htm

Quick reference

Becquerel (Bq)1 base units
Kilobecquerel (kBq)1000 base units
Megabecquerel (MBq)1000000 base units
Curie (Ci)37000000000 base units
Millicurie (mCi)37000000 base units
Microcurie (µCi)37000 base units

About the Radiation Activity Converter

Activity counts nuclear transformations per second, not the energy absorbed by a person. Becquerel is one disintegration per second; the curie is a historical unit equal to 3.7 × 10¹⁰ Bq. This page retains the standard SI relationship while keeping customary and legacy units explicit, which is important when a specification crosses disciplines.

Enter a value to see the conversion immediately—for example, 1 curie equals exactly 37,000 megabecquerels, or 3.7 × 10¹⁰ becquerels. For a related check, use the Radiation Dose Equivalent Converter and Radiation Exposure Converter; those tools describe a different but commonly connected quantity.

Frequently asked questions

What does the radiation activity measure?

Activity counts nuclear transformations per second, not the energy absorbed by a person. Becquerel is one disintegration per second; the curie is a historical unit equal to 3.7 × 10¹⁰ Bq.

What is a useful reference conversion for radiation activity?

1 curie equals exactly 37,000 megabecquerels, or 3.7 × 10¹⁰ becquerels.

Are the factors on this page exact?

SI prefixes and internationally defined units use their standard factors. Legacy and customary factors are retained at their published scientific definitions and may be rounded only for display.

Take this calculation further

Browse the converters calculators collection for more tools in this subject.

For a related calculation, use Radiation Exposure Converter to convert radiation exposure between coulomb per kilogram, roentgen, milliroentgen, and microcoulomb per kilogram. Alternatively, use Radiation Dose Equivalent Converter to convert radiation dose equivalent between sieverts, rem, millisieverts, microsieverts, and millirems for reference.

For the underlying method, read A Quick Guide to Radiation Units for Students.