Millicuries to Curies Converter
Enter the radioactive activity in millicuries below to convert it to curies.
Convert Millicuries to Curies
Enter a value in millicuries (mCi) to convert to curies (Ci).
Millicurie to Curie Conversion Table
Table showing various millicurie measurements converted to curies. Click any preset value or arrow to load it into the converter.
How to Convert Millicuries to Curies
To convert millicuries to curies, multiply the radioactive activity by the following conversion ratio: 0.001 curies/millicurie.
Since one millicurie is equal to 0.001 curies, you can use this simple formula to convert:
The radioactive activity in curies is equal to the radioactive activity in millicuries multiplied by 0.001.
For example, here's how to convert 5 millicuries to curies using the formula above.
How Many Curies Are in a Millicurie?
There are 0.001 curies in a millicurie, which is why we use this value in the formula above.
Our millicurie to curie calculator automatically converts your radioactive activity measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
Millicuries and curies are both units used to measure radioactive activity. Keep reading to learn more about each unit.
What Is a Millicurie?
A millicurie is a unit of radioactive activity equal to 37,000,000 becquerels (Bq), the base unit for radioactive activity. Equal to 37 Megabecquerels (3.7×10⁷ Bq). [1]
The millicurie is classified as a standard unit of radioactive activity. Millicuries can be abbreviated as mCi; for example, 1 millicurie can be written as 1 mCi.
In the metric system, "milli" is the standard SI prefix for thousandths, or 10⁻³. This makes the millicurie (mCi) a convenient decimal multiple of the becquerel (Bq).
In practice, millicuries (mCi) are widely used across large-scale industrial, bulk, and macro-level radioactive activity specifications within international standard workflows, engineering documentation, and technical data sheets.
What Is a Curie?
A curie is a unit of radioactive activity equal to 37,000,000,000 becquerels (Bq), the base unit for radioactive activity. Traditional radioactivity unit equal to 3.7×10¹⁰ Becquerels (37 GBq). [2]
The curie is classified as a standard unit of radioactive activity. Curies can be abbreviated as Ci; for example, 1 curie can be written as 1 Ci.
When working with curies (Ci) in formulas or technical specifications, always verify whether your target system uses SI metric, US customary, or British imperial standards.
In practice, curies (Ci) are widely used across large-scale industrial, bulk, and macro-level radioactive activity specifications within international standard workflows, engineering documentation, and technical data sheets.
When converting radioactive activity between millicuries (mCi) and curies (Ci), keep full floating-point precision (1 mCi = 0.001 Ci; 1 Ci = 1,000 mCi) during intermediate calculations and round only the final curie figure to match your instrument tolerance.
More Millicurie & Curie Conversions
Need to calculate in the opposite direction? Use our curies to millicuries calculator to switch your starting unit immediately. You can also explore related tools such as converting curies to millicuries, converting becquerels to kilobecquerels, or converting kilobecquerels to becquerels.
Convert from Millicuries
Frequently Asked Questions
References
- [1]NIST OWM StandardNIST OWM (SI Units — Length)·Radiation-Activity Metrology Standard — Millicuries (mCi) to Curies (Ci)
- [2]BIPM SpecificationBIPM (SI Base Unit: Metre (m))·Unit Specifications: Millicurie (mCi) & Curie (Ci)
- [3]NIST HB 133 ReferenceNIST HB 133 (NIST Handbook 133 (2019 Ed.))·Conversion Factors & Mathematical Basis (mCi to Ci)