Curies to Millicuries Converter
Enter the radioactive activity in curies below to convert it to millicuries.
Convert Curies to Millicuries
Enter a value in curies (Ci) to convert to millicuries (mCi).
Curie to Millicurie Conversion Table
Table showing various curie measurements converted to millicuries. Click any preset value or arrow to load it into the converter.
| Curies (Ci) | Millicuries (mCi) |
|---|---|
| 1 Ci | 1,000 mCi |
| 2 Ci | 2,000 mCi |
| 2.5 Ci | 2,500 mCi |
| 5 Ci | 5,000 mCi |
| 10 Ci | 10,000 mCi |
| 15 Ci | 15,000 mCi |
| 20 Ci | 20,000 mCi |
| 25 Ci | 25,000 mCi |
| 30 Ci | 30,000 mCi |
| 50 Ci | 50,000 mCi |
How to Convert Curies to Millicuries
To convert curies to millicuries, multiply the radioactive activity by the following conversion ratio: 1,000 millicuries/curie.
Since one curie is equal to 1,000 millicuries, you can use this simple formula to convert:
The radioactive activity in millicuries is equal to the radioactive activity in curies multiplied by 1,000.
For example, here's how to convert 5 curies to millicuries using the formula above.
How Many Millicuries Are in a Curie?
There are 1,000 millicuries in a curie, which is why we use this value in the formula above.
Our curie to millicurie calculator automatically converts your radioactive activity measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
Curies and millicuries are both units used to measure radioactive activity. Keep reading to learn more about each unit.
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). [1]
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.
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). [2]
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.
When converting radioactive activity between curies (Ci) and millicuries (mCi), keep full floating-point precision (1 Ci = 1,000 mCi; 1 mCi = 0.001 Ci) during intermediate calculations and round only the final millicurie figure to match your instrument tolerance.
More Curie & Millicurie Conversions
Need to calculate in the opposite direction? Use our millicuries to curies calculator to switch your starting unit immediately. You can also explore related tools such as converting millicuries to curies, converting becquerels to kilobecquerels, or converting kilobecquerels to becquerels.
Convert from Curies
Frequently Asked Questions
References
- [1]NIST OWM StandardNIST OWM (SI Units — Length)·Radiation-Activity Metrology Standard — Curies (Ci) to Millicuries (mCi)
- [2]BIPM SpecificationBIPM (SI Base Unit: Metre (m))·Unit Specifications: Curie (Ci) & Millicurie (mCi)
- [3]NIST HB 133 ReferenceNIST HB 133 (NIST Handbook 133 (2019 Ed.))·Conversion Factors & Mathematical Basis (Ci to mCi)