Rem to Millirem Converter
Enter the radiation dose in rem below to convert it to millirem.
Convert Rem to Millirem
Enter a value in rem (rem) to convert to millirem (mrem).
Rem to Millirem Conversion Table
Table showing various rem measurements converted to millirem. Click any preset value or arrow to load it into the converter.
| Rem (rem) | Millirem (mrem) |
|---|---|
| 1 rem | 1,000 mrem |
| 2 rem | 2,000 mrem |
| 2.5 rem | 2,500 mrem |
| 5 rem | 5,000 mrem |
| 10 rem | 10,000 mrem |
| 15 rem | 15,000 mrem |
| 20 rem | 20,000 mrem |
| 25 rem | 25,000 mrem |
| 30 rem | 30,000 mrem |
| 50 rem | 50,000 mrem |
How to Convert Rem to Millirem
To convert rem to millirem, multiply the radiation dose by the following conversion ratio: 1,000 millirem/rem.
Since one rem is equal to 1,000 millirem, you can use this simple formula to convert:
The radiation dose in millirem is equal to the radiation dose in rem multiplied by 1,000.
For example, here's how to convert 5 rem to millirem using the formula above.
How Many Millirem Are in a Rem?
There are 1,000 millirem in a rem, which is why we use this value in the formula above.
Our rem to millirem calculator automatically converts your radiation dose measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
Rem and millirem are both units used to measure radiation dose. Keep reading to learn more about each unit.
What Is a Rem?
A rem is a unit of radiation dose equal to 1/100 of a sievert (0.01 Sv). Traditional biological dose unit equal to 0.01 Sieverts (10 mSv). [1]
The rem is classified as a standard unit of radiation dose. Rem can be abbreviated as rem; for example, 1 rem can be written as 1 rem.
When working with rem (rem) in formulas or technical specifications, always verify whether your target system uses SI metric, US customary, or British imperial standards.
In practice, rem (rem) are widely used across fine-tolerance laboratory, analytical, and micro-scale radiation dose measurements within international standard workflows, engineering documentation, and technical data sheets.
What Is a Millirem?
A millirem is a unit of radiation dose equal to 1/100,000 of a sievert (0.00001 Sv). US occupational dosimetry unit (1 mrem = 10 µSv = 0.01 mSv). [2]
The millirem is classified as a standard unit of radiation dose. Millirem can be abbreviated as mrem; for example, 1 millirem can be written as 1 mrem.
In the metric system, "milli" is the standard SI prefix for thousandths, or 10⁻³. This makes the millirem (mrem) a convenient decimal multiple of the sievert (Sv).
In practice, millirem (mrem) are widely used across fine-tolerance laboratory, analytical, and micro-scale radiation dose measurements within international standard workflows, engineering documentation, and technical data sheets.
When converting radiation dose between rem (rem) and millirem (mrem), keep full floating-point precision (1 rem = 1,000 mrem; 1 mrem = 0.001 rem) during intermediate calculations and round only the final millirem figure to match your instrument tolerance.
More Rem & Millirem Conversions
Need to calculate in the opposite direction? Use our millirem to rem calculator to switch your starting unit immediately. You can also explore related tools such as converting millirem to rem, converting rem to sieverts, or converting sieverts to millisieverts.
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Frequently Asked Questions
References
- [1]NIST OWM StandardNIST OWM (SI Units — Length)·Radiation Metrology Standard — Rem (rem) to Millirem (mrem)
- [2]BIPM SpecificationBIPM (SI Base Unit: Metre (m))·Unit Specifications: Rem (Roentgen Equivalent Man) (rem) & Millirem (mrem)
- [3]NIST HB 133 ReferenceNIST HB 133 (NIST Handbook 133 (2019 Ed.))·Conversion Factors & Mathematical Basis (rem to mrem)