Authoritative definitions of the International System of Units and SI prefixes.
Dedicated unit pair
Rad to Milligray
Convert rad to mGy instantly, then review the formula, assumptions, and rounding guidance.
Radiation unitsInstant result
Decimals
Formula result = input × 0.01 ÷ 0.001. 1 rad = 10 mGy
Common examples
One value, several units
Gray0.01 Gy
Milligray10 mGy
Joules per kilogram0.01 J/kg
Conversion table
| rad | mGy |
|---|---|
| 1 rad | 10 mGy |
| 2 rad | 20 mGy |
| 5 rad | 50 mGy |
| 10 rad | 100 mGy |
| 25 rad | 250 mGy |
| 50 rad | 500 mGy |
| 100 rad | 1,000 mGy |
Conversion chart
1 rad10 mGy
5 rad50 mGy
10 rad100 mGy
25 rad250 mGy
50 rad500 mGy
Worked example
1 gray equals 100 rad.
Unit definition
Rad (rad) One rad equals 0.01 gray.
Unit history
Rad is represented here using its modern SI definition or an internationally accepted relationship to an SI base unit.
Step by step
1. Parse the value, including fractions.
2. Convert rad to gray.
3. Convert the base value to mGy and apply your display precision.
Understand the result before using it
Rad to Milligray converts a value measured in Rad (rad) into the equivalent value in Milligray (mGy). The numerical value changes because the size and definition of the selected unit changes; the underlying quantity does not.
Calculated result
The conversion follows the displayed unit relationship. Display rounding can hide additional digits, and measured inputs cannot become more accurate merely by changing units.
Formula, assumptions, and example
Formula
result = input × 0.01 ÷ 0.001
Assumptions
- Rad and Milligray represent the same absorbed dose quantity.
- The input is expressed in rad; the output is expressed in mGy.
- The unit definitions and conventional relationship shown on this page apply.
Worked example
1 rad = 10 mGy. For another value, apply the same relationship and round only to the precision your source measurement supports.
When to use it
Good uses
- Read a rad measurement in a document that expects mGy.
- Compare a rad value with a value reported in milligray.
- Check the rad-to-mGy arithmetic before copying the result into another calculation.
Limitations
Common mistakes to avoid
- Absorbed dose, equivalent dose, and activity describe different radiation quantities and are not interchangeable.
- Round the output to a precision justified by the original measurement.
- Verify safety-critical, regulated, laboratory, and contractual conversions against the controlling standard.
Sources and further reading
These references explain the underlying standards or provide authoritative context. Your own contract, institution, clinician, product documentation, local code, or governing standard may be the controlling source.
Guidance on unit names, symbols, conversions, and numerical presentation.
Questions about this calculation
How do I convert Rad to Milligray?
result = input × 0.01 ÷ 0.001 Using the displayed relationship, 1 rad equals 10 mGy.
How many Milligray are in one Rad?
One Rad is 10 Milligray. The displayed digits may be rounded.
Can I reverse the rad to mGy conversion?
Yes. Swap the source and target units in the converter. The reverse relationship converts mGy back to rad.
Is the Rad to Milligray result exact?
The conversion follows the displayed unit relationship. Display rounding can hide additional digits, and measured inputs cannot become more accurate merely by changing units.