Converter group
Radiology Converters
Radiation - Absorbed Dose Converter
Result
... Rad = ... Gray
Find the units to convert
Rad to Gray Converter
Use this page to convert rad values into gray, with background details, formulas, a worked example, and a quick conversion table.
Conversion formula
1 rad = 0.01 Gy
1 Gy = 100 rad
Example: 1 rad = 0.01 Gy
Rad
Defined as the absorption of 100 ergs of energy per gram of matter, equal to 0.01 gray.
History: Acronym for Radiation Absorbed Dose. Established in 1953 as a replacement for the roentgen.
Current use: Still frequently used in the United States, though officially discouraged in favor of the gray.
Also written as rad, rads.
Gray
Defined as the absorption of one joule of radiation energy per kilogram of matter.
History: Named after Louis Harold Gray, a pioneer in the field of radiobiology. Adopted by the CGPM in 1975.
Current use: The primary international unit used in radiotherapy, radiation protection, and radiobiology.
Also written as Gy, grays.
Rad to Gray table
| Rad [rad] | Gray [Gy] |
|---|---|
| 0.01 rad | 0.0001 Gy |
| 0.1 rad | 0.001 Gy |
| 1 rad | 0.01 Gy |
| 2 rad | 0.02 Gy |
| 5 rad | 0.05 Gy |
| 10 rad | 0.1 Gy |
| 20 rad | 0.2 Gy |
| 50 rad | 0.5 Gy |
| 100 rad | 1 Gy |
Frequently asked questions
How many Gray (Gy) are in one Rad (rad)?
One Rad equals 0.01 Gray.
How do you convert Rad to Gray?
Multiply the Rad value by 0.01 to get the result in Gray.
How do you convert Gray back to Rad?
Multiply the Gray value by 100 to get back to Rad.
What is 1 Rad in Gray?
1 Rad equals 0.01 Gray.