Converter group
Radiology Converters
Radiation - Absorbed Dose Converter
Result
... Gray = ... Rad
Find the units to convert
Gray to Rad Converter
Use this page to convert gray values into rad, with background details, formulas, a worked example, and a quick conversion table.
Conversion formula
1 Gy = 100 rad
1 rad = 0.01 Gy
Example: 1 Gy = 100 rad
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
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 to Rad table
| Gray [Gy] | Rad [rad] |
|---|---|
| 0.01 Gy | 1 rad |
| 0.1 Gy | 10 rad |
| 1 Gy | 100 rad |
| 2 Gy | 200 rad |
| 5 Gy | 500 rad |
| 10 Gy | 1,000 rad |
| 20 Gy | 2,000 rad |
| 50 Gy | 5,000 rad |
| 100 Gy | 10,000 rad |
Frequently asked questions
How many Rad (rad) are in one Gray (Gy)?
One Gray equals 100 Rad.
How do you convert Gray to Rad?
Multiply the Gray value by 100 to get the result in Rad.
How do you convert Rad back to Gray?
Multiply the Rad value by 0.01 to get back to Gray.
What is 1 Gray in Rad?
1 Gray equals 100 Rad.