Gy → rad
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
About this calculator
The Gy to rad converter calculates radiation doses between Gray (Gy) and rad units. Gray is the SI unit for absorbed dose, while rad is an older unit still referenced in historical contexts. The formula is straightforward: 1 Gy equals 100 rad. Multiply the Gy value by 100 to get the equivalent in rad.
This conversion is useful in fields like radiation therapy, nuclear safety, and environmental studies. For instance, medical treatments often use Gy, but legacy reports might use rad. This tool helps compare historical data with modern standards.
Important: Ensure the input values match the intended unit. Avoid using this calculator for sterilizing radiation or other related quantities. Always consult a radiation safety professional for critical interpretations of results.
Frequently asked questions
Why are there two units for absorbed dose?
Gray (SI) is the international standard, while rad is an obsolete unit still referenced in historical reports. Conversion helps compare old and modern data.
How to use the calculator safely?
Enter only valid numerical values and verify the conversion matches your study context. Avoid using it for dosimetry calculations without technical supervision.
What does 1 Gy mean in practical terms?
1 Gy equals 1 joule of energy absorbed per kilogram of tissue. It's a common dose in radiation therapy and protection studies.
Can I convert multiple values at once?
The calculator processes one value at a time. For data lists, use 'batch calculation' features in advanced versions or spreadsheets.