Rad to Gray Converter
Convert Rad to Gray.
Rad → Gray (Gy)
Enter a value in Rad•1 Rad = 0.01 Gray (Gy)
Rad
Decimals supported.
Result
Gray (Gy)
—
Enter a value to convert Rad to Gray (Gy).
How to convert Rad to Gray (Gy)?
Rad is an older absorbed dose unit. Gray (Gy) is the SI unit. The relationship is:
- 100 rad = 1 Gy
- 1 rad = 0.01 Gy
To convert Rad to Gray (Gy), divide the value by 100.
Formula: Gray (Gy) = Rad ÷ 100
Step-by-Step Calculation
- 1Take the number of Rad you want to convert (e.g., 250 rad).
- 2Divide that value by 100.
- 3The result is the value in Gray (Gy). (Example: 250 ÷ 100 = 2.5 Gy).
How to use this converter?
Enter rad and instantly get gray (Gy)—useful when converting older radiation data into SI units.
Tip: Keep units clear
Rad and gray are absorbed dose units. If you’re dealing with biological effects, you may see rem and sievert instead.
Common Rad to Gray Conversions
| Rad Input | Gray (Gy) Result |
|---|---|
| 1 rad | 0.01 Gy |
| 10 rad | 0.1 Gy |
| 25 rad | 0.25 Gy |
| 50 rad | 0.5 Gy |
| 75 rad | 0.75 Gy |
| 100 rad | 1 Gy |
| 200 rad | 2 Gy |
| 250 rad | 2.5 Gy |
| 500 rad | 5 Gy |
| 1000 rad | 10 Gy |
Frequently Asked Questions
Q
How do I convert rad to gray?
Divide rad by 100 to get gray (Gy).
Q
How many Gy is 100 rad?
100 rad equals 1 Gy.
Q
Is this conversion exact?
Yes—1 Gy is exactly 100 rad.
Q
What is rad?
Rad is an older absorbed dose unit; 1 rad equals 0.01 joule per kilogram.
Q
Why do some documents still use rad?
Older medical and radiation references may use rad, while modern SI usage prefers gray (Gy).