Convert Rad to Gray
Enter the number of rads that you want to convert to grays.
How to Convert Rads to Grays
The rad and gray are both units of radiation dose. By definition, 1 gray equals exactly 100 rads. This means to convert rads to grays, you divide by 100.
Formula
Step-by-Step Example
Convert 5 rad to grays:
We need to convert rads to grays
Since 1 Gy = 100 rad, divide by 100
5 ÷ 100 = 0.05
5 rad = 0.05 Gy
Rad to Gray Conversion Table
Quick reference table for common rad to gray conversions. Click any value for detailed calculation.
| Rads (rad) | Grays (Gy) |
|---|---|
| 1 rad | 0.01 Gy |
| 2 rad | 0.02 Gy |
| 5 rad | 0.05 Gy |
| 10 rad | 0.1 Gy |
| 15 rad | 0.15 Gy |
| 20 rad | 0.2 Gy |
| 25 rad | 0.25 Gy |
| 50 rad | 0.5 Gy |
| 100 rad | 1 Gy |
About These Units
Rad (rad)
The rad (Radiation Absorbed Dose) is the traditional unit of absorbed dose. One gray = 100 rads exactly. One rad = 100 ergs/gram = 0.01 J/kg. Still used in US medical and nuclear industries. One rad = one centigray = one rem for gamma/X-rays.
Gray (Gy)
The gray (Gy) is the SI unit of absorbed dose: energy deposited per unit mass (1 Gy = 1 J/kg). Named after Louis Harold Gray. For gamma/X-rays and beta particles, 1 Gy ≈ 1 Sv (quality factor Q=1). Radiation therapy total dose: 40-80 Gy.
Frequently Asked Questions
How do I convert rads to grays?
To convert rads to grays, divide the value by 100. For example, 10 rad = 0.1 Gy.
How many grays are in 1 rad?
1 rad equals 0.01 grays.
What is the formula for rads to grays?
The formula is: Gy = rad ÷ 100.