Convert Gray to Rad
Convert grays to rads by entering a value below.
How to Convert Grays to Rads
The gray and rad are both units of radiation dose. By definition, 1 gray equals exactly 100 rads. This means to convert grays to rads, you multiply by 100.
Formula
Step-by-Step Example
Convert 5 Gy to rads:
We need to convert grays to rads
Since 1 Gy = 100 rad, multiply by 100
5 × 100 = 500
5 Gy = 500 rad
Gray to Rad Conversion Table
Quick reference table for common gray to rad conversions. Click any value for detailed calculation.
| Grays (Gy) | Rads (rad) |
|---|---|
| 1 Gy | 100 rad |
| 2 Gy | 200 rad |
| 5 Gy | 500 rad |
| 10 Gy | 1000 rad |
| 15 Gy | 1500 rad |
| 20 Gy | 2000 rad |
| 25 Gy | 2500 rad |
| 50 Gy | 5000 rad |
| 100 Gy | 10000 rad |
About These Units
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.
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.
Frequently Asked Questions
How do I convert grays to rads?
To convert grays to rads, multiply the value by 100. For example, 10 Gy = 1000 rad.
How many rads are in 1 gray?
1 gray equals 100 rads.
What is the formula for grays to rads?
The formula is: rad = Gy × 100.