Convert Gray to Rad

Convert grays to rads by entering a value below.

1 Gy (grays) = 100 rad (rads)

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

rads = grays × 100

Step-by-Step Example

Convert 5 Gy to rads:

1
Convert 5 Gy to rads

We need to convert grays to rads

2
Apply the formula

Since 1 Gy = 100 rad, multiply by 100

5 × 100 = 500

Answer

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.