Rad to Gray Converter

Radiation Converter

10 units available

Decimals:

From

To

0.01

1 rad = 0.01 Gy

Formula:

Gy = rad × 0.01

With your value: 1 rad = 0.01 Gy

Other Rad to Gray conversions

2 rad to Gy 3 rad to Gy 4 rad to Gy 5 rad to Gy 6 rad to Gy 7 rad to Gy 8 rad to Gy

Rad to Gray Conversion Table

Rad (rad)	Gray (Gy)
0.5	0.005
1	0.01
2	0.02
5	0.05
10	0.1
15	0.15
20	0.2
25	0.25
50	0.5
100	1
250	2.5
500	5
1000	10

Gray to Rad Conversion Table

Gray (Gy)	Rad (rad)
0.5	50
1	100
2	200
5	500
10	1,000
15	1,500
20	2,000
25	2,500
50	5,000
100	10,000
250	25,000
500	50,000
1000	100,000

Where these values come from

Every factor on this page is traced to the document that defines it. See the full provenance dataset or our methodology.

Rad (rad)

Radiation

Exact conversion

Gray and sievert are coherent SI units (J/kg). Rad and rem are exactly 0.01 Gy and 0.01 Sv; the curie is exactly 3.7 × 10¹⁰ Bq.

Source: BIPM, The International System of Units (SI), 9th edition, 2019 (updated 2024)

Bureau International des Poids et Mesures · Reviewed 2026-07-01

Gray (Gy)

Radiation

Exact conversion

Gray and sievert are coherent SI units (J/kg). Rad and rem are exactly 0.01 Gy and 0.01 Sv; the curie is exactly 3.7 × 10¹⁰ Bq.

Source: BIPM, The International System of Units (SI), 9th edition, 2019 (updated 2024)

Bureau International des Poids et Mesures · Reviewed 2026-07-01

How to Convert Rad to Gray

To convert from Rad (rad) to Gray (Gy), multiply the value by 0.01.

Formula: Gy = rad × 0.01

Reverse: rad = Gy × 100

Step-by-Step Example

Start with your value in Rad. For example: 5 rad
Multiply by the conversion factor: 5 x 0.01
The result is: 0.05 Gy

About Rad

The rad is a non-SI unit of absorbed radiation dose. One rad is equal to 0.01 gray.

Common uses: legacy radiation monitoring, industrial radiation.

About Gray

The gray (Gy) is the SI unit of absorbed radiation dose. It measures the amount of energy deposited in a mass of matter by ionizing radiation.

Common uses: medicine, nuclear physics, radiotherapy.

Frequently Asked Questions

How many Gray are in 1 Rad?

There are exactly 0.01 Gray in 1 Rad. This means the conversion factor from Rad to Gray is 0.01.

What is the formula to convert Rad to Gray?

The formula to convert Rad to Gray is: Gy = rad × 0.01. For example, to convert 10 Rad to Gray, you would multiply 10 by 0.01.

What is a Rad?