Convert Gray to Rad
Use this free converter to change gray (Gy) into rad (rad). Gray and rad both measure radiation (absorbed dose). As a quick reference, 1 Gy equals 100 rad, and 1 rad equals 0.01 Gy.
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Rad (rad)
100
1 Gy = 100 rad
Radiation (Absorbed Dose) conversion table
| Gray | Rad |
|---|---|
| 0.01 | 1 |
| 0.1 | 10 |
| 0.5 | 50 |
| 1 | 100 |
| 2 | 200 |
| 3 | 300 |
| 5 | 500 |
| 10 | 1000 |
| 20 | 2000 |
| 25 | 2500 |
| 50 | 5000 |
| 100 | 10000 |
| 1,000 | 100000 |
How to convert Gray to Rad
Multiply the gray value by 100 to get rad.
- Enter the number of gray you want to convert.
- The converter instantly shows the equivalent value in rad.
- Worked example: 15 Gy × 100 = 1500 rad.
- Use the swap button to reverse the conversion (rad to gray).
About these units
Gray (Gy)
- Definition
- The gray (Gy) is the SI unit of absorbed radiation dose, equal to one joule of energy deposited per kilogram of matter.
- History
- Named after British radiobiologist Louis Harold Gray and adopted by the CGPM in 1975, replacing the older rad.
- Current use
- Grays describe doses in radiation therapy, nuclear accidents, and radiobiology research.
Rad (rad)
- Definition
- The rad (radiation absorbed dose) is a non-SI unit of absorbed dose equal to 0.01 gray or 100 ergs per gram.
- History
- Introduced in 1953 by the International Commission on Radiation Units and Measurements; largely superseded by the gray since 1985.
- Current use
- Still encountered in US medical and nuclear-industry documentation alongside cGy; 100 rad = 1 Gy.
Frequently asked questions
How many rad are in a gray?
There are 100 rad in 1 Gy. To convert, multiply the number of gray by 100.
How do I convert gray to rad?
Multiply the gray value by 100 to get rad. For example, 10 Gy = 1000 rad.
Is this gray-to-rad converter free?
Yes. This converter is completely free, runs entirely in your browser, and requires no sign-up. Your inputs never leave your device.
Convert Gray to other radiation (absorbed dose) units
| Unit | 1 Gray equals |
|---|---|
| Milligray (mGy) | 1000 mGy |
| Centigray (cGy) | 100 cGy |
| Microgray (µGy) | 1000000 µGy |
| Rad (rad) | 100 rad |