Radiation - Absorbed Dose Converter
Absorbed dose is the energy deposited by ionising radiation per unit mass of material. The SI unit is the gray (Gy), one joule per kilogram; the older rad equals 0.01 Gy.
1 Gray = 100 Rad
How to convert Gray to Rad
One Gray equals 100 Rad, so multiply any value in Gy by 100 to get rad. To convert back, divide by 100 — or multiply by 0.01.
rad = Gy × 100
Example: 25 Gy × 100 = 2,500 rad.
Watch out: Absorbed dose does not account for biological effect. For health risk, use the Radiation Dose Equivalent converter (sieverts).
Gray to Rad table
| Gray (Gy) | Rad (rad) |
|---|---|
| 1 | 100 |
| 2 | 200 |
| 3 | 300 |
| 4 | 400 |
| 5 | 500 |
| 10 | 1,000 |
| 15 | 1,500 |
| 20 | 2,000 |
| 25 | 2,500 |
| 50 | 5,000 |
| 75 | 7,500 |
| 100 | 10,000 |
| 250 | 25,000 |
| 500 | 50,000 |
| 1,000 | 100,000 |
Rad to Gray table
| Rad (rad) | Gray (Gy) |
|---|---|
| 1 | 0.01 |
| 2 | 0.02 |
| 3 | 0.03 |
| 4 | 0.04 |
| 5 | 0.05 |
| 10 | 0.1 |
| 15 | 0.15 |
| 20 | 0.2 |
| 25 | 0.25 |
| 50 | 0.5 |
| 75 | 0.75 |
| 100 | 1 |
| 250 | 2.5 |
| 500 | 5 |
| 1,000 | 10 |
Radiation - Absorbed Dose units at a glance
All 11 units this converter supports, each expressed in Gray (Gy) and the other way round.
| Unit | Symbol | 1 unit in Gy | 1 Gy in unit |
|---|---|---|---|
| Gray | Gy | 1 | 1 |
| Milligray | mGy | 0.001 | 1,000 |
| Microgray | µGy | 0.000001 | 1,000,000 |
| Nanogray | nGy | 1e-9 | 1,000,000,000 |
| Kilogray | kGy | 1,000 | 0.001 |
| Megagray | MGy | 1,000,000 | 0.000001 |
| Rad | rad | 0.01 | 100 |
| Millirad | mrad | 0.00001 | 100,000 |
| Joule/Kilogram | J/kg | 1 | 1 |
| Erg/Gram | erg/g | 0.0001 | 10,000 |
| Parker | parker | 0.01 | 100 |
Where radiation - absorbed dose conversions are used
Radiotherapy treatment planning, radiation sterilisation, and dosimetry.
Frequently asked questions
What is 1 Gray in Rad?
1 Gray (Gy) is 100 Rad (rad).
What is 1 Rad in Gray?
1 Rad (rad) is 0.01 Gray (Gy).
How do I convert Gray to Rad?
Multiply the value in Gray by 100. For example, 5 Gy × 100 = 500 rad. To go the other way, divide by 100.
How many units does the radiation - absorbed dose converter support?
It converts between 11 units: Gray, Milligray, Microgray, Nanogray, Kilogray, Megagray, Rad, Millirad, Joule/Kilogram, Erg/Gram, Parker.
What should I watch out for when converting radiation - absorbed dose?
Absorbed dose does not account for biological effect. For health risk, use the Radiation Dose Equivalent converter (sieverts).
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Figures on this page are calculated with the same conversion factors as the converter above and shown to up to 10 significant figures. See our disclaimer before relying on a result in a professional or safety-critical context.