Convert Rad to Gray
Live bidirectional calculator for Rads (rad) and Grays (Gy) with verified formula and conversion charts.
Absorbed Radiation Dose4 units
How the Calculation Works (Linear Scaling)
Since 1 Gray = 100 Rads, divide the value in Rads by 100.
Rad to Gray Conversion Table
Precomputed values for quick reference and printing.
| Rad | Gray |
|---|---|
| 1 rad | 0.01 Gy |
| 2 rad | 0.02 Gy |
| 3 rad | 0.03 Gy |
| 4 rad | 0.04 Gy |
| 5 rad | 0.05 Gy |
| 6 rad | 0.06 Gy |
| 7 rad | 0.07 Gy |
| 8 rad | 0.08 Gy |
| 9 rad | 0.09 Gy |
| 10 rad | 0.1 Gy |
| 15 rad | 0.15 Gy |
| 20 rad | 0.2 Gy |
| 25 rad | 0.25 Gy |
| 30 rad | 0.3 Gy |
| 40 rad | 0.4 Gy |
| 50 rad | 0.5 Gy |
| 75 rad | 0.75 Gy |
| 100 rad | 1 Gy |
| Gray | Rad |
|---|---|
| 1 Gy | 100 rad |
| 2 Gy | 200 rad |
| 3 Gy | 300 rad |
| 4 Gy | 400 rad |
| 5 Gy | 500 rad |
| 6 Gy | 600 rad |
| 7 Gy | 700 rad |
| 8 Gy | 800 rad |
| 9 Gy | 900 rad |
| 10 Gy | 1000 rad |
| 15 Gy | 1500 rad |
| 20 Gy | 2000 rad |
| 25 Gy | 2500 rad |
| 30 Gy | 3000 rad |
| 40 Gy | 4000 rad |
| 50 Gy | 5000 rad |
| 75 Gy | 7500 rad |
| 100 Gy | 10000 rad |
๐ Standard Benchmark Reference Values
Energy deposition of 100 ergs per gram (1 rad = 0.01 Gy).
Exact RatioAbout Rad (rad)
A non-SI unit of absorbed radiation dose defined as 100 ergs of energy per gram of matter, or exactly 0.01 gray (1 rad = 0.01 Gy).
History: Proposed in 1953 by the ICRU as an acronym for "radiation absorbed dose" to provide a material-independent measure of absorbed energy.
Common Uses: United States military radiation hardened electronics specifications, legacy radiation therapy literature.
About Gray (Gy)
The SI coherent derived unit of absorbed radiation dose, defined as the absorption of 1 joule of ionizing radiation energy per kilogram of matter (1 Gy = 1 J/kg).
History: Named in 1975 after British radiobiologist Louis Harold Gray (1905โ1965), pioneer in the measurement of radiation absorption in biological tissue.
Common Uses: Radiation oncology treatment dose prescriptions (e.g. 50โ70 Gy tumor dose), industrial radiation crosslinking, food irradiation processing.
โ Frequently Asked Questions
How many Grays are in 1 Rad?
There are exactly 0.01 Grays in 1 Rad (1 rad = 0.01 Gy).
What is the formula to convert Rad to Gray?
The formula is: Gray = Rad / 100. Since 1 Gray = 100 Rads, divide the value in Rads by 100.
How do I convert 1 rad to Gy manually?
To convert 1 rad to Gy: apply the formula Gray = Rad / 100. Substituting gives: 1 / 100 = 0.01 Gy.