Convert Rem to Gray
Enter the number of rem that you want to convert to grays.
How to Convert Rem to Grays
The rem and gray are both units of radiation dose. By definition, 1 gray equals exactly 100 rem. This means to convert rem to grays, you divide by 100.
Formula
Step-by-Step Example
Convert 5 rem to grays:
We need to convert rem to grays
Since 1 Gy = 100 rem, divide by 100
5 ÷ 100 = 0.05
5 rem = 0.05 Gy
Rem to Gray Conversion Table
Quick reference table for common rem to gray conversions. Click any value for detailed calculation.
| Rem (rem) | Grays (Gy) |
|---|---|
| 1 rem | 0.01 Gy |
| 2 rem | 0.02 Gy |
| 5 rem | 0.05 Gy |
| 10 rem | 0.1 Gy |
| 15 rem | 0.15 Gy |
| 20 rem | 0.2 Gy |
| 25 rem | 0.25 Gy |
| 50 rem | 0.5 Gy |
| 100 rem | 1 Gy |
About These Units
Rem (rem)
The rem (Roentgen Equivalent Man) is the traditional unit of equivalent dose. One sievert = 100 rem exactly. Still used in US nuclear industry and regulations. Annual occupational limit: 5 rem/year. Natural background: 0.3 rem/year. Acute 450 rem ≈ LD50.
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.
Frequently Asked Questions
How do I convert rem to grays?
To convert rem to grays, divide the value by 100. For example, 10 rem = 0.1 Gy.
How many grays are in 1 rem?
1 rem equals 0.01 grays.
What is the formula for rem to grays?
The formula is: Gy = rem ÷ 100.