Convert Millirem to Gray
Input the number of millirem you want to convert to grays.
How to Convert Millirem to Grays
The millirem and gray are both units of radiation dose. By definition, 1 gray equals exactly 100000 millirem. This means to convert millirem to grays, you divide by 100000.
Formula
Step-by-Step Example
Convert 5 mrem to grays:
We need to convert millirem to grays
Since 1 Gy = 100000 mrem, divide by 100000
5 ÷ 100000 = 5e-5
5 mrem = 5e-5 Gy
Millirem to Gray Conversion Table
Quick reference table for common millirem to gray conversions. Click any value for detailed calculation.
| Millirem (mrem) | Grays (Gy) |
|---|---|
| 0.1 mrem | 1e-6 Gy |
| 0.5 mrem | 5e-6 Gy |
| 1 mrem | 1e-5 Gy |
| 2 mrem | 2e-5 Gy |
| 5 mrem | 5e-5 Gy |
| 10 mrem | 0.0001 Gy |
| 25 mrem | 0.00025 Gy |
| 50 mrem | 0.0005 Gy |
| 100 mrem | 0.001 Gy |
About These Units
Millirem (mrem)
A millirem (mrem) equals 0.001 rem or 10 μSv. US dosimetry standard: natural background 300-400 mrem/year, occupational limit 5,000 mrem/year, public limit 100 mrem/year above background. Chest X-ray: ~2 mrem.
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 millirem to grays?
To convert millirem to grays, divide the value by 100000. For example, 10 mrem = 0.0001 Gy.
How many grays are in 1 millirem?
1 millirem equals 1e-5 grays.
What is the formula for millirem to grays?
The formula is: Gy = mrem ÷ 100000.