Convert Milligray to Gray

Enter the number of milligrays that you want to convert to grays.

1 mGy (milligrays) = 0.001 Gy (grays)

How to Convert Milligrays to Grays

The milligray and gray are both units of radiation dose. By definition, 1 gray equals exactly 1000 milligrays. This means to convert milligrays to grays, you divide by 1000.

Formula

grays = milligrays ÷ 1000

Step-by-Step Example

Convert 5 mGy to grays:

1
Convert 5 mGy to grays

We need to convert milligrays to grays

2
Apply the formula

Since 1 Gy = 1000 mGy, divide by 1000

5 ÷ 1000 = 0.005

Answer

5 mGy = 0.005 Gy

Milligray to Gray Conversion Table

Quick reference table for common milligray to gray conversions. Click any value for detailed calculation.

Milligrays (mGy) Grays (Gy)
0.1 mGy 0.0001 Gy
0.5 mGy 0.0005 Gy
1 mGy 0.001 Gy
2 mGy 0.002 Gy
5 mGy 0.005 Gy
10 mGy 0.01 Gy
25 mGy 0.025 Gy
50 mGy 0.05 Gy
100 mGy 0.1 Gy

About These Units

Milligray (mGy)

A milligray (mGy) equals 0.001 gray or 0.1 rad. Common medical imaging doses: CT scan 10-30 mGy, mammogram 2-3 mGy, fluoroscopy 20-50 mGy. Diagnostic reference levels often specified in mGy.

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 milligrays to grays?

To convert milligrays to grays, divide the value by 1000. For example, 10 mGy = 0.01 Gy.

How many grays are in 1 milligray?

1 milligray equals 0.001 grays.

What is the formula for milligrays to grays?

The formula is: Gy = mGy ÷ 1000.