Convert Milligray to Roentgen
Enter the number of milligrays that you want to convert to roentgens.
How to Convert Milligrays to Roentgens
The milligray and roentgen are both units of radiation dose. 1 roentgen equals 8.77 milligrays. This means to convert milligrays to roentgens, you divide by 8.77.
Formula
Step-by-Step Example
Convert 5 mGy to roentgens:
We need to convert milligrays to roentgens
Since 1 R = 8.77 mGy, divide by 8.77
5 ÷ 8.77 = 0.5701254276
5 mGy = 0.5701254276 R
Milligray to Roentgen Conversion Table
Quick reference table for common milligray to roentgen conversions. Click any value for detailed calculation.
| Milligrays (mGy) | Roentgens (R) |
|---|---|
| 1 mGy | 0.1140250855 R |
| 2 mGy | 0.228050171 R |
| 5 mGy | 0.5701254276 R |
| 10 mGy | 1.1402508552 R |
| 15 mGy | 1.7103762828 R |
| 20 mGy | 2.2805017104 R |
| 25 mGy | 2.850627138 R |
| 50 mGy | 5.7012542759 R |
| 100 mGy | 11.402508552 R |
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.
Roentgen (R)
The roentgen (R) measures ionization produced by X-rays or gamma rays in air. One roentgen produces 2.58×10⁻⁴ C/kg of ionization. Approximately: 1 R ≈ 8.77 mGy or 0.877 rad in soft tissue. Named after Wilhelm Röntgen, discoverer of X-rays.
Frequently Asked Questions
How do I convert milligrays to roentgens?
To convert milligrays to roentgens, divide the value by 8.77. For example, 10 mGy = 1.1402508552 R.
How many roentgens are in 1 milligray?
1 milligray equals 0.1140250855 roentgens.
What is the formula for milligrays to roentgens?
The formula is: R = mGy ÷ 8.77.