Roentgens to Milliroentgens Converter (R to mR)

Value

From

Result

—

Convert Roentgens (R) to Milliroentgens (mR) accurately. One Roentgen equals exactly 1,000 Milliroentgens, providing an essential calculation tool for Geiger-Müller survey meters and environmental radiation monitoring.

How to Use This Converter

Enter the value in Roentgens (R) you want to convert.
Ensure the “From” selector is set to Roentgens (R).
Ensure the “To” selector is set to Milliroentgens (mR).
The converted radiation exposure in Milliroentgens (mR) calculates instantly in the result box.

Roentgens (R) to Milliroentgens (mR) Formula

To convert from Roentgens (R) to Milliroentgens (mR), use the exact metric prefix relationship:

Primary Formula:
mR = R × 1,000

Calculation Examples

Example 1: 1 R = 1,000 mR
Example 2: 0.1 R = 100 mR
Example 3: 0.05 R = 50 mR
Example 4: 10 R = 10,000 mR

Roentgens (R) to Milliroentgens (mR) Conversion Table

Roentgens (R)	Milliroentgens (mR)
0.001 R	1 mR
0.01 R	10 mR
0.05 R	50 mR
0.1 R	100 mR
0.5 R	500 mR
1 R	1,000 mR
5 R	5,000 mR
10 R	10,000 mR

Frequently Asked Questions

How many Milliroentgens are in 1 Roentgen?

Exactly 1,000 Milliroentgens. One Roentgen equals 1,000 Milliroentgens (1 R = 10³ mR). Conversely, 1 Milliroentgen equals 0.001 Roentgens (1 mR = 10⁻³ R).

What is the difference between Radiation Exposure and Absorbed Dose?

Radiation exposure (measured in Roentgens or C/kg) measures the total ionization charge produced in a volume of dry air by photons. Absorbed dose (measured in Grays or rads) measures the physical energy deposited in any material or tissue mass (1 Gy = 1 J/kg).

Why is the Roentgen restricted to photons in air?

By international radiological definition, the Roentgen applies strictly to X-rays and gamma rays ionizing dry air. It is not defined for particulate radiation (such as alpha, beta, or neutron particles) or for non-air absorbing materials.

Roentgens to Milliroentgens Converter (R to mR)