Milliroentgens to Roentgens Converter (mR to R)

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Convert Milliroentgens (mR) to Roentgens (R) instantly. Divide milliroentgens by 1,000 to translate survey meter readouts and dosimeter measurements into standard roentgens.

How to Use This Converter

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

Milliroentgens (mR) to Roentgens (R) Formula

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

Primary Formula:
R = mR / 1,000 (or R = mR × 0.001)

Calculation Examples

Example 1: 1,000 mR = 1 R
Example 2: 500 mR = 0.5 R
Example 3: 100 mR = 0.1 R
Example 4: 10 mR = 0.01 R

Milliroentgens (mR) to Roentgens (R) Conversion Table

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

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.

Milliroentgens to Roentgens Converter (mR to R)