Convert milliroentgens to roentgens
1 mR = 0.001 R — exactly. Both units are defined against the SI, so this factor is a fraction, not an approximation.
0.001R
As a fraction: 1/1000
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1 mR = 0.001 R
Show this value in all 5 radiation exposure units
- Coulomb per kilograms C/kg 0.000 000 258
- Millicoulomb per kilograms mC/kg 0.000 258
- Roentgens R 0.001
- Milliroentgens mR 1
- Microroentgens µR 1000
Every row is Milliroentgen (mR) converted through the coulomb per kilogram, in exact rational arithmetic.
How to convert milliroentgens to roentgens
Multiply the number of milliroentgens by 0.001 to get roentgens.
The exact factor is 0.001 — as a fraction, 1/1000.
Roentgen: Exactly 2.58 × 10⁻⁴ C/kg by definition.
Milliroentgen to Roentgen conversion table
| Milliroentgens (mR) | Roentgens (R) |
|---|---|
| 1 mR | 0.001 |
| 2 mR | 0.002 |
| 3 mR | 0.003 |
| 5 mR | 0.005 |
| 10 mR | 0.01 |
| 20 mR | 0.02 |
| 25 mR | 0.025 |
| 50 mR | 0.05 |
| 100 mR | 0.1 |
| 250 mR | 0.25 |
| 500 mR | 0.5 |
| 1000 mR | 1 |
Roentgen to Milliroentgen conversion table
| Roentgens (R) | Milliroentgens (mR) |
|---|---|
| 1 R | 1000 |
| 2 R | 2000 |
| 3 R | 3000 |
| 5 R | 5000 |
| 10 R | 10 000 |
| 20 R | 20 000 |
| 25 R | 25 000 |
| 50 R | 50 000 |
| 100 R | 100 000 |
| 250 R | 250 000 |
| 500 R | 500 000 |
| 1000 R | 1 000 000 |
Frequently asked
How many roentgens are in a milliroentgen?
One milliroentgen equals 0.001 roentgens (mR → R). That figure is exact, not rounded.
How do you convert milliroentgens to roentgens?
Multiply the number of milliroentgens by 0.001 to get roentgens.
What is 1 R in milliroentgens?
One roentgen is 1000 milliroentgens.
What is 10 mR in R?
10 mR = 0.01 R.
What exactly is a roentgen?
Exactly 2.58 × 10⁻⁴ C/kg by definition.