Convert Rads to Millirads
Convert Rads (rad) to Millirads (mrad) instantly and accurately.
Conversion Formula
mrad = rad × 1000
About Rads
The rad (rad) equals exactly 0.01 Gy = 100 erg/g. The pre-SI unit of absorbed dose, defined by the ICRU in 1953, still widely used in the US in radiation therapy (cGy = rad numerically), radiation biology, and NRC regulations. Whole-body 50% lethal dose (LD50) for humans ~350-450 rad. 1 rad = 0.01 Gy = 1 cGy.
About Millirads
The millirad (mrad) equals 10⁻³ rad = 10⁻⁵ Gy = 10 µGy. Older US health physics reports and NRC licence conditions quote occupational extremity doses in mrad; some film badge dosimetry reports still use mrad for historical continuity. 1 mrad = 10⁻³ rad = 10⁻⁵ Gy = 10 µGy.
Quick Reference Table
| Rads (rad) | Millirads (mrad) |
|---|---|
| 1 rad | 1000 mrad |
| 2 rad | 2000 mrad |
| 5 rad | 5000 mrad |
| 10 rad | 10000 mrad |
| 25 rad | 25000 mrad |
| 50 rad | 50000 mrad |
| 100 rad | 100000 mrad |