Radiology: absorbed dose converter

1 rad = 0.01 Gy (exact)

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About radiology: absorbed dose conversions

Absorbed dose (gray) and equivalent dose (sievert) are different quantities and cannot be converted into each other without a radiation weighting factor.

Common radiology: absorbed dose conversions

Rad to gray

Radiology: absorbed dose units explained

Unit	System	Definition and notes
Gray (Gy)	SI (metric)	Base unitThe SI unit of absorbed radiation dose: 1 joule of energy per kilogram.
Milligray (mGy)	SI (metric)	1 mGy = 0.001 Gy (exact)
Centigray (cGy)	SI (metric)	1 cGy = 0.01 Gy (exact)
Rad (dose) (rad)	other	1 rad = 0.01 Gy (exact)An older unit of absorbed dose: exactly 0.01 Gy.

Rad to gray conversion table

rad (dose) (rad) to gray (Gy)
Rad (rad)	Gray (Gy)
0.1 rad	0.001 Gy
0.5 rad	0.005 Gy
1 rad	0.01 Gy
2 rad	0.02 Gy
3 rad	0.03 Gy
4 rad	0.04 Gy
5 rad	0.05 Gy
6 rad	0.06 Gy
7 rad	0.07 Gy
8 rad	0.08 Gy
9 rad	0.09 Gy
10 rad	0.1 Gy
15 rad	0.15 Gy
20 rad	0.2 Gy
25 rad	0.25 Gy
30 rad	0.3 Gy
40 rad	0.4 Gy
50 rad	0.5 Gy
75 rad	0.75 Gy
100 rad	1 Gy
250 rad	2.5 Gy
500 rad	5 Gy
1,000 rad	10 Gy

Frequently asked questions

Which radiology: absorbed dose units can I convert?

gray (Gy), milligray (mGy), centigray (cGy), rad (rad).

How accurate are the results?

Every unit is stored with its exact defining factor (NIST SP 811, NIST Handbook 44 or the BIPM SI Brochure). Calculations use double-precision arithmetic and are rounded only for display, to 5 significant figures by default (trailing zeros dropped, so 1 km shows as 1000 m). You can choose Auto (up to 10 digits), fixed decimals or more significant figures, or switch to scientific or engineering notation.

Radiology: absorbed dose converter