Centigray is 0.01 gray units.
Centigrays to Rads Converter — cGy to rad
Convert Centigray (cGy) to Rad (rad) using the exact conversion factor (1 centigray = 1 rad). See the formula, worked examples, conversion table, and common uses.
Centigrays to Rads converter
Converter
Radiation Converter
Convert radioactivity, absorbed dose, and equivalent dose units by compatible radiation family.
Context values
Some unit families need one extra value for a physically accurate result.
Rad is 0.01 gray.
Result = input x 0.01 / 0.01.
Absorbed Dose units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Centigrays to Rads
Centigray and Rad both belong to the radiation-measurement family, though radiation quantities fall into genuinely distinct categories: absorbed dose (gray, rad) measures energy deposited in matter, equivalent dose (sievert, rem) weights that for biological harm, and activity (becquerel, curie) measures how often a radioactive source decays — this page only converts between units of the same kind. Specifically: Centigray is 0.01 gray units, and rad is 0.01 gray.
Formula
rads = centigrays × 1
This factor comes from each unit's defined relationship to the category's base unit: 1 centigray equals 0.01 base units, and 1 rad equals 0.01 base units, so dividing one by the other gives the direct centigray-to-rad factor of 1.
Simple example
1 cGy × 1 = 1 rad
1 centigray = 1 rad.
Real-world example
10 cGy × 1 = 10 rad
10 centigrays = 10 rads.
Conversion table
| Centigray (cGy) | Rad (rad) |
|---|---|
| 0.001 cGy | 0.001 rad |
| 0.01 cGy | 0.01 rad |
| 0.1 cGy | 0.1 rad |
| 1 cGy | 1 rad |
| 10 cGy | 10 rad |
| 100 cGy | 100 rad |
Reverse conversion: Rad to Centigray
1 rad × 1 = 1 cGy
1 rad = 1 centigray.
centigrays = rads × 1
For a page dedicated to this direction, see Rad to Centigray.
Understanding the Centigray (cGy)
Centigray is 0.01 gray units.
Understanding the Rad
Rad (rad) measures absorbed radiation dose. 'Radiation absorbed dose' — the US customary unit of absorbed radiation dose, fixed at exactly 0.01 gray. It is classified as a non-SI unit, still common in the US.
Where it's used: Still used in some US medical and historical contexts alongside the SI gray
Rad vs. gray. Both measure absorbed radiation dose; the gray is the modern SI unit while the rad is the older US customary unit, related by 1 gray = 100 rad exactly.
Uses of the Rad today
- US radiation therapy dose records (historically)
- US nuclear regulatory and medical physics contexts
Rad — sources
- NIST Guide to the SI, Appendix B — Lists the rad among non-SI units with an exact SI equivalence.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many rads are in 1 centigray?
1 centigray equals 1 rad, using the exact defined conversion factor rather than an estimate.
How do I convert centigray to rad?
Multiply the centigray value by 1. The converter above does this instantly to whatever precision you set.
How do I convert rad back to centigray?
Use the reverse factor: 1 rad equals 1 centigray. You can also use the swap control in the converter above to flip the direction instantly.
What is a centigray?
Centigray (cGy) is a unit of radiation.
What is a rad?
Rad (rad) measures absorbed radiation dose. 'Radiation absorbed dose' — the US customary unit of absorbed radiation dose, fixed at exactly 0.01 gray. It is classified as a non-SI unit, still common in the US.
Is the centigray to rad conversion exact?
Yes. 'Radiation absorbed dose' — the US customary unit of absorbed radiation dose, fixed at exactly 0.01 gray. That fixed definition is what the converter above uses, so any rounding you see is a display choice, not a limitation of the math.
What is the difference between rad vs. gray?
Both measure absorbed radiation dose; the gray is the modern SI unit while the rad is the older US customary unit, related by 1 gray = 100 rad exactly.