Grays to Centigrays Converter
Enter the absorbed radiation dose in grays below to convert it to centigrays.
Convert Grays to Centigrays
Enter a value in grays (Gy) to convert to centigrays (cGy).
Gray to Centigray Conversion Table
Table showing various gray measurements converted to centigrays. Click any preset value or arrow to load it into the converter.
How to Convert Grays to Centigrays
To convert grays to centigrays, multiply the absorbed radiation dose by the following conversion ratio: 100 centigrays/gray.
Since one gray is equal to 100 centigrays, you can use this simple formula to convert:
The absorbed radiation dose in centigrays is equal to the absorbed radiation dose in grays multiplied by 100.
For example, here's how to convert 10 grays to centigrays using the formula above.
How Many Centigrays Are in a Gray?
There are 100 centigrays in a gray, which is why we use this value in the formula above.
Our gray to centigray calculator automatically converts your absorbed radiation dose measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
Grays and centigrays are both units used to measure absorbed radiation dose. Keep reading to learn more about each unit.
What Is a Gray?
SI derived unit of absorbed radiation dose (1 Gy = 1 J/kg = 100 rad). It serves as a primary reference unit for measuring absorbed radiation dose across scientific and practical applications. [1]
The gray is classified as an International System of Units (SI) unit of absorbed radiation dose. Grays can be abbreviated as Gy; for example, 1 gray can be written as 1 Gy.
As the primary coherent reference unit for absorbed radiation dose in this category, all other absorbed radiation dose units are mathematically anchored to the gray (Gy).
In practice, grays (Gy) are widely used across standard absorbed radiation dose applications within International System of Units (SI) workflows, engineering documentation, and technical data sheets.
What Is a Centigray?
A centigray is a unit of absorbed radiation dose equal to 1/100 of a gray (0.01 Gy). Radiotherapy dose unit numerically equal to 1 rad (0.01 Gy). [2]
The centigray is classified as a metric and SI-compatible unit of absorbed radiation dose. Centigrays can be abbreviated as cGy; for example, 1 centigray can be written as 1 cGy.
In the metric system, "centi" is the standard SI prefix for hundredths, or 10⁻². This makes the centigray (cGy) a convenient decimal multiple of the gray (Gy).
In practice, centigrays (cGy) are widely used across fine-tolerance laboratory, analytical, and micro-scale absorbed radiation dose measurements within SI metric workflows, engineering documentation, and technical data sheets.
When converting absorbed radiation dose between grays (Gy) and centigrays (cGy), keep full floating-point precision (1 Gy = 100 cGy; 1 cGy = 0.01 Gy) during intermediate calculations and round only the final centigray figure to match your instrument tolerance.
More Gray & Centigray Conversions
Need to calculate in the opposite direction? Use our centigrays to grays converter (cGy to Gy) to switch your starting unit immediately. You can also explore related tools such as converting grays to milligrays, converting grays to micrograys, or converting milligrays to grays.
Frequently Asked Questions
References
- [1]NIST OWM StandardNIST OWM (SI Units — Length)·Radiation-Absorbed Dose Metrology Standard — Grays (Gy) to Centigrays (cGy)
- [2]BIPM SpecificationBIPM (SI Base Unit: Metre (m))·Unit Specifications: Gray (Gy) & Centigray (cGy)
- [3]NIST HB 133 ReferenceNIST HB 133 (NIST Handbook 133 (2019 Ed.))·Conversion Factors & Mathematical Basis (Gy to cGy)