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Radiation-Absorbed Dose Converter

Enter a value below to convert between metric, imperial, and standard radiation-absorbed dose units.

Convert Radiation-Absorbed Dose

Enter a value and select the units to convert between grays, centigrays, and milligrays.

Instant conversion
Result
1,000 cGy
10 Gy = 1,000 cGy
10 Gy = 1,000 cGy = 10,000 mGyGet Widget

You can change the units using the dropdowns above or click on a unit button.

Suggested Conversions

Common Radiation-Absorbed Dose Reference Points

Here are some common radiation-absorbed dose values in Gray (Gy), Centigray (cGy), and Milligray (mGy). Click any preset value or arrow to load it into the converter.

DescriptionGray (Gy)Centigray (cGy)Milligray (mGy)
1 gray unit11001,000
5 grays55005,000
10 grays benchmark101,00010,000
25 grays252,50025,000
50 grays505,00050,000
100 grays reference10010,000100,000

Radiation-Absorbed Dose Conversion Formulas

Use the following formulas to convert between grays, centigrays, and milligrays.

Grays to Centigrays
cGy = Gy × 100
Centigrays to Grays
Gy = cGy × 0.01
Grays to Milligrays
mGy = Gy × 1,000
Example: Convert 10 Grays (Gy) to Centigrays (cGy)
1 Gy = 100 cGy
10 Gy × 100 = 1,000 cGy

All radiation-absorbed dose conversions are anchored to the international SI base unit (Gray) for full scientific and engineering accuracy.

More Gray & Centigray Conversions

Convert from Grays

Convert to Centigrays

Frequently Asked Questions

1 gray (Gy) equals 100 centigrays (cGy). Multiply your gray value by 100 or enter it in the Radiation-Absorbed Dose Converter above for instant calculation.

All Radiation-Absorbed Dose Conversion Calculators (6)

Select any dedicated radiation-absorbed dose pair below for worked examples and printable tables

Grays to Centigrays (Gy to cGy)Centigrays to Grays (cGy to Gy)Grays to Milligrays (Gy to mGy)Milligrays to Grays (mGy to Gy)Grays to Micrograys (Gy to µGy)Micrograys to Grays (µGy to Gy)

Category Conversion Matrix

Simultaneous comparison of 6 units in this category

Gray (Gy)
1
Centigray (cGy)
100
Milligray (mGy)
1,000
Microgray (µGy)
1,000,000
Rad (Radiation Absorbed Dose) (rad)
100
Millirad (mrad)
100,000

Radiation-Absorbed Dose Unit Definitions & Symbols

Gray (Gy)

SI

SI derived unit of absorbed radiation dose (1 Gy = 1 J/kg = 100 rad).

Centigray (cGy)

METRIC

Radiotherapy dose unit numerically equal to 1 rad (0.01 Gy).

Milligray (mGy)

METRIC

CT scan & diagnostic radiography absorbed dose unit (0.001 Gy).

Microgray (µGy)

METRIC

Equal to 10⁻⁶ Gray.

Rad (Radiation Absorbed Dose) (rad)

OTHER

CGS absorbed dose unit equal to 100 erg/g or 0.01 Gray (1 cGy).

Millirad (mrad)

OTHER

One-thousandth of a rad (10 µGy).

References

NIST · BIPM · ISO
  1. [1]
    NIST (NIST HB 133 / SP 811)·Checking the Net Contents of Packaged Goods, Handbook 133 - 2019 Edition & NIST SP 811
    NIST HB 133 Standard
  2. [2]
    BIPM (BIPM SI-9)·The International System of Units (SI Brochure, 9th Edition)
    BIPM SI Brochure
  3. [3]
    NIST SP 811 (NIST SP 811 App. B.9)·NIST Guide to the SI, Appendix B.9: Factors for Units Listed by Kind of Quantity or Field of Science
    NIST SP 811 Appendix B.9
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