Grays: conversions & definition
Grays (Gy) represent absorbed dose units. One unit equals 10^0 Gy. One gray is one joule of energy imparted per kilogram of matter.
Choose the unit you need
Each row converts one Gy. Open a converter to enter any value and see its formula, worked example and reference table. Results below are rounded to 10 significant digits.
| Convert to | Equivalent value | Calculator |
|---|---|---|
| Attograys (aGy) | ≈ 1e+18 | Convert Gy to aGy |
| Centigrays (cGy) | ≈ 100 | Convert Gy to cGy |
| Decagrays (daGy) | ≈ 0.1 | Convert Gy to daGy |
| Decigrays (dGy) | ≈ 10 | Convert Gy to dGy |
| Exagrays (EGy) | ≈ 1e-18 | Convert Gy to EGy |
| Femtograys (fGy) | ≈ 1e+15 | Convert Gy to fGy |
| Gigagrays (GGy) | ≈ 1e-9 | Convert Gy to GGy |
| Hectograys (hGy) | ≈ 0.01 | Convert Gy to hGy |
| Kilograys (kGy) | ≈ 0.001 | Convert Gy to kGy |
| Megagrays (MGy) | ≈ 0.000001 | Convert Gy to MGy |
| Micrograys (µGy) | ≈ 1,000,000 | Convert Gy to µGy |
| Milligrays (mGy) | ≈ 1,000 | Convert Gy to mGy |
| Nanograys (nGy) | ≈ 1,000,000,000 | Convert Gy to nGy |
| Petagrays (PGy) | ≈ 1e-15 | Convert Gy to PGy |
| Picograys (pGy) | ≈ 1e+12 | Convert Gy to pGy |
| Quectograys (qGy) | ≈ 1e+30 | Convert Gy to qGy |
| Quettagrays (QGy) | ≈ 1e-30 | Convert Gy to QGy |
| Ronnagrays (RGy) | ≈ 1e-27 | Convert Gy to RGy |
| Rontograys (rGy) | ≈ 1e+27 | Convert Gy to rGy |
| Teragrays (TGy) | ≈ 1e-12 | Convert Gy to TGy |
| Yoctograys (yGy) | ≈ 1e+24 | Convert Gy to yGy |
| Yottagrays (YGy) | ≈ 1e-24 | Convert Gy to YGy |
| Zeptograys (zGy) | ≈ 1e+21 | Convert Gy to zGy |
| Zettagrays (ZGy) | ≈ 1e-21 | Convert Gy to ZGy |
Keep the quantity consistent
Choose units that represent the same quantity and preserve the measurement conditions. A scale conversion changes the number and unit together; it does not change the physical amount or improve the accuracy of your measurement.
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