Convert Grays to Micrograys (Gy to µGy)
1 gray (Gy) = 1000000 micrograys (µGy). 1 µGy = 0.000001 Gy. Example: 15 Gy = 15 × 1000000 = 15000000 µGy.
Also searched as grays to µGy, grays in µGy, grays into micrograys, Gy to µGy, Gy in micrograys, Gy into microgray, gray to microgray, Gy to micrograys converter and how many micrograys in a gray.
1 Gy = 1000000 µGy
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk gray to microgray converter to paste a column from Excel.
How to Convert Gray to Microgray
- 1 Gy = 1000000 µGy
- 1 µGy = 0.000001 Gy
- Example: convert 15 Gy to µGy: 15 Gy = 15 × 1000000 µGy = 15000000 µGy
Formula
µGy = Gy × 1000000
Derivation from SI units:
- 1 Gy = 1 J of absorbed energy per kg.
- 1 µGy = 10⁻⁶ Gy.
Both units are defined exactly, so the factor is exact. Gray definition: gray; Microgray definition: microgray.
Worked examples
- A reading of 0.5 Gy converts to 500000 µGy.
0.5 Gy × 1000000 = 500000 µGy - A value of 5 Gy is 5000000 µGy.
5 Gy × 1000000 = 5000000 µGy
Gray to Microgray conversion table
| Grays (Gy) | Micrograys (µGy) |
|---|---|
| 0.001 Gy | 1000 µGy |
| 0.01 Gy | 10000 µGy |
| 0.1 Gy | 100000 µGy |
| 0.5 Gy | 500000 µGy |
| 1 Gy | 1000000 µGy |
| 2 Gy | 2000000 µGy |
| 5 Gy | 5000000 µGy |
| 10 Gy | 10000000 µGy |
| 50 Gy | 50000000 µGy |
| 100 Gy | 100000000 µGy |
Where it's used
Grays are used for radiotherapy prescriptions, while micrograys appear in dental and chest X-ray air kerma. Both measure absorbed dose of ionising radiation, so the conversion is a fixed factor.
Gray to other absorbed dose units
| Conversion | 1 Gy equals |
|---|---|
| gray to microgray | 1000000 µGy |
| gray to milligray | 1000 mGy |
| gray to rad | 100 rad |
| gray to centigray | 100 cGy |
| gray to kilogray | 0.001 kGy |
| gray to millirad | 100000 mrad |
Frequently asked questions
How many micrograys are in 1 gray?
1 Gy = 1000000 µGy.
How do I convert grays to micrograys?
Multiply the value in Gy by 1000000. For example, 15 Gy × 1000000 = 15000000 µGy.
Is the Gy to µGy conversion exact?
Yes. Both units are defined exactly, and 1 Gy is exactly 1000000 µGy.
Sources
- The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 4 (becquerel, gray, sievert, lux) and Table 2 (candela).
Last reviewed: . Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.
Cite this page
APA
Scientific Converters. (2026, October 15). Convert Grays to Micrograys (Gy to µGy). Retrieved October 25, 2026, from https://scientificconverters.com/absorbed-dose/grays-to-micrograys/
IEEE
Scientific Converters, "Convert Grays to Micrograys (Gy to µGy)," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/absorbed-dose/grays-to-micrograys/