Megagray is 1000000 gray units.
Megagrays to Gigagrays Converter — MGy to GGy
Convert Megagray (MGy) to Gigagray (GGy) using the exact conversion factor (1 megagray = 0.001 gigagray). See the formula, worked examples, and conversion table.
Megagrays to Gigagrays 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.
Gigagray is 1000000000 gray units.
Result = input x 1e+6 / 1e+9.
Absorbed Dose units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Megagrays to Gigagrays
Megagray and Gigagray 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: Megagray is 1000000 gray units, and gigagray is 1000000000 gray units.
Formula
gigagrays = megagrays × 0.001
This factor comes from each unit's defined relationship to the category's base unit: 1 megagray equals 1000000 base units, and 1 gigagray equals 1000000000 base units, so dividing one by the other gives the direct megagray-to-gigagray factor of 0.001.
Simple example
1 MGy × 0.001 = 0.001 GGy
1 megagray = 0.001 gigagrays.
Real-world example
10 MGy × 0.001 = 0.01 GGy
10 megagrays = 0.01 gigagrays.
Conversion table
| Megagray (MGy) | Gigagray (GGy) |
|---|---|
| 0.001 MGy | 0.000001 GGy |
| 0.01 MGy | 0.00001 GGy |
| 0.1 MGy | 0.0001 GGy |
| 1 MGy | 0.001 GGy |
| 10 MGy | 0.01 GGy |
| 100 MGy | 0.1 GGy |
Reverse conversion: Gigagray to Megagray
0.001 GGy × 1000 = 1 MGy
0.001 gigagrays = 1 megagray.
megagrays = gigagrays × 1000
For a page dedicated to this direction, see Gigagray to Megagray.
Understanding the Megagray (MGy)
Megagray is 1000000 gray units.
Understanding the Gigagray (GGy)
Gigagray is 1000000000 gray units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many gigagrays are in 1 megagray?
1 megagray equals 0.001 gigagrays, using the exact defined conversion factor rather than an estimate.
How do I convert megagray to gigagray?
Multiply the megagray value by 0.001. The converter above does this instantly to whatever precision you set.
How do I convert gigagray back to megagray?
Use the reverse factor: 1 gigagray equals 1,000 megagrays. You can also use the swap control in the converter above to flip the direction instantly.
What is a megagray?
Megagray (MGy) is a unit of radiation.
What is a gigagray?
Gigagray (GGy) is a unit of radiation.
Is the megagray to gigagray conversion exact?
Yes. Both megagray and gigagray are defined by fixed standards rather than physical artifacts, so the factor of 0.001 used above is exact to as many digits as you choose to display.
What's the difference between absorbed dose, equivalent dose, and activity?
Absorbed dose (gray, rad) measures the energy radiation deposits in matter. Equivalent dose (sievert, rem) adjusts that figure for how harmful different types of radiation are to biological tissue. Activity (becquerel, curie) measures how often a radioactive source decays, independent of how much dose a person actually receives from it.