Gigagray is 1000000000 gray units.
Gigagrays to Megagrays Converter — GGy to MGy
Convert Gigagray (GGy) to Megagray (MGy) using the exact conversion factor (1 gigagray = 1,000 megagray). See the formula, worked examples, and conversion table.
Gigagrays to Megagrays 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.
Megagray is 1000000 gray units.
Result = input x 1e+9 / 1e+6.
Absorbed Dose units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Gigagrays to Megagrays
Gigagray and Megagray 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: Gigagray is 1000000000 gray units, and megagray is 1000000 gray units.
Formula
megagrays = gigagrays × 1000
This factor comes from each unit's defined relationship to the category's base unit: 1 gigagray equals 1000000000 base units, and 1 megagray equals 1000000 base units, so dividing one by the other gives the direct gigagray-to-megagray factor of 1000.
Simple example
1 GGy × 1000 = 1,000 MGy
1 gigagray = 1,000 megagrays.
Real-world example
10 GGy × 1000 = 10,000 MGy
10 gigagrays = 10,000 megagrays.
Conversion table
| Gigagray (GGy) | Megagray (MGy) |
|---|---|
| 0.001 GGy | 1 MGy |
| 0.01 GGy | 10 MGy |
| 0.1 GGy | 100 MGy |
| 1 GGy | 1,000 MGy |
| 10 GGy | 10,000 MGy |
| 100 GGy | 100,000 MGy |
Reverse conversion: Megagray to Gigagray
1 MGy × 0.001 = 0.001 GGy
1 megagray = 0.001 gigagrays.
gigagrays = megagrays × 0.001
For a page dedicated to this direction, see Megagray to Gigagray.
Understanding the Gigagray (GGy)
Gigagray is 1000000000 gray units.
Understanding the Megagray (MGy)
Megagray is 1000000 gray units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many megagrays are in 1 gigagray?
1 gigagray equals 1,000 megagrays, using the exact defined conversion factor rather than an estimate.
How do I convert gigagray to megagray?
Multiply the gigagray value by 1000. The converter above does this instantly to whatever precision you set.
How do I convert megagray back to gigagray?
Use the reverse factor: 1 megagray equals 0.001 gigagrays. You can also use the swap control in the converter above to flip the direction instantly.
What is a gigagray?
Gigagray (GGy) is a unit of radiation.
What is a megagray?
Megagray (MGy) is a unit of radiation.
Is the gigagray to megagray conversion exact?
Yes. Both gigagray and megagray are defined by fixed standards rather than physical artifacts, so the factor of 1000 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.