Attogray is 1e-18 gray units.
Attograys to Milligrays Converter — aGy to mGy
Convert Attogray (aGy) to Milligray (mGy) using the exact conversion factor (1 attogray = 1e-15 milligray). See the formula, worked examples, and conversion table.
Attograys to Milligrays 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.
Milligray is 0.001 gray units.
Result = input x 1e-18 / 0.001.
Absorbed Dose units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Attograys to Milligrays
Attogray and Milligray 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: Attogray is 1e-18 gray units, and milligray is 0.001 gray units.
Formula
milligrays = attograys × 1e-15
This factor comes from each unit's defined relationship to the category's base unit: 1 attogray equals 1e-18 base units, and 1 milligray equals 0.001 base units, so dividing one by the other gives the direct attogray-to-milligray factor of 1e-15.
Simple example
1 aGy × 1e-15 = 1e-15 mGy
1 attogray = 1e-15 milligrays.
Real-world example
10 aGy × 1e-15 = 1e-14 mGy
10 attograys = 1e-14 milligrays.
Conversion table
| Attogray (aGy) | Milligray (mGy) |
|---|---|
| 0.001 aGy | 1e-18 mGy |
| 0.01 aGy | 1e-17 mGy |
| 0.1 aGy | 1e-16 mGy |
| 1 aGy | 1e-15 mGy |
| 10 aGy | 1e-14 mGy |
| 100 aGy | 1e-13 mGy |
Reverse conversion: Milligray to Attogray
1e-15 mGy × 1e+15 = 1 aGy
1e-15 milligrays = 1 attogray.
attograys = milligrays × 1e+15
For a page dedicated to this direction, see Milligray to Attogray.
Understanding the Attogray (aGy)
Attogray is 1e-18 gray units.
Understanding the Milligray (mGy)
Milligray is 0.001 gray units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many milligrays are in 1 attogray?
1 attogray equals 1e-15 milligrays, using the exact defined conversion factor rather than an estimate.
How do I convert attogray to milligray?
Multiply the attogray value by 1e-15. The converter above does this instantly to whatever precision you set.
How do I convert milligray back to attogray?
Use the reverse factor: 1 milligray equals 1e+15 attograys. You can also use the swap control in the converter above to flip the direction instantly.
What is a attogray?
Attogray (aGy) is a unit of radiation.
What is a milligray?
Milligray (mGy) is a unit of radiation.
Is the attogray to milligray conversion exact?
Yes. Both attogray and milligray are defined by fixed standards rather than physical artifacts, so the factor of 1e-15 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.