Milligray is 0.001 gray units.
Milligrays to Yoctograys Converter — mGy to yGy
Convert Milligray (mGy) to Yoctogray (yGy) using the exact conversion factor (1 milligray = 1e+21 yoctogray). See the formula, worked examples, and conversion table.
Milligrays to Yoctograys 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.
Yoctogray is 1e-24 gray units.
Result = input x 0.001 / 1e-24.
Absorbed Dose units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Milligrays to Yoctograys
Milligray and Yoctogray 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: Milligray is 0.001 gray units, and yoctogray is 1e-24 gray units.
Formula
yoctograys = milligrays × 1e+21
This factor comes from each unit's defined relationship to the category's base unit: 1 milligray equals 0.001 base units, and 1 yoctogray equals 1e-24 base units, so dividing one by the other gives the direct milligray-to-yoctogray factor of 1e+21.
Simple example
1 mGy × 1e+21 = 1e+21 yGy
1 milligray = 1e+21 yoctograys.
Real-world example
10 mGy × 1e+21 = 1e+22 yGy
10 milligrays = 1e+22 yoctograys.
Conversion table
| Milligray (mGy) | Yoctogray (yGy) |
|---|---|
| 0.001 mGy | 1e+18 yGy |
| 0.01 mGy | 1e+19 yGy |
| 0.1 mGy | 1e+20 yGy |
| 1 mGy | 1e+21 yGy |
| 10 mGy | 1e+22 yGy |
| 100 mGy | 1e+23 yGy |
Reverse conversion: Yoctogray to Milligray
1e+21 yGy × 1e-21 = 1 mGy
1e+21 yoctograys = 1 milligray.
milligrays = yoctograys × 1e-21
For a page dedicated to this direction, see Yoctogray to Milligray.
Understanding the Milligray (mGy)
Milligray is 0.001 gray units.
Understanding the Yoctogray (yGy)
Yoctogray is 1e-24 gray units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many yoctograys are in 1 milligray?
1 milligray equals 1e+21 yoctograys, using the exact defined conversion factor rather than an estimate.
How do I convert milligray to yoctogray?
Multiply the milligray value by 1e+21. The converter above does this instantly to whatever precision you set.
How do I convert yoctogray back to milligray?
Use the reverse factor: 1 yoctogray equals 1e-21 milligrays. You can also use the swap control in the converter above to flip the direction instantly.
What is a milligray?
Milligray (mGy) is a unit of radiation.
What is a yoctogray?
Yoctogray (yGy) is a unit of radiation.
Is the milligray to yoctogray conversion exact?
Yes. Both milligray and yoctogray are defined by fixed standards rather than physical artifacts, so the factor of 1e+21 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.