Quectogray is 1e-30 gray units.
Quectograys to Nanograys Converter — qGy to nGy
Convert Quectogray (qGy) to Nanogray (nGy) using the exact conversion factor (1 quectogray = 1e-21 nanogray). See the formula, worked examples, and conversion table.
Quectograys to Nanograys 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.
Nanogray is 1e-9 gray units.
Result = input x 1e-30 / 1e-9.
Absorbed Dose units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Quectograys to Nanograys
Quectogray and Nanogray 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: Quectogray is 1e-30 gray units, and nanogray is 1e-9 gray units.
Formula
nanograys = quectograys × 1e-21
This factor comes from each unit's defined relationship to the category's base unit: 1 quectogray equals 1e-30 base units, and 1 nanogray equals 1e-9 base units, so dividing one by the other gives the direct quectogray-to-nanogray factor of 1e-21.
Simple example
1 qGy × 1e-21 = 1e-21 nGy
1 quectogray = 1e-21 nanograys.
Real-world example
10 qGy × 1e-21 = 1e-20 nGy
10 quectograys = 1e-20 nanograys.
Conversion table
| Quectogray (qGy) | Nanogray (nGy) |
|---|---|
| 0.001 qGy | 1e-24 nGy |
| 0.01 qGy | 1e-23 nGy |
| 0.1 qGy | 1e-22 nGy |
| 1 qGy | 1e-21 nGy |
| 10 qGy | 1e-20 nGy |
| 100 qGy | 1e-19 nGy |
Reverse conversion: Nanogray to Quectogray
1e-21 nGy × 1e+21 = 1 qGy
1e-21 nanograys = 1 quectograys.
quectograys = nanograys × 1e+21
For a page dedicated to this direction, see Nanogray to Quectogray.
Understanding the Quectogray (qGy)
Quectogray is 1e-30 gray units.
Understanding the Nanogray (nGy)
Nanogray is 1e-9 gray units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many nanograys are in 1 quectogray?
1 quectogray equals 1e-21 nanograys, using the exact defined conversion factor rather than an estimate.
How do I convert quectogray to nanogray?
Multiply the quectogray value by 1e-21. The converter above does this instantly to whatever precision you set.
How do I convert nanogray back to quectogray?
Use the reverse factor: 1 nanogray equals 1e+21 quectograys. You can also use the swap control in the converter above to flip the direction instantly.
What is a quectogray?
Quectogray (qGy) is a unit of radiation.
What is a nanogray?
Nanogray (nGy) is a unit of radiation.
Is the quectogray to nanogray conversion exact?
Yes. Both quectogray and nanogray 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.