Rontogray is 1e-27 gray units.
Rontograys to Zeptograys Converter — rGy to zGy
Convert Rontogray (rGy) to Zeptogray (zGy) using the exact conversion factor (1 rontogray = 0.000001 zeptogray). See the formula, worked examples, and conversion table.
Rontograys to Zeptograys 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.
Zeptogray is 1e-21 gray units.
Result = input x 1e-27 / 1e-21.
Absorbed Dose units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Rontograys to Zeptograys
Rontogray and Zeptogray 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: Rontogray is 1e-27 gray units, and zeptogray is 1e-21 gray units.
Formula
zeptograys = rontograys × 0.000001
This factor comes from each unit's defined relationship to the category's base unit: 1 rontogray equals 1e-27 base units, and 1 zeptogray equals 1e-21 base units, so dividing one by the other gives the direct rontogray-to-zeptogray factor of 0.000001.
Simple example
1 rGy × 0.000001 = 0.000001 zGy
1 rontogray = 0.000001 zeptograys.
Real-world example
10 rGy × 0.000001 = 0.00001 zGy
10 rontograys = 0.00001 zeptograys.
Conversion table
| Rontogray (rGy) | Zeptogray (zGy) |
|---|---|
| 0.001 rGy | 1e-9 zGy |
| 0.01 rGy | 1e-8 zGy |
| 0.1 rGy | 1e-7 zGy |
| 1 rGy | 0.000001 zGy |
| 10 rGy | 0.00001 zGy |
| 100 rGy | 0.0001 zGy |
Reverse conversion: Zeptogray to Rontogray
0.000001 zGy × 1000000 = 1 rGy
0.000001 zeptograys = 1 rontograys.
rontograys = zeptograys × 1000000
For a page dedicated to this direction, see Zeptogray to Rontogray.
Understanding the Rontogray (rGy)
Rontogray is 1e-27 gray units.
Understanding the Zeptogray (zGy)
Zeptogray is 1e-21 gray units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many zeptograys are in 1 rontogray?
1 rontogray equals 0.000001 zeptograys, using the exact defined conversion factor rather than an estimate.
How do I convert rontogray to zeptogray?
Multiply the rontogray value by 0.000001. The converter above does this instantly to whatever precision you set.
How do I convert zeptogray back to rontogray?
Use the reverse factor: 1 zeptogray equals 1,000,000 rontograys. You can also use the swap control in the converter above to flip the direction instantly.
What is a rontogray?
Rontogray (rGy) is a unit of radiation.
What is a zeptogray?
Zeptogray (zGy) is a unit of radiation.
Is the rontogray to zeptogray conversion exact?
Yes. Both rontogray and zeptogray are defined by fixed standards rather than physical artifacts, so the factor of 0.000001 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.