Petagray is 1000000000000000 gray units.
Petagrays to Rads Converter — PGy to rad
Convert Petagray (PGy) to Rad (rad) using the exact conversion factor (1 petagray = 1e+17 rad). See the formula, worked examples, conversion table, and common uses.
Petagrays to Rads 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.
Rad is 0.01 gray.
Result = input x 1e+15 / 0.01.
Absorbed Dose units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Petagrays to Rads
Petagray and Rad 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: Petagray is 1000000000000000 gray units, and rad is 0.01 gray.
Formula
rads = petagrays × 1e+17
This factor comes from each unit's defined relationship to the category's base unit: 1 petagray equals 1e+15 base units, and 1 rad equals 0.01 base units, so dividing one by the other gives the direct petagray-to-rad factor of 1e+17.
Simple example
1 PGy × 1e+17 = 1e+17 rad
1 petagray = 1e+17 rads.
Real-world example
10 PGy × 1e+17 = 1e+18 rad
10 petagrays = 1e+18 rads.
Conversion table
| Petagray (PGy) | Rad (rad) |
|---|---|
| 0.001 PGy | 1e+14 rad |
| 0.01 PGy | 1e+15 rad |
| 0.1 PGy | 1e+16 rad |
| 1 PGy | 1e+17 rad |
| 10 PGy | 1e+18 rad |
| 100 PGy | 1e+19 rad |
Reverse conversion: Rad to Petagray
1e+17 rad × 1e-17 = 1 PGy
1e+17 rads = 1 petagray.
petagrays = rads × 1e-17
For a page dedicated to this direction, see Rad to Petagray.
Understanding the Petagray (PGy)
Petagray is 1000000000000000 gray units.
Understanding the Rad
Rad (rad) measures absorbed radiation dose. 'Radiation absorbed dose' — the US customary unit of absorbed radiation dose, fixed at exactly 0.01 gray. It is classified as a non-SI unit, still common in the US.
Where it's used: Still used in some US medical and historical contexts alongside the SI gray
Rad vs. gray. Both measure absorbed radiation dose; the gray is the modern SI unit while the rad is the older US customary unit, related by 1 gray = 100 rad exactly.
Uses of the Rad today
- US radiation therapy dose records (historically)
- US nuclear regulatory and medical physics contexts
Rad — sources
- NIST Guide to the SI, Appendix B — Lists the rad among non-SI units with an exact SI equivalence.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many rads are in 1 petagray?
1 petagray equals 1e+17 rads, using the exact defined conversion factor rather than an estimate.
How do I convert petagray to rad?
Multiply the petagray value by 1e+17. The converter above does this instantly to whatever precision you set.
How do I convert rad back to petagray?
Use the reverse factor: 1 rad equals 1e-17 petagrays. You can also use the swap control in the converter above to flip the direction instantly.
What is a petagray?
Petagray (PGy) is a unit of radiation.
What is a rad?
Rad (rad) measures absorbed radiation dose. 'Radiation absorbed dose' — the US customary unit of absorbed radiation dose, fixed at exactly 0.01 gray. It is classified as a non-SI unit, still common in the US.
Is the petagray to rad conversion exact?
Yes. 'Radiation absorbed dose' — the US customary unit of absorbed radiation dose, fixed at exactly 0.01 gray. That fixed definition is what the converter above uses, so any rounding you see is a display choice, not a limitation of the math.
What is the difference between rad vs. gray?
Both measure absorbed radiation dose; the gray is the modern SI unit while the rad is the older US customary unit, related by 1 gray = 100 rad exactly.