Rad is 0.01 gray.
Rads to Nanograys Converter — rad to nGy
Convert Rad (rad) to Nanogray (nGy) using the exact conversion factor (1 rad = 10,000,000 nanogray). See the formula, worked examples, conversion table, and common uses.
Rads 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 0.01 / 1e-9.
Absorbed Dose units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Rads to Nanograys
Rad 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. Rad is most often used for us radiation therapy dose records (historically).
Formula
nanograys = rads × 10000000
This factor comes from each unit's defined relationship to the category's base unit: 1 rad equals 0.01 base units, and 1 nanogray equals 1e-9 base units, so dividing one by the other gives the direct rad-to-nanogray factor of 10000000.
Simple example
1 rad × 10000000 = 10,000,000 nGy
1 rad = 10,000,000 nanograys.
Real-world example
10 rad × 10000000 = 100,000,000 nGy
10 rads = 100,000,000 nanograys.
Conversion table
| Rad (rad) | Nanogray (nGy) |
|---|---|
| 0.001 rad | 10,000 nGy |
| 0.01 rad | 100,000 nGy |
| 0.1 rad | 1,000,000 nGy |
| 1 rad | 10,000,000 nGy |
| 10 rad | 100,000,000 nGy |
| 100 rad | 1,000,000,000 nGy |
Reverse conversion: Nanogray to Rad
1 nGy × 1e-7 = 1e-7 rad
1 nanogray = 1e-7 rads.
rads = nanograys × 1e-7
For a page dedicated to this direction, see Nanogray to Rad.
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
Understanding the Nanogray (nGy)
Nanogray is 1e-9 gray units.
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 nanograys are in 1 rad?
1 rad equals 10,000,000 nanograys, using the exact defined conversion factor rather than an estimate.
How do I convert rad to nanogray?
Multiply the rad value by 10000000. The converter above does this instantly to whatever precision you set.
How do I convert nanogray back to rad?
Use the reverse factor: 1 nanogray equals 1e-7 rads. You can also use the swap control in the converter above to flip the direction instantly.
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.
What is a nanogray?
Nanogray (nGy) is a unit of radiation.
Is the rad to nanogray 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.
Where is the rad still used today?
Still used in some US medical and historical contexts alongside the SI gray