Radiation Dose
radtoGy
Convert rad (radiation absorbed dose) (rad) to grays (Gy).
Factor1 rad = 0.01 Gy
Converter
rad
Accepts numbers or expressions, e.g. 150 + 14.7
Result
Gy
Rendered to 6 significant figures.
Formula
Formula
Gy = rad × 0.01
Multiply any value in rad (radiation absorbed dose) by 0.01 to obtain the value in grays.
Worked example
Convert 100 rad to Gy.
- 01Start with 100 rad.
- 02Multiply by the conversion factor: 100 × 0.01 = 1 Gy.
Result100 rad = 1 Gy
Conversion table
| rad | Gy |
|---|---|
| 1 | 0.01 |
| 2 | 0.02 |
| 5 | 0.05 |
| 10 | 0.1 |
| 20 | 0.2 |
| 50 | 0.5 |
| 100 | 1 |
| 200 | 2 |
| 500 | 5 |
| 1000 | 10 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the conversion factor from rad to Gy?
1 rad equals 0.01 Gy. To convert, multiply the value in rad (radiation absorbed dose) by 0.01.
How do I convert 1 rad to Gy?
1 rad = 0.01 Gy. For any value, multiply by 0.01.
How do I convert Gy back to rad?
Divide by the same factor — or equivalently, multiply by 100. So 1 Gy = 100 rad.
When would I need to convert rad (radiation absorbed dose) to gray?
Radiation absorbed-dose conversions between rad and Gy are used in radiological protection, medical physics, and nuclear-industry health physics. Gray (Gy) is the SI standard; rad remains common in older US health-physics documentation (1 Gy = 100 rad).
Is the conversion exact?
The factor shown is precise to at least 7 significant figures. For most process-engineering work this is far better than instrument accuracy. For metrology or trade applications, refer to the relevant national standard (NIST, BIPM, ISO 80000).