This dunk calculator helps estimate whether you can dunk based on your standing reach, vertical jump, rim height, and optional control margin above the rim. Use it either to check if your current jump is enough or to calculate the vertical jump required to dunk.
Dunk Calculator
Select a mode below. In dunk calculations, standing reach is how high you can touch while standing flat-footed, vertical jump is how high you rise off the ground, and rim height is usually 120 inches for a standard 10-foot rim. The control margin is the extra height above the rim you want for a cleaner dunk.
What is a Dunk Calculator?
A dunk calculator estimates whether your jump and reach are high enough to dunk a basketball. Instead of looking only at height, it focuses on the measurements that matter most in practice: your standing reach and your vertical jump. These two values determine your maximum touch height.
Main Formula
The basic calculation is:
If your maximum touch is at least as high as the rim plus the extra control margin, then you likely have enough elevation to dunk.
Dunk Threshold
Touching the rim is not always enough for a comfortable dunk. Many players need some additional height above the rim to control the ball and finish cleanly. This calculator lets you include that extra buffer as a custom control margin.
How to Use It
If you already know your standing reach and vertical jump, use Can I Dunk? to compare your maximum touch against the required dunk height. If you want to know how much vertical you would need, use Vertical Needed.
Example Vertical Requirements
| Standing Reach | Rim Height | Margin | Vertical Needed |
|---|---|---|---|
| 94 in | 120 in | 6 in | 32 in |
| 96 in | 120 in | 6 in | 30 in |
| 98 in | 120 in | 6 in | 28 in |
| 100 in | 120 in | 6 in | 26 in |
| 102 in | 120 in | 6 in | 24 in |
Important Note
This calculator is an estimate. Real dunk ability also depends on approach mechanics, one-foot vs. two-foot jumping style, hand size, ball control, timing, and whether you are dunking a full-size basketball. Still, standing reach and vertical jump give a very useful baseline.