Dunk Calculator
Can you throw down a dunk? This calculator figures out your standing reach from your height and arm length, then tells you exactly how high you need to jump to get your hand above the rim. If you know your vertical jump, it will tell you whether you can dunk right now or how close you are.
Here's the math behind dunking: your standing reach plus your vertical jump has to get your fingertips about 6 inches above the 10-foot rim. That means you need to touch at least 10 feet 6 inches (126 inches) in the air.
For example, someone who is 6'0" with a 30-inch arm (fingertip to shoulder) has a standing reach of about 92 inches. They would need a vertical jump of 34 inches to dunk on a standard rim. That is achievable for an athletic person but takes serious training for most.
Standing reach varies a lot between people of the same height. Wingspan matters more than height alone, which is why some shorter players like Spud Webb (5'7") and Nate Robinson (5'9") could dunk while taller people sometimes cannot. If you do not know your exact arm length, a rough estimate is that standing reach is about 1.33 times your height.
Tips to increase your vertical jump:
- Plyometric exercises (box jumps, depth jumps)
- Squats and deadlifts for lower body strength
- Calf raises and jump squats
- Consistent stretching and flexibility work
- Allow adequate recovery between jump training sessions