Dunk Calculator
The Math of the Dunk
A standard NBA basketball rim is exactly 10 feet (304.8 cm) off the ground. To dunk, you don't just need to touch the rim; you need to get the ball over the rim.
This creates the "Magic Number" for dunking: 10 feet 6 inches (320 cm).
If you can touch 10'6", your hand is high enough to snap the wrist and guide the ball downwards through the hoop.
Standing Reach vs. Height
Many people focus on height ("I'm 6ft tall"), but height doesn't matter as much as Standing Reach.
Standing Reach is how high your fingertips go when standing flat-footed. People with long arms ("Ape Index") have a massive advantage.
If you don't have a wall to measure your reach, a good estimate is:
Standing Reach = Height × 1.335
Example: A 6'0" (72") person usually has a standing reach around 8'0" (96"). This means they only need a 30-inch vertical to touch the rim.
What is a "Good" Vertical Jump?
The vertical jump is the primary measure of explosive power. Here is how you stack up against the competition.
| Rating | Vertical (Inches) | Vertical (cm) |
|---|---|---|
| Average High Schooler | 20" - 24" | 50 - 60 cm |
| Varsity Player | 26" - 30" | 66 - 76 cm |
| D1 College Player | 30" - 35" | 76 - 89 cm |
| Elite (NBA Pro) | 36" - 44"+ | 91 - 112 cm |
Exercises to Increase Vertical
If the calculator says "No Dunk," don't worry. The vertical jump is highly trainable.
- Squats & Deadlifts: Build raw leg strength (force production). Use our 1RM Calculator to track strength.
- Plyometrics: Box jumps and depth jumps teach your muscles to fire quickly (rate of force development).
- Core Strength: Transferring power from your legs to the air requires a stiff core.
- Lose Body Fat: Think about it—it is easier to jump with a 10lb vest, or without it? Losing 10lbs of fat (while keeping muscle) will instantly add 1-2 inches to your vertical. Check our Calorie Deficit Tool.
One Foot vs. Two Feet
Most people have a dominant jumping style.
- One Foot: Relies on speed and momentum. Used for driving dunks (like Lebron James).
- Two Feet: Relies on power and strength. Used for standing dunks under the rim (like Zion Williamson).
Your calculated vertical is likely your "Max" jump, regardless of style.