Calculate your vertical jump needed to dunk a basketball based on height, standing reach, and hand size with training recommendations.
Dunking a basketball is one of the most exciting and coveted skills in sports. Whether you can dunk depends on a simple physics equation: your standing reach plus your vertical jump must exceed the rim height (10 feet / 120 inches) by enough to get the ball over the rim and down through the hoop. For a standard dunk, you need approximately 6 inches above the rim to palm and push the ball through.
The required vertical jump varies tremendously based on height and arm length. A 5'10" player with average reach might need a 36-inch vertical leap, while a 6'4" player with long arms might only need 22 inches. Hand size also matters—players who can't palm the ball need additional height to dunk with two hands or use a cradle technique.
This calculator computes exactly how much vertical jump you need to dunk, factors in hand size and dunk style, estimates your current theoretical vertical, and provides a training plan to close the gap between your current ability and your dunking goal.
This calculator gives you an exact target vertical jump, letting you set realistic training goals and track progress toward your dunking ambition. Keep these notes focused on your operational context. Tie the context to the calculator’s intended domain. Use this clarification to avoid ambiguous interpretation. Align this note with review checkpoints. Apply this where interpretation shifts by use case.
Vertical needed = (Rim height + clearance) - Standing reach. Standard rim = 120 inches (10 ft). One-hand dunk clearance = 6". Two-hand dunk clearance = 8". Standing reach estimate = Height × 1.33 (average). Hang time = 2 × √(2 × jump height / gravity).
Result: Need 36" vertical jump
A 5'10" person with 90" standing reach needs to reach 126" (10ft rim + 6" clearance) to dunk one-handed. That requires a 36-inch vertical jump (126 - 90 = 36).
Dunking is fundamentally about vertical displacement. The distance your center of mass travels upward determines your vertical jump height. For a standard 10-foot rim, you need your hand (holding the ball) to reach approximately 126 inches for a basic one-hand dunk. This means your standing reach plus vertical jump must equal at least 126 inches. Two-handed dunks require about 128-130 inches due to the wider grip.
Standing reach—not height alone—is the most important measurement for dunking potential. Two players of the same height can have dramatically different standing reaches based on arm length and shoulder height. In the NBA Combine, wingspan typically exceeds height by 2-6 inches, and standing reach averages about 1.34× height. Players like Kawhi Leonard (6'7" with 7'3" wingspan) have extreme reach advantages.
Building a dunk-worthy vertical starts with strength (squats, deadlifts, lunges), transitions to power (Olympic lifts, weighted jumps), and peaks with plyometrics (depth jumps, box jumps, approach work). Most programs run 8-16 weeks with 3-4 sessions per week. Beginners should focus on the strength phase first, as plyometrics are only effective when built on a foundation of lower-body strength (1.5-2× bodyweight squat recommended).
It varies by height. A 5'8" person typically needs 38-42 inches, 6'0" needs 28-34 inches, and 6'4" needs 20-26 inches. Arm length significantly affects these numbers.
Average standing reach is about 1.33× your height. A 6'0" person usually has a standing reach around 96". Longer arms (1.35×+) give a significant dunking advantage.
Yes, but it requires an exceptional 42-46 inch vertical, which is NBA-caliber athleticism. Spud Webb (5'7") won the 1986 NBA Slam Dunk Contest with a reported 42" vertical.
One-handed dunks require less reach (about 2" less clearance) but you must be able to palm the ball. Two-handed dunks are easier to control but need you to reach higher above the rim.
Most athletes can add 4-8 inches to their vertical in 8-12 weeks with dedicated plyometric training. Elite programs may yield 8-12 inches over 6 months. Genetics play a significant role.
Yes—every pound of body fat you lose without losing muscle increases your power-to-weight ratio. Losing 10 lbs can add 1-2 inches to your vertical jump.