Can you dunk a basketball?
Whether you can dunk comes down to one comparison: the highest point you can touch at the peak of your jump versus how high you have to reach to put the ball through a regulation rim. This calculator does that comparison directly. It adds your standing reach to your vertical jump to get your maximum touch height, then measures it against the rim (120 inches, or 10 feet) plus the clearance you need to actually stuff the ball down.
The formula
The math is simple addition and subtraction:
- Max touch height = standing reach + vertical jump
- Height above rim = max touch height − 120 in (10 ft rim)
- Vertical still needed to dunk = (rim height + clearance) − max touch height
To dunk, your max touch height must be at least the rim height plus clearance. Touching the rim (120 in) is not enough — your hand and the ball have to clear it, so most players use about 6 inches of clearance above the rim, giving a dunk target of roughly 126 inches. If the "vertical still needed" value is zero or negative, you can dunk.
Why standing reach, not height
People with the same height can have very different reaches because arm length and torso proportions vary. A 6'0" (72 in) player often has a standing reach near 96 inches, but that can swing several inches either way. That is why this tool asks for standing reach directly rather than estimating it from height. If you only know your height, a rough estimate is standing reach ≈ 1.33 × height, so a 72-inch person is about 96 inches — but measure it against a wall for a real answer.
Common reference points
- Regulation rim: 10 feet = 120 inches = 305 cm, used in the NBA, WNBA, NCAA, FIBA, and most high schools.
- Dunk target: ~126 inches (rim + ~6 in) to clear a men's size-7 ball; you can dunk a smaller ball with slightly less clearance.
- Typical vertical jumps: a recreational adult often jumps 16–20 inches; a trained athlete 24–28 inches; elite NBA verticals reach 34–40+ inches.
- Rule of thumb: a 6'0" player with a 96-inch reach needs about a 30-inch vertical to dunk cleanly (126 − 96); a 6'4" player with a 102-inch reach needs about 24 inches.