Dunk Calculator

Dunk Calculator is a free online tool that calculates the exact vertical jump height you need to dunk a basketball based on your height, standing reach, and target rim height.

What is Dunk Calculator?

Dunk Calculator takes your height and standing reach (in centimeters or inches) and a target rim height (default 305 cm, the NBA standard) and outputs the precise vertical leap required to dunk, including a 15 cm wrist clearance. It runs in any web browser with no account required. The tool was created by an independent developer.

Key Features

• Height & Reach Input — Enter your height and standing reach in centimeters or inches.
• Adjustable Rim Height — Use the default NBA 10-foot rim or set a custom height.
• Instant Calculation — Subtracts your standing reach from the rim height plus a 15 cm clearance to give the required vertical leap.
• Dunk Training Roadmap — A 12-week training plan split into three phases: Foundational Strength (Weeks 1-4), Explosive Power (Weeks 5-8), and Perfecting Form (Weeks 9-12).
• FAQ Section — Answers common questions about standing reach measurement, rim heights, vertical jump standards, and training timelines.

Who should use Dunk Calculator?

• Aspiring dunkers who want to know exactly how high they need to jump to slam the ball.
• Coaches and trainers working with basketball players to set vertical jump training targets.
• Shorter players under 6 feet who need a high vertical leap to compensate for height.

What can you do with Dunk Calculator?

• Calculate your required vertical jump: Input your height and standing reach to see the exact leap needed for a given rim height.
• Plan your training: Use the 12-week roadmap to systematically improve your vertical jump with phasic training.
• Understand dunk mechanics: Learn about the science of converting horizontal speed into vertical velocity.

How does Dunk Calculator work?

1. Enter your height and standing reach.
2. Select a target rim height (default 305 cm).
3. Click 'Analyze My Dunk Potential' to get your required vertical leap. The calculator subtracts your standing reach from the rim height and adds a 15 cm clearance for a powerful dunk.

FAQ

What is standing reach and how do I measure it?

Standing Reach is the maximum height you can touch with one hand while standing flat-footed. To measure, stand beside a wall, reach up as high as possible, have a friend mark the point, and measure from floor to mark.

How high is an NBA rim?

The official NBA rim height is 10 feet (305 cm). This standard is used across NBA, WNBA, NCAA, and FIBA. Younger players often use lower rims (6-9 feet).

Can I dunk if I'm under 6 feet tall?

Yes. Height is not the limiting factor; vertical jump is. Players like Spud Webb (5'7") have won NBA dunk contests. A high vertical leap can compensate for shorter stature.

How long does it take to increase my vertical jump?

With consistent training, measurable improvements can be seen in 4-6 weeks. Significant gains of several inches typically take 3-6 months.

Is this dunk calculator accurate?

Yes, because it uses fixed standards and a scientific buffer. Accuracy depends on precise measurement of your standing reach. The result is your required vertical jump, not accounting for a running start which can add height.