Dunk Calculator UK (Vertical Jump & Reach)

Enter Your Details

We will estimate your standing reach automatically.
Please enter a valid height.
Measure flat-footed, one arm extended as high as possible.
Please enter a valid standing reach.
Please enter a valid rim height.
We'll tell you how close you are.

How This Dunk Calculator Helps You

If you are not sure whether your jump is enough to dunk, this calculator gives you a clear target in seconds. Designed for basketball players of all levels, our tool removes the guesswork by calculating the exact vertical leap you need based on your height, standing reach, and dunk goals.

How to Use the Dunk Calculator

Using the tool is incredibly straightforward:

1
Choose your unit

Select Metric (cm) or Imperial (ft/in).

2
Enter your measurements

Input your height or standing reach. If you only know your height, we will estimate your standing reach automatically.

3
Set the hoop height

It defaults to the standard 10-foot professional rim, but you can adjust it for youth sizes.

4
Add your current vertical jump

Optional, but providing it shows your "Dunk Gap" — exactly how many inches or cm you need to add to your game.

5
Click Calculate

Instantly discover if you can dunk, touch the rim, or what you need to improve first.

What Your Result Means

Required vertical jump

This is the pure jumping power you need to elevate your fingers high enough to complete your chosen dunk type. To touch the rim, you need less vertical than completing a clean one-hand slam dunk.

Dunk gap

If you entered your current vertical jump, the dunk gap tells you the difference between where you are now and where you need to be. A small gap means you should focus on technique and ball handling, while a larger gap requires dedicated strength training.

Maximum reach

This is the absolute highest point your hand touches at the peak of your current vertical jump.

Hang time & Take-off velocity

Advanced metrics that showcase the physics of your jump. Take-off velocity measures how fast you leave the floor, and hang time shows how long you remain airborne based on standard gravitational pull.

How to Measure Standing Reach

Your standing reach is far more critical for dunking than your overall height. To measure it accurately:

1

Stand flat-footed facing a wall or backboard.

2

Reach one hand as high as possible without lifting your heels off the ground.

3

Mark the highest point your fingertips touch.

4

Measure the distance from the floor to that mark.

How High Do You Need to Jump to Dunk?

Here is a quick reference chart showing the approximate vertical jump needed for a clean dunk on a standard 10-foot (3.05 m) rim, assuming average standing reach for each height.

HeightEst. Standing ReachApprox Vertical for Clean Dunk
5'8" (173 cm)7'6" (229 cm)36 inches (91 cm)
5'10" (178 cm)7'9" (236 cm)33 inches (84 cm)
6'0" (183 cm)8'0" (244 cm)30 inches (76 cm)
6'2" (188 cm)8'3" (251 cm)27 inches (69 cm)
6'4" (193 cm)8'6" (259 cm)24 inches (61 cm)

Tips to Improve Your Dunk Potential

  • Build lower-body strength: Exercises like heavy squats and deadlifts lay the foundation for explosive power.
  • Use plyometrics: Incorporate box jumps, depth jumps, and bounding to train your nervous system to fire rapidly.
  • Practise approach timing: Your running approach jump is usually higher than a standing vertical leap. The timing of your penultimate step is crucial.
  • Improve grip and ball control: You may have the jumping ability but struggle to hold the basketball securely. Smaller hands may require better grip technique or focusing on two-hand dunks.
  • Recover properly: Vertical leap training is incredibly taxing on joints. Progress gradually and stop immediately if you feel pain in your knees or Achilles.

FAQs

Can I dunk if I am 5'7"?
Yes, you can dunk if you are 5'7", but it requires an elite vertical jump. Spud Webb, famously 5'6", won the NBA Slam Dunk Contest. You will likely need a vertical leap of 40+ inches and excellent technique.
How high do I need to jump to dunk?
It depends on your standing reach. If you have an 8-foot standing reach, you need to jump 24 inches to touch a standard 10-foot rim, and around 30 inches to execute a clean dunk. Use our dunk calculator to find your exact number.
What is standing reach?
Standing reach is the maximum height you can reach with one arm while standing flat-footed. It is a more accurate indicator of your dunk potential than your total height.
Is standing reach more important than height?
Absolutely. Two players can be the same height, but the one with a longer wingspan and higher standing reach will require significantly less jumping energy to reach the hoop.
How much above the rim do I need to dunk?
To safely and cleanly flush the basketball, you typically need to get your fingertips at least 6 inches (about 15 cm) above the 10-foot rim to allow for the diameter of the ball and downward force.
Does hand size matter for dunking?
Yes. A larger palm size makes it easier to palm the basketball, giving you better control in the air. If you cannot palm the ball, you often need to jump slightly higher to "throw" it down or opt for a two-hand dunk for stability.
Can a running approach help me dunk?
Yes. A running approach turns horizontal velocity into vertical lift. Most athletes jump several inches higher off a running approach compared to a standing vertical jump.
How can I improve my vertical jump?
You can improve your vertical leap through a combination of heavy resistance training (squats), reactive plyometrics (box jumps), core strength, and optimizing your jumping technique under professional basketball training supervision.