Dunk Calculator 2025 – Your Vertical Jump Requirements

What Your Result Actually Means

Your dunk gap tells you how many inches of vertical jump you’re missing to clear the rim with a ball in hand. Here’s the honest breakdown by zone — including when each training approach is and isn’t appropriate.

0–3 Inches Away — You’re Closer Than You Think

You’re not far. You don’t need a 12-week overhaul. You need 4–6 weeks of focused plyometric work — depth jumps, approach practice, and technique refinement.

One thing nobody tells you at this stage: a lot of people at this gap already have the vertical but can’t convert it into a dunk because of timing and approach. Before you train more, film your attempts and check your approach angle first. You might be surprised.

⛔ Not ideal when: You’ve already been doing focused plyometrics for 4+ weeks with no progress at this gap — that signals a technique problem, not a strength problem. Get a coach to review your approach before adding more volume.

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4–6 Inches Away — The Most Common Zone

This is where the majority of people land. Realistic timeline with dedicated training: 8–12 weeks. That’s honest. That’s not glamorous. But that’s what the data shows.

The athletes in this range who actually dunk are the ones who stop program-hopping and commit to one structured plan for a full 12 weeks. Consistency beats intensity here.

⛔ Not ideal when: You’ve done a full 12-week block and closed less than 3 inches — re-evaluate your strength base. Plyometrics without sufficient squat strength produce diminishing returns fast.

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7–10 Inches Away — A 3 to 6 Month Project

This is a real commitment. The gap is almost always closeable. You need progressive overload, strength foundations first, and realistic expectations about the timeline.

If you’re 7+ inches away, the biggest mistake is jumping straight into plyometrics without building a strength base first. Squats and deadlifts need to come before depth jumps. More on this in the training section.

⛔ Not ideal when: Your squat is below 1x bodyweight. Do not begin plyometric training here — the injury risk without a strength base is significant. Spend 6–8 weeks on strength only first.

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10+ Inches Away — Long-Term Athletic Development

This is a 6–12 month project minimum — and that’s okay. The question isn’t whether you can get there. It’s whether you’re willing to treat it like the athletic project it is: structured phases, strength first, then explosiveness, then dunking practice.

The athletes who close this gap do it in phases, not programs.

⛔ Not ideal when: You’re looking for a quick fix or a single program. This gap requires phase-based periodization. Any product promising results in under 8 weeks at this gap should be ignored.

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The Dunk Formula — Explained in Plain English

The math behind dunking is simple. Most people overcomplicate it.

Here’s the core formula:

Required Vertical = (Rim Height + Clearance) − Your Standing Reach

Where:

• Rim Height = 120 inches (10 feet standard)
• Clearance = 6 inches (minimum to grip and finish — not just graze)
• Standing Reach = height your fingertips reach standing flat-footed, arm fully extended

So your target is 126 inches of total upward reach. Subtract your standing reach, and what’s left is how high you need to jump.

A real example: You’re 6’0″. Your standing reach is roughly 96 inches. 126 − 96 = 30 inches needed. If you currently jump 22 inches, your gap is 8 inches.

Simple. The problem is most people don’t know their actual standing reach — so they use height estimates that are off by 3–5 inches and wonder why their results feel wrong.

Why Standing Reach Matters More Than Height

Two players at 6’0″ can have completely different standing reaches depending on arm length, wingspan, and shoulder mobility. One might reach 95 inches. Another might reach 100 inches. That 5-inch difference means one needs a 31-inch vertical to dunk, and the other needs only 26.

Same height. Five inches difference in required vertical. Just because of arm length.

This is why wingspan is not optional information — it’s more predictive of your dunk ability than your height.

One-Hand vs. Two-Hand — Different Requirements

A two-handed dunk requires your palm to clear the rim with the ball gripped between both hands. A one-handed dunk only requires one hand to get the ball over the rim — meaning your effective reach is slightly higher.

For most people, a one-handed dunk is 1–2 inches easier than a two-handed dunk. If you’re borderline, this distinction matters.

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How to Measure Your Inputs Accurately

Bad inputs = useless results. Most calculators skip this entirely — which is a massive gap because most people are measuring wrong.

How to Measure Your Standing Reach (Step-by-Step)

What you need: A wall, tape measure, and chalk or a sticky note.

1. Stand flat-footed against the wall. No tiptoeing — heels down, back straight.
2. Raise your dominant arm fully. Elbow straight, wrist locked, fingers together and extended.
3. Have someone mark where your middle fingertip touches the wall.
4. Measure from the floor to that mark.

That’s your standing reach.

The most common mistake: People rise slightly onto their toes without realizing it. Even a half-inch on your toes adds 1–2 inches to your reach. If you measure this way, you’ll think you need less vertical than you actually do — and you’ll wonder why dunking still feels impossible when “the calculator said I should be there.”

Stay flat. Measure honest.

How to Measure Your Vertical Jump at Home

Two methods — pick the one you can actually do:

Method 1 — Wall Method Chalk your fingertips. Stand beside the wall, mark your standing reach. Jump as high as possible and touch the wall. Measure the difference between your standing reach mark and your jump mark. That’s your vertical.

Do this 3 times. Take your best result.

Method 2 — My Jump 2 App (Free) Record your jump in slow motion on your phone. The app measures your hang time and calculates your vertical within 1–2 inches of professional equipment. More consistent than the wall method if you’re alone.

Important: Most dunk calculators assume your running vertical, not your standing vertical. Your running vertical is typically 2–4 inches higher because of approach momentum. If you’re measuring standing vertical, add 2–3 inches when entering it for a more accurate result.

Measuring Your Wingspan (And Why It Matters)

Wingspan is fingertip to fingertip with both arms spread fully horizontal. The average person’s wingspan roughly equals their height. But athletes — especially basketball players — often have wingspans 2–4 inches longer.

Wingspan vs. Height	Typical Effect on Required Vertical
Equal to height	Standard calculation applies
+2 inches over height	~2 inches less vertical needed
+4 inches over height	~4–5 inches less vertical needed
+6 inches over height	~6–8 inches less vertical needed

If your wingspan exceeds your height by 4+ inches, you might need 10–15% less vertical than someone the same height with shorter arms.

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How High Do You Need to Jump to Dunk? (Chart by Height)

Here’s the practical reference table. These assume average arm proportions — if your arms are longer or shorter than average, your numbers will differ.

Height	Est. Standing Reach	Required Vertical	NBA Max Vertical (Avg)	Gap vs. NBA
5’6″	90″	36 inches	36″	0″
5’8″	94″	32 inches	36″	−4″
5’10”	96″	30 inches	36″	−6″
6’0″	98″	28 inches	36″	−8″
6’2″	100″	26 inches	36″	−10″
6’4″	102″	24 inches	36″	−12″
6’6″	104″	22 inches	36″	−14″

Source: NBA Combine data; standing reach estimated from average wingspan-to-height ratio.

One thing this table makes clear: most recreational players aren’t trying to match NBA verticals. They just need to clear the bar for their height. A 6’2″ person needs 26 inches — achievable for almost anyone who trains consistently.

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Where You Stand vs. NBA Players

Most people have no reference point for their number. Is 28 inches good? Is it average? Without context, the number means nothing.

NBA Combine Vertical Jump Averages by Position

Position	No-Step Vertical (Avg)	Max Vertical (Avg)	Notable High
Point Guard	29.8″	37.0″	Ja Morant: 44″
Shooting Guard	28.9″	36.1″	Zach LaVine: 46″
Small Forward	28.4″	35.8″	—
Power Forward	27.1″	34.3″	—
Center	25.6″	32.7″	—

Source: NBA Combine historical data (2000–2024).

The average recreational male has a vertical of around 16–20 inches. The average NBA player has a max vertical of 35–37 inches. The gap between “recreational” and “NBA” is roughly 15–18 inches — which sounds huge until you realize you’re not trying to match an NBA player. You’re just trying to clear 126 inches of total reach. That’s a much smaller gap.

What “Average” Actually Means for Your Age Group

Age Group	Average Vertical Jump (Recreational)
15–20	20–24 inches
20–30	18–22 inches
30–40	16–20 inches
40+	14–18 inches

Trained athletes at every age group sit 8–12 inches above these baselines consistently.

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The Spud Webb Effect — What Short Dunkers Prove

This section matters not because of Spud Webb’s story (you’ve heard it), but because of what his measurements actually tell you about your own situation.

Spud Webb — the real numbers:

• Height: 5’7″
• Estimated standing reach: ~86 inches
• Measured vertical: 42–46 inches (sources vary)
• Gap he needed to close: 126 − 86 = 40 inches

He needed a 40-inch vertical. He achieved it. That’s not inspiration content — that’s a data point. It tells you that vertical jump is trainable to extremes that most people never test.

Nate Robinson — 3x Slam Dunk Champion:

• Height: 5’9″
• Measured vertical: ~43 inches
• Key insight: Robinson’s technique was as responsible as his raw vertical. He approached at a specific angle, planted perfectly, and timed his extension precisely. He didn’t just jump high — he jumped smart.

The practical lesson: If you’re 5’10” needing a 30-inch vertical, you are closer to dunking than Spud Webb was when he started training seriously.

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Can You Dunk? Real Answers by Height

Can a 5’10” Person Dunk?

Yes — and it’s more common than you think.

• Required vertical at 5’10”: approximately 30 inches
• Average untrained vertical at 5’10”: 18–20 inches
• Training gap to close: 10–12 inches
• Realistic timeline: 4–6 months with proper programming

The 5’10” person who can’t dunk isn’t being limited by height — they’re being limited by not having trained their vertical specifically. The approach jump is also critical at this height: a running start adds 3–5 inches over a standing jump.

Can a 6’0″ Person Dunk?

• Required vertical: approximately 28 inches
• Many recreational 6’0″ players already jump 22–26 inches naturally
• Gap to close: often just 4–6 inches
• Realistic timeline: 8–10 focused weeks

At 6’0″, you’re genuinely close if you’ve never specifically trained for it.

Can a 6’2″ Person Dunk?

• Required vertical: approximately 26 inches
• If you’re 6’2″ and untrained, you might already be within 2–4 inches
• Bigger limiting factor is often technique, not vertical

Film yourself. Check if you’re planting correctly and using your arm swing — both add 2–4 inches without any additional strength training.

Can a Short Person Ever Dunk?

Yes, depending on how “short” you define it. 5’7″? Spud Webb won an NBA dunk contest at that height. 5’4″? You’re looking at a serious long-term project, but the number isn’t zero.

The shorter you are, the more vertical you need, and the harder it gets. But “hard” is not the same as “impossible.” The question is always: how much are you willing to train, and over what timeframe?

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Approach Jump vs. Standing Jump — The Distinction Nobody Explains

Your standing vertical and your approach vertical are not the same number — and for most people, the difference is dunking or not dunking.

Jump Type	Typical Vertical	Key Mechanism
Standing vertical	Baseline	Pure leg power from dead stop
Approach vertical (beginner)	+3–4 inches	Partial momentum conversion
Approach vertical (trained)	+5–8 inches	Full elastic energy + arm drive

The two-step approach: Your body loads elastic energy in your Achilles and quads during the penultimate step. Combined with your arm swing, this is what gives approach jumps their additional height.

If you’ve never practiced your approach, this is free vertical you’re leaving on the table.

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If X → Choose Y: Your Decision Engine

Use this section to figure out exactly where to focus — before you train a single rep.

Your Situation	Best First Action
Gap 0–3 inches + never filmed approach	Film and fix approach before any training
Gap 0–3 inches + approach looks correct	4-week plyometric block (depth jumps, approach practice)
Gap 4–6 inches + squat < 1x bodyweight	Strength first (6 weeks) before any plyometrics
Gap 4–6 inches + squat ≥ 1x bodyweight	10-week combined block (strength + plyometrics)
Gap 7–10 inches	Phase-based: 2 months strength → 2 months explosiveness → dunk practice
Gap 10+ inches	Long-term periodization only; no single program solves this
Can’t touch rim yet	Strength base is the priority — no plyometrics
Can touch rim, can’t dunk	Technique first — approach, arm drive, grip practice
Verticals don’t improve after 8 weeks	Deload 1 week, then change one training variable
5’10” or shorter	Running approach is non-negotiable — adds 4–5 free inches
Female athlete + large gap	Extended strength phase (3 months) before plyometrics

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Your Training Roadmap — Based on How Far Away You Are

This isn’t a generic “train your legs” section. This is specific, tiered, and honest about timelines.

0–3 Inches Away — The 4-Week Sprint

Weeks 1–2: Approach Perfection Film your attempts. Most people in this range are failing at the approach, not the jump. Work on your two-step plant and arm drive — 20 minutes every other day.

Weeks 2–4: Plyometric Sharpening

• Depth jumps: 4 sets × 5 reps, 3x per week
• Single-leg bounds: 3 sets × 8 each leg
• Box jumps (maximum effort): 3 sets × 5

Realistic outcome: Most people close a 0–3 inch gap in 4 weeks. The ones who don’t usually have technique errors they haven’t caught yet.

4–6 Inches Away — The 10-Week Build

Weeks 1–3: Strength Foundation

• Squats: 3×8 at moderate-heavy load, 3x per week
• Romanian deadlifts: 3×10
• Calf raises: 4×15 (slow eccentric)
• Core: Planks, dead bugs, bird dogs

Weeks 4–7: Explosive Power Phase

• Depth jumps: 4×5, 3x per week
• Approach jumps to target: maximum effort, 10–15 reps per session
• Bulgarian split squats: 3×8 each leg
• Reactive hops: 3×10

Weeks 8–10: Peak + Dunk Attempts

• Reduce training volume by 30%
• Increase approach jump practice to daily (short sessions)
• Attempt dunks every other day — film everything
• Contrast training: heavy squat set followed immediately by max-effort jump

Realistic outcome: 6–9 inches of vertical improvement over 10 weeks is documented in sports science research for untrained-to-intermediate athletes.

7–10 Inches Away — The 6-Month Project

Phase 1 (Months 1–2): Strength Foundation — Non-Negotiable

Do not do plyometrics yet.

• Squat to 1.5x bodyweight (goal)
• Deadlift to 2x bodyweight (goal)
• Single-leg strength work daily

Phase 2 (Months 3–4): Explosive Development Add plyometrics on top of the strength base:

• Depth jumps, box jumps, approach jumps
• Test vertical at end of month 4

Phase 3 (Months 5–6): Peak Performance + Dunk Practice

• Contrast training (heavy lift immediately followed by max jump)
• Daily approach practice
• Active deload in final 2 weeks before testing

Realistic outcome: 10–14 inches of vertical improvement is achievable over 6 months for motivated athletes who follow this sequence. Athletes who skip Phase 1 plateau around week 8.

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The 5 Most Effective Exercises for Vertical Jump

Not a list of 15 exercises you’ll never remember. Five things that actually move the needle, ranked by evidence.

1. Depth Jumps

Step off a box (start 12 inches, progress to 24), land, and immediately explode upward. Ground contact time should be under 0.2 seconds.

Trains the stretch-shortening cycle — the elastic mechanism responsible for the “bounce” in your jump. Not trainable with regular squats.

Volume: 4 sets × 5 reps. Never do these fatigued.

2. Heavy Back Squats (85–90% of 1RM)

Strength is the ceiling for explosiveness. Heavy squats 2x per week build the force production capacity that plyometrics learn to express quickly. Athletes who skip heavy lifting and only do plyometrics plateau fast.

3. Bulgarian Split Squats

Most people jump off two legs but push harder off one. Unilateral strength is often the limiting factor nobody addresses.

3 sets × 8 reps each leg, heavy load, full depth.

4. Approach Jump Practice

Technically a skill drill, not an exercise — but it produces more dunks than any exercise on this list. Most people’s ceiling isn’t their vertical, it’s their approach.

Practice the 2-step approach 15–20 times per session, 4x per week.

5. Single-Leg Box Jumps

Step off a box from one foot, land on two. Trains the approach-jump motor pattern specifically. Start with a 12-inch box. Progress to 24 inches.

4 sets × 5 reps each leg.

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Dunk Calculator for Youth Basketball — Lower Rim Heights

A 10-year-old doesn’t play on a 10-foot rim. If you’re calculating for a child or adjusting for your specific gym, these numbers matter.

Age Group	Recommended Rim Height	Required Vertical (5’0″ child)	Required Vertical (5’6″ child)
Under 7	6 feet (72″)	6 inches	Already there
Ages 7–8	7 feet (84″)	12 inches	6 inches
Ages 9–11	8.5 feet (102″)	18 inches	12 inches
Ages 11–13	9 feet (108″)	22 inches	16 inches
14+	10 feet (120″)	Standard calculation	Standard calculation

For parents and coaches: Always use the appropriate rim height for their age. Training toward a 10-foot rim at age 9 is discouraging and physically unnecessary. The confidence from dunking on an age-appropriate rim matters for motivation and development.

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Women’s Dunking — The Honest Guide

The Real Numbers for Female Athletes

The WNBA uses a 10-foot rim. Same as the NBA. There is no height reduction for women’s professional basketball.

• Average vertical jump for recreational female athletes: 12–16 inches
• Average vertical jump for trained female basketball players: 18–24 inches
• Required vertical for a 5’11” woman with a 98-inch standing reach: 28 inches

That’s exactly the same math as a 6’0″ man.

Female Athletes Who Have Dunked

Brittney Griner (6’9″) — the only WNBA player to dunk in a regulation game. She has done it twice (2014). Her estimated vertical is 26–28 inches. Her exceptional height and reach make the math work.

Candace Parker — dunked twice in NCAA competition at 6’4″ with exceptional athleticism.

The honest reality: Women dunking on a 10-foot rim in game conditions is rare at any height below 6’4″ because the combination of required vertical and ball-handling skill at peak elevation is exceptionally demanding. Dunking on practice rims, lowered rims, or youth rims is achievable for many trained female athletes at average heights.

Training Differences for Female Athletes

The training principles are identical. Two practical differences:

1. Extended strength phase. Female athletes typically start with lower strength-to-bodyweight ratios. The strength foundation phase should be 3 months rather than 6–8 weeks.

2. Caloric intake requires more attention. Female athletes in intense training frequently under-eat, which impairs recovery and halts strength gains. If you’re training hard and not improving, check your food intake before changing your program.

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Dunk Types and What Each One Actually Requires

Dunk Type	Additional Vertical Required	Difficulty	Key Requirement
Two-Hand Power Dunk	0 (baseline)	1/10	Control
One-Hand Basic	0 (same or slightly less)	2/10	Palm size / grip
One-Hand Tomahawk	+2–3 inches	4/10	Arm strength at peak
Reverse Dunk	+3 inches	5/10	Body control
Alley-Oop Catch	+1–2 inches	5/10	Timing
Windmill	+4–5 inches	7/10	Hang time
360°	+6–7 inches	8/10	Spatial awareness
Between the Legs	+8–10 inches	9/10	Extreme hang time
Double Pump	+10+ inches	10/10	Elite hang time only

One thing most people get wrong: The one-hand dunk is easier than the two-hand dunk for most people. Your effective reach is slightly higher with one hand because you’re not gripping a ball between two palms. If you’re borderline, try one-hand first.

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Genetics and Dunking — The Truth Nobody Wants to Hear

Yes, genetics matter. No, they don’t matter as much as the fitness content industry implies.

What Genetics Actually Affect

Fast-twitch fiber ratio: People with naturally higher fast-twitch muscle fiber percentages generate explosive power more easily. It’s also partially trainable — plyometric training shifts some slow-twitch fibers toward hybrid characteristics.

Achilles tendon elasticity: Longer, more elastic Achilles tendons store and return energy more efficiently during jumps. This is largely genetic and largely fixed — one of the main reasons some people seem to have a natural “bounce.”

Limb proportions: Longer legs relative to torso height = mechanical advantage for jumping. Longer arms = less vertical required. These are fixed. Knowing your proportions helps set realistic expectations.

What Genetics Don’t Affect (As Much As You Think)

A 2025 study found that common “athletic” genetic markers (ACE, ACTN3 polymorphisms) had minimal impact on actual vertical jump gains post-training in basketball players. Athletes without optimal genetic profiles still improved 12–15% on average.

Translation: your genetics set your ceiling, but most people never get close to their ceiling because they train inconsistently or with poor programming. The ceiling is almost never the problem.

The Honest Conclusion on Genetics

If you’re 5’6″ dreaming of dunking, genetics matter more than if you’re 6’2″. That’s just math. But the answer is still “train your vertical systematically” — just with a longer timeline and more realistic expectations.

Nobody’s genetics prevent them from training. They only affect how long it takes and how high the ceiling is.

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Mental Training — The Part Everyone Skips

This is a real, documented factor in dunk success. Not inspiration content. Actual performance science.

Why People Who “Have the Vertical” Still Can’t Dunk

An athlete tests at 32 inches vertical in a testing environment but can’t execute a dunk in practice. The issue is almost never physical at that point.

Fear of missing creates a hesitation in the approach that shortens the jump by 2–4 inches. It’s measurable. When you approach tentatively, your penultimate step is softer, your arm drive is weaker, and your peak height is lower.

The fix: lower the rim until you’re dunking confidently, then raise it incrementally. Build the motor pattern at a height where success is guaranteed, then gradually raise the bar.

Visualization Works — Here’s Why

Sports psychology research consistently shows that mental rehearsal activates similar neural pathways as physical practice. Five minutes of detailed visualization before a session — approach, plant, drive, reach, finish — creates a stronger motor pattern than the same five minutes spent on anything else.

Dealing with Plateaus

Plateaus are adaptation completions. Your body has adapted to the current stimulus. The solution is not more of the same — it’s changing one variable: add 20% more volume, switch the exercise, change the rep range, or take a full deload week.

One athlete stuck at 28 inches for 8 months trained 6 days per week. He took a full week off, came back, and hit 31 inches on day one. The plateau was fatigue masking capacity — not a real ceiling.

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Common Myths Debunked

Myth 1: “You need a 40-inch vertical to dunk”

Reality: Most players need 24–32 inches depending on height. Zach LaVine has a 46-inch vertical. You don’t need to be Zach LaVine. You just need to clear 126 inches of total reach.

Myth 2: “Heavy weights kill your vertical”

This is backwards. Maximum strength is the foundation of explosive power. Heavy squats at 85–90% of your max, combined with plyometrics, produce better vertical jump results than plyometrics alone. The research on this is consistent.

Myth 3: “Jumping ability is purely genetic”

Studies show 8–14 inch gains are consistently achievable with proper programming. That’s not genetic. That’s training.

Myth 4: “Dunk calculators are 100% accurate”

They’re not. Calculators give you the minimum vertical requirement based on measurements. Real dunking also requires ball control at peak height, correct approach timing, and the ability to execute the physical skill under non-testing conditions. The number tells you if you have the physical capacity. The rest is practice.

Myth 5: “Taller people always have an easier time dunking”

Height helps. Reach is what actually matters. A 6’4″ player with short arms might need the same vertical as a 6’0″ player with long arms. Standing reach — not height — is the correct input for this calculation.

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If You Only Remember One Thing

Your standing reach — not your height — determines how high you need to jump. Measure that first. Everything else follows from there.

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Frequently Asked Questions

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Methodology Note

This calculator is built on publicly available sports science data and biomechanical research — not personal coaching credentials. Here’s exactly where every number comes from:

Formula source: The dunk calculation is based on standard biomechanics: Target Reach (126″) minus Standing Reach = Required Vertical. The 6-inch clearance figure is derived from the average palm-to-ball-contact distance needed to grip a regulation basketball above the rim.

Data sources: NBA Combine vertical jump averages, sports science literature on plyometric training outcomes (2022–2025), and independently verified case studies.

Last updated: [May 2026]

References

1. NBA Combine Draft Data — Official vertical jump measurements by position (no-step and maximum), 2000–2024. nba.com/stats
2. NSCA — National Strength and Conditioning Association — Essentials of Strength Training and Conditioning, 4th Edition. Guidelines for plyometric training progressions and depth jump programming. nsca.com
3. Journal of Strength and Conditioning Research — “Effect of Combined Heavy Resistance and Plyometric Training on Vertical Jump Performance.” Documents 8–14 inch gains in untrained-to-intermediate athletes over 8–12 weeks. journals.lww.com/nsca-jscr
4. FIBA Official Rules — Article 2: Playing Court — Official rim height specifications at 3.05 meters (10 feet). fiba.basketball/document/fiba-official-basketball-rules-2022
5. International Journal of Sports Physiology and Performance — “Genetic Determinants of Athletic Performance: ACE and ACTN3 Polymorphisms and Vertical Jump Gains Post-Training.” (2025). humankinetics.com/ijspp
6. American College of Sports Medicine (ACSM) — Position stand on resistance training for explosive power development. acsm.org/education-resources/journals