Measure your vertical from one video.
VertChecker detects takeoff and landing in a phone video, calculates your flight-time height, and lets you verify the exact event frames.
Film one jump from the side, upload the original clip, and review the result in inches or centimeters. A pose model tracks the athlete, contact detection proposes takeoff and landing, and projectile physics converts elapsed flight time into height. Automatic timing is an estimate, so every result includes a frame-by-frame review tool and quality warnings.
Vertical jump calculator
Free online vertical jump calculator: enter your hang time and projectile physics returns your jump height (h = g·t²/8) in inches and centimeters. 0.5 s of air time is a 12.1 in (30.6 cm) vertical; 0.7 s is 23.6 in (60.1 cm). Don't know your hang time? Upload a video and VertChecker times your flight automatically, frame by frame.
Vertical jump, explained: the test, the physics, the benchmarks
How do I test my vertical jump?
Film one jump from the side and upload the clip. VertChecker tracks your body frame by frame, times your flight, and converts it to jump height with projectile physics. No wall, no chalk, no Vertec: a phone at 60 fps is the whole setup.
How high can I jump?
The only way to know your number is to measure it with a consistent protocol. Record one jump, upload it, inspect the takeoff and landing frames, and compare future attempts made with the same jump style, camera setup, and landing instruction.
What is a good vertical jump?
A good vertical depends on age, sex, sport, training, and the test method. In Statistics Canada's force-plate countermovement-jump data, the median for ages 20–24 was 49.4 cm (19.4 in) for males and 31.8 cm (12.5 in) for females; approach and jump-and-reach results are not directly comparable.
How does VertChecker measure a vertical jump from video?
A pose model tracks the athlete, contact detection proposes takeoff and landing, and physics converts the elapsed time to height with h = g·t²/8. The formula assumes takeoff and landing occur at the same centre-of-mass height, so VertChecker also exposes the event frames and technique warnings.
How accurate is a video vertical jump test?
At 60 fps one frame is about 16.7 ms; at 240 fps it is about 4.2 ms, but timing resolution is not the same as total accuracy. Automatic contact detection can drift by multiple frames on messy clips, so treat it as an estimate and verify or correct the events in the frame seeker before trusting the number.
Do I need special equipment for a vert test?
No: any modern phone can check your vertical. Film side-on from 3–5 meters at 60 fps or higher (120 or 240 fps slow-mo capture is even tighter), keep your whole body in frame, and upload straight from the camera roll.
Does it work for a running approach jump?
Yes, flight time can estimate both standing and approach jumps, but compare each jump style only with the same style. Keep one jump per clip, stay visible from before takeoff through landing, and avoid tucking or reaching the feet down because landing position changes the estimate.
Is there a free online vertical jump calculator?
Yes. The calculator on this page converts hang time to jump height with the exact physics the analyzer uses (h = g·t²/8): type your air time in seconds and read your vertical in inches and centimeters. If you don't know your air time, upload a video and VertChecker measures it frame by frame.
Is VertChecker free?
Your first analysis is free, no account needed. Signing in adds 2 more free. After that, credit packs start at $3.75 for 5 analyses, or unlimited plans start at $3 a month. Cancel anytime.