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Enter your values and press calculate.
Jump height calculator
The page keeps a single-column flow while the form fields reflow into three columns on large screens, two on tablets, and one on phones.
Flight path visualization
The chart plots vertical position against time using the same gravity and flight-time assumptions as the calculator.
Physics behind the estimate
Total flight time relation: T = 2v₀ / g
Takeoff velocity: v₀ = gT / 2
Jump height: h = v₀² / 2g = gT² / 8
Peak potential energy: E = mgh
The calculator treats flight time as the full airborne duration from takeoff to landing. Under equal takeoff and landing body heights, the upward trip and downward trip take the same time, so the jump height depends on the square of flight time and the selected gravity.
When body mass is provided, the page also estimates the potential energy gained at the top of the jump. That value reflects gravitational potential only and does not include muscular efficiency, arm swing effects, or impact losses.
Steps for accurate use
- Measure total airtime with a jump mat, camera, or timing system.
- Enter the flight time and choose seconds or milliseconds.
- Select the gravity preset or enter a custom value.
- Optionally enter body mass to estimate potential energy.
- Pick output units and decimal precision that suit your report.
- Press calculate to display results above the form instantly.
- Review the trajectory graph, then export the result as CSV or PDF.
Sample jump outcomes on Earth
| Flight time s | Jump height m | Jump height cm | Takeoff velocity m/s | Time to apex s |
|---|---|---|---|---|
| 0.30 | 0.110 | 11.03 | 1.471 | 0.150 |
| 0.45 | 0.248 | 24.82 | 2.206 | 0.225 |
| 0.60 | 0.441 | 44.13 | 2.942 | 0.300 |
| 0.75 | 0.690 | 68.95 | 3.677 | 0.375 |
| 0.90 | 0.993 | 99.29 | 4.413 | 0.450 |
FAQs
1. What does flight time mean here?
Flight time is the full airborne duration from leaving the ground to touching down again. It is not just the upward phase.
2. Why is the formula based on total airtime?
Under symmetric motion, ascent and descent take equal time. That lets you derive takeoff velocity from total flight time and then compute jump height.
3. Is this accurate for all jump tests?
It works best when takeoff and landing happen at nearly the same body position. Large knee bend differences can overstate or understate actual center-of-mass rise.
4. What if my device measures milliseconds?
Choose milliseconds in the input unit field. The calculator converts the value internally before applying the physics equations.
5. Why include body mass?
Mass is optional because jump height does not require it. It helps estimate the gravitational potential energy gained at peak height.
6. Can I use custom gravity?
Yes. Select custom gravity to model other planets, lab setups, or simplified practice problems with user-defined acceleration.
7. What does the landing velocity show?
It reports the impact speed magnitude predicted by symmetric motion. In ideal motion, it matches takeoff speed before contact losses occur.
8. What is the best way to improve reliability?
Use the same measurement setup each session, average repeated jumps, and keep landing posture consistent with takeoff posture.