Jump Flight Time CalculatorFree online fitness & health calculator — instant results, no sign-up
Estimate jump height from flight time assuming equal takeoff and landing height.
For general information only. This is not medical advice, diagnosis, dosing guidance or a treatment recommendation. Talk to a doctor or other qualified health professional about your health, pregnancy, or diet.
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About the Jump Flight Time Calculator
The Jump Flight Time Calculator estimates vertical jump height from the time you spend airborne. It assumes your center of mass is at the same height at takeoff and landing, so matching your body position at those moments is essential. With the default flight time of 0.55 seconds, the estimated jump height is 37.08 cm.
- Flight time (seconds)
- The elapsed time from leaving the ground to first landing contact, measured in seconds, with a default of 0.55.
Formula and method
h = g × (t / 2)² / 2 = g × t² / 8; H = 100 × h. With t = 0.55 s and g = 9.80665 m/s²: H = 100 × 9.80665 × 0.55² / 8 = 37.08 cm, rounded to two decimal places.
- tTotal flight time in seconds.
- gStandard gravitational acceleration, taken as 9.80665 meters per second squared.
- hEstimated vertical rise of the center of mass above its takeoff height, in meters.
- HEstimated jump height in centimeters.
Assuming equal center-of-mass height at takeoff and landing, the calculator divides flight time equally between ascent and descent. It uses the ascent time and gravitational acceleration to calculate the vertical rise, converts meters to centimeters, and rounds the result to two decimal places.
Worked example
These are the calculator's starting values and the results it actually produces for them.
Inputs
- Flight time0.55 seconds
Results
- Estimated jump height37.08 cm
- NoteRequires matching body position at takeoff and landing.
How to use the Jump Flight Time Calculator
- 1Measure the airborne interval from takeoff to first landing contact using a suitable timing device or video.
- 2Check that the jump starts and ends on the same level surface and that body position is comparable at takeoff and landing.
- 3Enter the measured interval in Flight time (seconds), or leave the default value of 0.55.
- 4Read the estimated jump height; the default input produces 37.08 cm.
- 5Review the body-position note before comparing the estimate with other jumps.
Reading your result
Estimated jump height reports the modeled rise of your center of mass from takeoff to the highest point, not foot clearance or reach height. For a flight time of 0.55 seconds, this row reads 37.08 cm. The Note row states: Requires matching body position at takeoff and landing. This is an assumption to check, not a confirmation that your jump met it.
Limitations
The calculation assumes constant gravity, negligible air resistance, and equal center-of-mass height at takeoff and landing. Landing on the same surface alone does not guarantee this: changing leg, trunk, or arm position can alter center-of-mass height at contact. Tucking the legs or landing in a deeper crouch can lengthen measured flight time and overestimate jump height. Timing errors also affect the result because height depends on flight time squared. Two decimal places reflect output formatting, not guaranteed measurement accuracy. Do not change a safe landing technique merely to satisfy the model.
Common questions
Which part of the jump should I time?+
Time only the airborne interval, beginning when the feet leave the ground and ending at first landing contact. Do not include the preparatory crouch, push-off while still touching the ground, or movement after contact.
Why does the formula divide flight time by two?+
Under the equal-height assumption, the ascent and descent take the same amount of time. Half the total flight time is therefore the time from takeoff to the peak.
Can I use this calculator for a jump onto a box?+
Not reliably. A box landing generally places the center of mass at a different height than at takeoff, so ascent and descent times are not equal and the flight-time formula no longer applies.
Does 37.08 cm mean my feet cleared the ground by that amount?+
No. For the default flight time of 0.55 seconds, 37.08 cm estimates the rise of your center of mass. Foot clearance also depends on leg position, so lifting your knees can increase foot clearance without the same increase in center-of-mass rise.
Does the calculator save my information?+
Calculations run in your browser. While signed in, inputs and results are automatically recorded in account history; saving a result creates a separate saved record.
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Results are estimates for informational purposes and are not financial, medical or legal advice.