Calculate the time required for an object to fall a certain distance under gravity.
Fall Parameters
Calculation Results
Enter parameters to calculate fall time
Quick Reference
tTime (seconds)
dDistance (meters)
v₀Initial velocity (m/s)
g9.81 m/s² (Earth gravity)
vv = v₀ + gt (Final velocity)
Overview
Free fall time is calculated by rearranging the kinematic equation: t = √(2d/g) for objects starting from rest, or using the quadratic formula for objects with initial velocity. Time increases with the square root of distance.
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Pro Tips
For objects dropped from rest (v₀ = 0), time depends only on distance and gravity.
The relationship is not linear - doubling the distance increases time by √2 (about 1.41x).
Terminal velocity limits actual fall times in real-world scenarios with air resistance.
Gravity varies slightly by location (9.78-9.83 m/s²), affecting precise calculations.
Reaction time (about 0.2 seconds) affects perceived fall time in human activities.
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Fun Facts
"A penny dropped from the Empire State Building reaches only 65 mph, not enough to be dangerous."
"The fastest skydive speed record is 373.6 mph (601.1 km/h) by Felix Baumgartner in 2012."
"Free fall time from 10,000 feet is about 30 seconds without a parachute."
"Olympic ski jumpers spend about 4-5 seconds in free fall during their jumps."
"The longest free fall time with a parachute is over 4 minutes from 130,000 feet."
