Free Fall Time Calculator: t = √(2h/g)

The Free Fall Time Calculator computes time of fall from a height using t = √(2h/g). Enter height in meters or feet, adjust gravity if needed, and get time in seconds with detailed working. Compare with the Free Fall Calculator for velocity and distance, or use the Velocity Calculator to explore motion changes after impact.

How to Use

Enter height: Input drop height in meters or feet.
Set gravity: Use 9.81 m/s² for Earth or customize.
Calculate: Click Calculate to get time in seconds.
Review steps: See the formula application and conversions.
Reset: Clear inputs to run another scenario.

Core Formula

t = \sqrt{\frac{2h}{g}}

Time depends on height h and gravitational acceleration g assuming zero initial velocity.

Increase height → longer fall time
Higher gravity → shorter fall time
Assumes no air resistance and zero initial velocity

Applications

Physics labs estimating drop times
Engineering safety timing for drops
STEM education demonstrations
Quick gravity comparisons (Earth vs. Moon)
Sports and motion timing scenarios

Can I change gravity?

Yes. Set g to 9.81 m/s² for Earth or adjust for Moon, Mars, or custom tests.

Does this include air resistance?

No. It assumes ideal free fall with zero drag and zero initial velocity.

Which units are supported?

Height in meters or feet; time output in seconds.

Free Fall Time Calculator