What is the Free Fall Calculator?
Calculate the time and impact speed of an object dropped from a height.
Enter height and gravity and the Free Fall Calculator returns time to fall, impact speed and impact speed in km/h. Results update as you type, and nothing you enter leaves your device.
How it is calculated
t = √(2h ÷ g)
v = √(2gh)
Air resistance is ignored.
How to use it
- Enter height in m.
- Enter gravity in m/s².
- Read time to fall in the results panel. It updates as you type.
- Change any value to compare scenarios, or use Share to send the result as a link.
Worked example
Common questions
What formula does the Free Fall Calculator use?
It uses: t = √(2h ÷ g); v = √(2gh).
What do I need to use the Free Fall Calculator?
You need height and gravity. Sensible starting values are filled in so you can see how it works straight away.
Is the Free Fall Calculator free, and is my data stored?
It is free with no sign-up. The calculation runs in your browser, so the values you enter are not sent to or stored on our server.