Free Fall Calculator
Fill in the value and the answer updates as you type.
How the Free Fall Calculator works
Ignoring air resistance: t = √(2h ÷ g) and v = √(2gh), with g = 9.80665 m/s².
Inputs and results
The Free Fall Calculator takes 1 input and gives 3 results.
What you enter
- Drop height (m) — starts at 20.
What you get
- Fall time (s)
- Impact speed (m/s)
- Impact speed (km/h)
Example: Free Fall Calculator with the starting values
With drop height 20 m, the calculator returns:
| Fall time (s) | 2.0196 |
|---|---|
| Impact speed (m/s) | 19.81 |
| Impact speed (km/h) | 71.3 |
Change any value above and the results update straight away.
Free Fall Calculator FAQ
How do I use the Free Fall Calculator?
Enter drop height in the fields, then read fall time (s), impact speed (m/s) and impact speed (km/h) in the result panel. The answer updates as you type, and you can press Calculate or Enter to refresh it. Use “Copy link” to share your exact numbers with someone else.
What does the Free Fall Calculator calculate?
Fall time and impact speed from a given height. It returns fall time (s), impact speed (m/s) and impact speed (km/h) from the 1 value you provide.
What values does the Free Fall Calculator start with?
It opens with drop height 20 m so you can see a working result straight away. Replace them with your own numbers, or press Reset to return to these starting values.
Is the Free Fall Calculator free and private?
Yes. It is free, needs no account, and runs in your browser, so nothing you type is sent to or stored on our servers. See the Privacy Policy for details.
Can I rely on the Free Fall Calculator for important decisions?
Treat the result as a well-rounded estimate. Real situations often have details a general calculator cannot know, so confirm important decisions with a qualified professional. See the Disclaimer for more.