Free Fall Calculator
Calculate how long an object takes to fall from a height, and how fast it is moving on impact, ignoring air resistance. Enter drop height to see…
8 of 8 free uses remaining today
Calculate how long an object takes to fall from a height, and how fast it is moving on impact, ignoring air resistance. Enter drop height to see fall time and impact speed when you calculate.
Worked example
Example calculated from the starting values. Enter your own values and press Calculate to get your result.
With the default inputs (drop height = 20 m), the results are: fall time 2.020 s; impact speed 19.806 m/s.
Quick reference: drop height vs result
Reference table based on the example values; it is not your calculation result.
| Drop height (m) | Fall time | Impact speed |
|---|---|---|
| 10 | 1.428 s | 14.005 m/s |
| 20 | 2.020 s | 19.806 m/s |
| 40 | 2.856 s | 28.009 m/s |
| 100 | 4.516 s | 44.287 m/s |
| 200 | 6.387 s | 62.631 m/s |
| 400 | 9.032 s | 88.574 m/s |
Frequently asked questions
What formula does this calculator use?
Fall time = sqrt(2 × h ÷ g); Impact speed = sqrt(2 × g × h). Variables: h = drop height in m. Fixed values: g = 9.80665.
What do I need to enter?
You need drop height (m). Results update as you type.
What is an example result?
With the default inputs (drop height = 20 m), the results are: fall time 2.020 s; impact speed 19.806 m/s.
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