GlenCalc

Free fall calculator

Dropped objects (from rest) in a vacuum; air resistance makes light objects fall more slowly.

Your answer

Fall time2.02 s
Impact speed19.806 m/s
In mph44.3 mph

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How we worked it out

Updated as you change the numbers.

  1. t = √(2h ÷ g); v = √(2gh); d = ½gt².

Method and assumptions

Uses standard gravity, 9.80665 m/s².

Questions

How long does it take to fall 20 m?

About 2.02 s, hitting at 19.8 m/s.

Sources

Method and figures checked on . Every worked answer on this page is covered by an automated test. Found a mistake? Tell us.

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