How it works
Estimate fall time and speed from rest with constant gravity and no air resistance. Real objects may behave differently.
t = √(2h/g); v = √(2gh)
Worked example
Show example inputs and result
Drop height: 20 · Gravity: 9.80665.
- Fall time
- 2.01961998 s
- Impact speed
- 19.80570625 m/s
Questions and answers
Why are some results rounded?
Results display up to 8 decimal places. Calculations use the unrounded values; very small values use scientific notation. JavaScript floating-point arithmetic can introduce tiny rounding differences.
Are my inputs sent to a server?
The calculator processes inputs in your browser. Its code does not send your values to a server.
Method reviewed: October 8, 2026 · Methods & accuracy