EVERYDAY CLARITY
Free Fall Calculator
How long does an object dropped from rest take to fall this height? Enter the stated inputs to calculate this model.
Your result
Fall time
s
Impact speed
m/s
Result for the values shown.
Calculations run in your browser.
What to enter
| Input | Meaning and units |
|---|---|
| Drop height (m) | Enter drop height in m; use the same basis as the other measurements. |
| Gravity (m/s²) | Enter gravity in m/s²; use the same basis as the other measurements. |
Understanding your result
Read Fall time (s), Impact speed (m/s) in the units and model stated on this page. The formula time=sqrt(2*h/g) · speed=sqrt(2*g*h) defines the relationship; measurement accuracy and model applicability are separate from numerical precision.
Common mistakes
- Mixing input units or changing the physical meaning of a variable without changing the model.
Check your calculation
- Use the worked example as a known reference case, then change one input at a time and check the direction and units of the response.
Calculation checks, sources and review limits
How long does an object dropped from rest take to fall this height?
How long does an object dropped from rest take to fall this height? Enter the stated inputs to calculate this model.
Common uses
- How long does an object dropped from rest take to fall this height
How it works
time=sqrt(2*h/g); speed=sqrt(2*g*h)
Worked example
Enter Drop height: 20 m; Gravity: 10 m/s². Results: Fall time: 2 s; Impact speed: 20 m/s.