Free Fall Calculator
Free fall calculator
Estimate fall time and impact velocity from drop height with optional initial velocity.
Result
t = 3.02942997 s
Impact velocity = 29.70855937 m/s.
Physics signal
Advanced options
Flow
- Enter drop height and gravitational acceleration.
- Optionally enter initial downward velocity.
- Read time to impact and final velocity.
Example
Worked example: h = 45 m, g = 9.80665 m/s^2, u = 0
- 1 Solve h = 1/2gt^2 for t.
- 2 Use t to compute v = gt.
- 3 Report both time and impact speed.
Time is about 3.03 s and impact speed about 29.7 m/s.
How
- Enter drop height and gravitational acceleration.
- Optionally enter initial downward velocity.
- Read time to impact and final velocity.
Avoid
- Entering negative height for downward drop problems.
- Using non-SI gravity units without conversion.
Checks
Best fit
Free Fall Calculator is built for estimate free-fall time and impact velocity from drop height and gravity. If Free Fall Calculator does not match the input scope, compare the answer with a second method.
Input check
Match the entered values to this rule before copying the answer: h = ut + 1/2 gt^2, v = u + gt.
Sanity check
For Free Fall Calculator, use the worked example as a quick benchmark: Time is about 3.03 s and impact speed about 29.7 m/s. If the free fall calculator answer is far away, check whether an input, unit, or mode changed.
Before copying
Review this common issue first: entering negative height for downward drop problems.
FAQ
Does this model air resistance?
No. It assumes ideal free-fall without drag.
Can I change gravity?
Yes. Enter alternate gravity for other planets or test conditions.
Can initial velocity be non-zero?
Yes. Provide downward initial velocity in the same unit system.
Switch
Switch12
No match.