How to use the free fall calculator
Find fall time and impact speed for an object dropped from a height. Enter drop height, gravity in the fields above; the fall time, impact speed, impact speed are computed instantly and plotted on the chart so you can see how the answer changes.
Formula
Variables
- h — Drop height (m)
- gr — Gravity (m/s²)
Worked example
With drop height = 50 m, gravity = Earth, the calculator gives fall time ≈ 3.1933 s; impact speed ≈ 31.31557 m/s; impact speed ≈ 112.7361 km/h.
Frequently asked questions
What is the formula for the free fall calculation?
Fall time (s) = √(2 × h / gr). Impact speed (m/s) = gr × [Fall time]. Impact speed (km/h) = [Impact speed] × 3.6. Here h is drop height (m), gr is gravity (m/s²).
What inputs do I need for the free fall calculator?
You need drop height in m, gravity in m/s². Each field is pre-filled with a typical example so you can see how the result responds as you edit the numbers.
How do I use this calculator?
Type values into the input fields. Results and the chart update instantly. Use Reset to restore the example values, Copy results to paste them elsewhere, or Share to copy a link that preserves your inputs.
Is the result exact?
Calculations use standard formulas and double-precision arithmetic, then display about seven significant figures. Real-world measurements carry uncertainty, so treat results as estimates unless your inputs are exact.