Science calculator
Free Fall Calculator
Calculate velocity and time for an object in free fall.
About the free fall calculator
The free fall calculator finds the time and impact velocity for an object dropped from a height.
How to use this calculator
- 1
Enter height
Enter the drop height in meters.
- 2
Enter gravity
Enter gravitational acceleration (9.81 m/s² for Earth by default).
- 3
View results
See fall time and impact velocity.
How the calculation works
Time = √(2h/g). Velocity = √(2gh). Assumes no air resistance.
Example: 10m fall: time≈1.43s, velocity≈14m/s.
Understanding scientific constants
Key constants used: g = 9.81 m/s² (Earth gravity), c = 299,792,458 m/s (speed of light), G = 6.674×10⁻¹¹ N·m²/kg² (gravitational constant), h = 6.626×10⁻³⁴ J·s (Planck's constant), R = 8.314 J/(mol·K) (ideal gas constant). Results assume ideal conditions — real-world measurements may vary.
Ideal vs. real-world conditions
Most physics calculators assume ideal conditions: no air resistance, perfect vacuums, uniform gravity. Real-world results will differ due to friction, air resistance, temperature variations, and measurement uncertainty. Use these tools for learning and estimation, not precision engineering.
Important limitations
This tool provides a mathematical estimate based only on the values entered. It does not account for regulations, taxes, lender fees, market conditions, or individual circumstances. Results are for planning purposes only — consult a qualified professional for regulated, medical, financial, or construction decisions.
Frequently asked questions about free fall calculator
How accurate is the free fall calculator?+
The calculation follows the displayed formula and retains full numeric precision before formatting the result.
Can I use the result professionally?+
Use it as a planning estimate. Confirm regulated, medical, financial, or construction decisions with a qualified professional.