Online Tools

    Free Fall Calculator

    Calculate fall time, impact speed, height, gravity and optional drag estimates for free-fall scenarios.

    A negative value means upward initial velocity; for launch from ground level, use the thrown-upward mode.
    Fall time
    2.02 s
    Impact speed
    19.81 m/s
    71.3 km/h
    Kinetic energy
    196.13 J
    g
    9.807 m/s²
    Earth
    Solution
    From the entered height 20 m, the calculator finds a time of 2.02 s.
    Impact speed: 19.81 m/s.
    Kinetic energy for mass 1 kg: 196.13 J.
    Height over time, m
    Velocity over time, m/s
    ⚠ High speed and energy; this calculator does not estimate injuries or support real-world experiments
    Terminal speeds (Earth)
    Skydiver, free fall200 km/h
    Skydiver with parachute20 km/h
    Cat, high fall100 km/h
    Hailstone40 km/h
    Raindrop30 km/h
    Feather0.4 km/h

    Free fall under gravity

    Free-fall SERPs expect quick answers for height, time and impact speed, usually under the ideal no-air-resistance model with standard Earth gravity.

    t is fall time from rest, h is height and g is gravitational acceleration.

    v is impact speed in the ideal model.

    Air resistance caveat

    The drag mode is an estimate using a simplified constant-density model. It is not a safety, injury or skydiving planning tool.

    Frequently Asked Questions

    Sources and References

    Calculations are based on the listed reference sources. Links open in a new tab.

    Updated:

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