Science · Physics / Kinematics

Free Fall Calculator

Find the impact velocity, the drop distance or the fall time from any one input — with gravity selectable for Earth, the Moon, Mars and more.

Solve for:

Gravity g

v · velocity

h · distance

Drop from rest. Air resistance is ignored — real objects slow toward terminal velocity.

t · time

Solved value

v—

Equations of free fall (from rest)

v = gt h = ½gt² v² = 2gh

Starting from rest, velocity grows linearly with time while distance grows with the square of time: falling 1 s reaches 9.81 m/s after 4.9 m, but 3 s reaches 29.4 m/s after 44.1 m. The third form is handy when time is unknown: v = √(2gh).

🔢 Any input

Give velocity, distance or time and get the other two solved.

🌏 Other worlds

Switch gravity to the Moon, Mars, Jupiter or Titan in one click.

📈 Worked steps

See the rearranged formula with numbers substituted.

📚 Unit aware

m/s, ft/s, mph and metres or feet all convert automatically.

More physics & motion

Kinetic energy follows naturally once you know impact velocity.

Kinetic Energy Calculator