Use this calculator for flight-planning study or a first-pass cross-check when all inputs describe the same aircraft, atmospheric condition, and phase of flight.

Liftoff speed (kt)

Speed at which the wheels leave the runway.

Acceleration (g)

Average forward acceleration during the roll, in g.

Compute the takeoff ground roll from the liftoff speed and average forward acceleration using constant-acceleration kinematics. The tool evaluates the supplied inputs together and returns the named outputs below; it does not infer omitted operating conditions or change the units shown.^[1]

Ground roll (m)

Runway distance used for the roll.

• Do not use a generic calculator in place of the current aircraft flight manual, approved performance data, operating limitations, NOTAMs, weather, or regulations. Real performance changes with configuration, runway condition, altitude, temperature, wind, loading, and technique.
• Use finite inputs in the displayed units and preserve more precision than the final presentation requires. Independently verify safety-critical, financial, compliance, or production decisions.

Cross-check the result against the aircraft flight manual or approved planning system, then apply the required safety margins. Keep signed wind, heading, altitude, speed, and fuel conventions explicit.

• Landing Ground Roll Calculator

  Compute the landing ground roll from the touchdown speed and average braking deceleration using constant-deceleration kinematics.

• Groundspeed Required for ETA Calculator

  Compute the constant ground speed needed to cover a distance before a deadline.

• Crosswind Takeoff Check

  Resolve wind speed into an absolute crosswind component relative to runway heading and compare it with a user-supplied aircraft or pilot limit. This checks only the wind component, not runway condition or takeoff performance.