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.

Distance (nm)

Distance still to fly.

Time to deadline (min)

Time remaining until the arrival deadline.

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

Required ground speed (kt)

Constant ground speed that exactly meets the deadline.

• 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.

• Estimated Trip Fuel Calculator

  Estimate the fuel needed for a trip from distance, ground speed, and fuel burn rate.

• ETA at Waypoint Calculator

  Estimate the clock time of arrival at a waypoint from a departure time, distance, and ground speed.

• Top of Descent Calculator

  Compute the distance before the target where a descent must begin for a given rate and ground speed.