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.

Reference approach speed (kt)

Normal reference approach speed in smooth air.

Gust spread (kt)

Difference between gust and sustained wind speed.

Add half the reported gust spread to the reference approach speed for gusty conditions. 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]

Target approach speed (kt)

Adjusted target approach speed for the gusty day.

• 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.

• Vapp Speed Calculator

  Compute the final approach speed by adding a wind/gust correction to the reference speed.

• Best Glide Speed Calculator

  Compute the best glide speed for the current weight from a published reference.

• Groundspeed Required for ETA Calculator

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