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.

True airspeed (kt)

True airspeed through the airmass.

True course (°)

Intended track over the ground; any angle, normalized internally.

Wind speed (kt)

Sustained wind speed.

Wind from (°)

Direction the wind comes from in degrees true; any angle, normalized internally.

Solve the wind triangle for ground speed from true airspeed, course, and wind. 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 speed (kt)

Resulting ground speed along the course.

• 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.

• Ground Speed Calculator

  Compute ground speed from true airspeed and wind using the wind triangle.

• Groundspeed Corrected Calculator

  Compute ground speed from true airspeed with signed headwind and crosswind components.

• Groundspeed From Mach Calculator

  Compute true ground speed from Mach number and outside air temperature.