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.

Altitude to lose (ft)

Altitude to lose.

Descent rate (ft/min)

Sustained vertical speed during the descent.

Compute the minutes needed to descend an altitude at a given vertical speed. 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]

Time (min)

Time required for the descent.

• 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.

• Descent Rate Calculator

  Compute the vertical speed needed to hold a descent angle at a given ground speed.

• Time to Climb Calculator

  Compute the time needed to climb a given altitude at a sustained climb rate.

• Time to Top of Climb Calculator

  Compute the time in minutes to climb from the current altitude to a target altitude at a given rate of climb.