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.

New weight (lb)

Actual aircraft weight at the start of the roll.

Published Vr (kt)

Rotation speed from the pilot handbook.

Published weight (lb)

Weight at which rotation speed was published.

Scale the rotation speed for actual weight using the square-root weight ratio. 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]

Rotation speed (kt)

Rotation speed at the actual weight.

• 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.

• Stall Speed Weight Correction Calculator

  Scale a published stall speed for actual weight using the square-root weight ratio.

• Maneuvering Speed Va Calculator

  Scale the maneuvering speed for actual weight using the square-root weight ratio.

• Corrected IAS For Weight Calculator

  Correct an indicated airspeed for weight using the square-root weight ratio.