Learn how to calculate aircraft landing speed from weight, flap setting, VREF and wind, with the correct formula, worked example and common errors.
The correct aircraft landing speed is the manufacturer’s published VREF or final-approach speed for the expected landing weight and flap configuration, plus only approved wind and operational corrections. Fly the stated indicated airspeed, not groundspeed, and do not confuse stall speed, threshold speed or touchdown speed with the approach target.
In Aviation & Real-World Flying, “landing speed” is not one fixed number for an aircraft type. Weight, configuration and operating conditions change it from one landing to the next.
Which landing speed should I calculate?
The number normally needed on final approach is VAPP or the aircraft’s published final-approach speed. The terminology depends on the aircraft and its documentation.
- VREF is the manufacturer-defined reference landing speed, normally derived for a particular weight and landing configuration.
- VAPP is the speed actually targeted on approach after any required wind, gust, icing or operational correction has been applied.
- Touchdown speed is lower because the aircraft decelerates during the flare. It is rarely the number that should be held throughout final approach.
- Stall speed is not a normal approach target; the required operating margin has not yet been added.
Our explanation of how VREF and VAPP fit among aviation V-speeds covers these labels in more detail.
How do I calculate the correct landing speed?
Use aircraft-specific performance data rather than a generic speed formula whenever published information is available.
- Find the expected landing weight. Start with take-off weight, subtract fuel expected to be used, then account for any payload or fuel changes. In a simulator, check the weight actually loaded into the aircraft rather than relying on the flight-plan estimate. Our guide to working out aircraft weight and balance explains this input.
- Select the intended landing configuration. Choose the planned flap setting and identify any abnormal configuration, such as an inoperative flap system or required icing procedure.
- Read the base speed. Use the POH, AFM, approved performance table, aircraft computer, FMS or correctly modelled electronic flight bag. Select the row or calculated value matching the landing weight and configuration. The Fenix A320 landing-weight and VAPP process is a practical airliner example.
- Interpolate only where permitted. If the weight falls between two table entries, follow the document’s interpolation method. Do not extrapolate beyond the published weight range; use an approved calculator or the more restrictive published value instead.
- Apply specified corrections. Add only the wind, gust, icing, turbulence, equipment or configuration correction required by that aircraft’s procedure. Check whether an FMS-generated VAPP has already included the wind additive.
- Check the result. Confirm the units, flap setting, weight and speed limitations. Then verify that the runway length, surface, slope and wind permit the landing; a valid VREF does not by itself prove that the available runway is sufficient.
| Input | Typical effect |
|---|---|
| Higher landing weight | Raises the required reference speed |
| Reduced landing flap | Usually raises VREF and landing distance |
| Headwind or gust | May add to VAPP under the specified procedure |
| Tailwind | Raises groundspeed and distance; it does not justify reducing below minimum VREF |
| Icing or system failure | May require an additive, different configuration or both |
| High density altitude | Usually leaves the published indicated speed unchanged but raises true airspeed and landing distance |
Can landing speed be calculated from aircraft weight?
Only as an estimate when no validated aircraft table or calculator is available. For the same aircraft and configuration, a stall-derived reference speed changes approximately with the square root of weight:
Vnew = Vknown × √(Wnew / Wknown)
For example, if a reference speed is 120 knots at 60,000 kg, the estimated speed at 54,000 kg is:
120 × √(54,000 / 60,000) = 113.8 knots
That gives approximately 114 knots before any authorised approach correction. Both weights must use the same units, and full precision should be retained until the final rounding step.
This relationship does not account for flap changes, icing, centre-of-gravity effects, system failures or wind. It is useful for understanding and approximate simulator planning, but it does not replace approved performance data for real flight.
Can I multiply stall speed by 1.3?
Multiplying stall speed by 1.3 is not a universal method for calculating landing speed. Some reference speeds are defined using a margin above a recognised stall or minimum steady-flight speed, but the definitions, configuration and certification rules vary between aircraft.
A common mistake is using the clean stall speed when the published calculation uses a landing-configuration reference speed. Manufacturer data should always take priority over a homemade multiplier.
How does wind change the approach speed?
Wind normally changes VAPP rather than the underlying weight-and-configuration VREF. The exact additive varies by aircraft and operator, so there is no safe universal rule.
Some procedures use part of the steady headwind plus some or all of the gust increment, subject to minimum and maximum limits. Others calculate the additive automatically. Never add it twice, and do not subtract a tailwind from VREF merely to reduce groundspeed.
Temperature and altitude create another trap. Published approach speeds are normally flown as indicated airspeed, so pilots do not reduce the indicated target at a high-altitude airport. The corresponding true airspeed is higher, which means more groundspeed, flare distance and kinetic energy for the runway to absorb.
Why can a calculated landing speed still be wrong?
Most incorrect landing-speed calculations come from using the right method with the wrong input.
- Using take-off weight instead of expected landing weight.
- Selecting a full-flap table while planning a reduced-flap landing.
- Reading miles per hour as knots, or calibrated airspeed as indicated airspeed without checking the table heading.
- Flying groundspeed from a GPS display instead of indicated airspeed.
- Adding an arbitrary five or ten knots “for safety”, causing excessive float and a longer landing roll.
- Entering forecast wind into an FMS and then manually adding the same correction again.
- Assuming a simulator’s displayed V-speed has updated after changing fuel, payload or flap configuration.
What speed should I fly over the threshold?
Fly the aircraft’s published threshold or final-approach target, stabilised within the permitted tolerance, then allow speed to decay normally during the flare. Do not force the aircraft onto the runway while still holding the calculated approach speed.
The exact transition from VAPP to touchdown depends on aircraft type, wind and procedure. Once the target has been calculated, our guidance on controlling speed through approach, flare and touchdown explains how to use it without arriving fast or becoming unstable.