Calculate crosswind, headwind, and tailwind components from wind speed and the angle to the runway. Use it to quickly see how much of the wind acts across the runway and how much acts along it.
Last updated: March 2026 | By Summa Calculator
crosswind = wind speed × sin(angle)
headwind or tailwind = wind speed × cos(angle)
Crosswind is the part of the wind that blows across your direction of travel. In aviation, it is the sideways wind component relative to the runway. The remaining part of the wind acts along the runway as either a headwind or a tailwind.
When wind doesn't blow directly down or against the runway, it has two components: the crosswind component (perpendicular to the runway) and the headwind or tailwind component (parallel to the runway). The crosswind component is calculated using trigonometry: Crosswind = Wind Speed × sin(Wind Angle). The headwind/tailwind component is: Headwind = Wind Speed × cos(Wind Angle).
— Every aircraft has a demonstrated crosswind limit the maximum crosswind in which the aircraft was tested during certification. For small general aviation aircraft, this is typically 15-20 knots. Larger commercial aircraft can handle 30-40 knots. However, these are demonstrated limits, not absolute maximums. Pilots must consider their personal limits, runway conditions (wet/icy surfaces reduce crosswind capability), and passenger comfort when operating in crosswinds.
Enter the reported wind speed. You can choose knots (standard aviation), mph, or kph. METAR reports and ATIS broadcasts typically use knots.
Calculate the angle between the wind direction and runway heading. For example, if the runway is 090° and wind is from 120°, the angle is 30°. Range: 0° (direct headwind) to 180° (direct tailwind).
The calculator shows crosswind component (affects lateral control) and headwind/tailwind component (affects takeoff/landing distance). Check these against your aircraft's limits.
Landing on runway 27 (270°) with wind from 300° at 20 knots:
Subtract the runway heading from the wind direction. For runway 27 (270°) with wind from 300°, the angle is 30°. If the result is greater than 180°, subtract from 360° to get the acute angle.
Demonstrated crosswind is the highest wind in which the aircraft was tested during certification. It's not a legal limit, aircraft can often operate in higher crosswinds, but it requires exceptional skill and favorable conditions.
Crosswind requires pilots to 'crab' (point the nose into the wind) or use wing-low technique to maintain runway alignment. It demands constant corrections and can cause side loads on landing gear if not handled properly.
Gusting wind effectively reduces your crosswind capability. If wind is 15 gusting 25 knots, you should plan for 25 knots. The sudden changes require rapid control inputs and increase landing difficulty significantly.
No, the crosswind component is independent of whether the wind has a headwind or tailwind component. A 20-knot wind at 45° has 14.1 knots crosswind regardless of whether it's quartering headwind or tailwind.
Multiply wind speed by the sine of the angle between the wind direction and the runway direction.
Multiply wind speed by the cosine of the angle between the wind direction and the runway direction. A positive result is headwind, and a negative result is tailwind.
Multiple runways at different headings allow aircraft to take off and land more closely aligned with the wind, reducing crosswind. Controllers assign runways based on wind to keep crosswind within safe limits.
Crosswind is generally more challenging during landing because you're slower, closer to the ground, and have less energy and altitude to recover from errors. Takeoff has more energy and time to correct.
Two main techniques: crab method (point nose into wind, kick straight before touchdown) or wing-low method (lower upwind wing, opposite rudder to maintain centerline). Many pilots use a combination.
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