Heads-up on reference frames: METAR wind is reported relative to TRUE north, while runway headings are MAGNETIC — use the wind from ATIS or tower (already magnetic), or apply the local magnetic variation before entering it here. The in-app AeroCopilot crosswind tool converts METAR winds to magnetic automatically.
The components above are computed from the SUSTAINED wind only. If the report carries a gust (for example 27012G22KT), enter it in the Gust field — the gust crosswind component is what has to be compared against your POH/AFM maximum demonstrated crosswind, and it can be far higher than the sustained one.
Why crosswind components matter
Every aircraft has a demonstrated crosswind component in its POH — the maximum crosswind the test pilot landed in during certification. For a Cessna 172, that is 15 knots. For a Piper Cherokee, it is 17 knots.
Understanding the actual crosswind component — not just raw wind speed — determines whether you can safely attempt the landing. A 20-knot wind 30 degrees off the runway is only a 10-knot crosswind. A 20-knot wind 90 degrees off the runway is a 20-knot crosswind.
This calculator uses standard trigonometry: crosswind = speed × sin(angle), headwind = speed × cos(angle). For in-flight recalculations, the AeroCopilot AI copilot pulls live METAR winds and calculates crosswind against your runway of intended landing.
Cite this
PermalinkAeroCopilot — Crosswind Calculator. https://www.aerocopilot.ai/tools/crosswind-calculator.