Crosswind Component Calculator
Resolve any reported wind into crosswind and headwind/tailwind components for your runway — with the side of the crosswind called out.
Quick gates: at 30° off the runway you get half the wind as crosswind; at 50° about three-quarters; at 90° all of it. The sign of the headwind flips to tailwind beyond 90°.
Formula
⚠️ For flight planning and education only — always verify against your aircraft's POH/AFM, official weather sources and certified instruments. Not for primary navigation or airworthiness decisions.
Disclaimer: This tool is for general informational and estimation purposes only and is not professional financial, tax, accounting or legal advice. All figures are estimates — verify with a qualified professional before making decisions. Read the full disclaimer.
Resolve any reported wind into crosswind and headwind/tailwind components for your runway — with the side of the crosswind called out.
About Crosswind Component Calculator
Every landing brief starts with the same trigonometry: how much of today's wind is trying to push you sideways, and how much is helping you slow down. This calculator resolves the reported wind against your runway heading into a crosswind component (with the side named — it matters for which wing goes down) and a signed headwind/tailwind component, plus the wind angle so the classic clock-rule approximations can be sanity-checked against the exact answer.
How to use Crosswind Component Calculator
- 1Enter — sensible defaults are pre-filled so you see a worked result immediately.
- 2Read the live results: .
- 3Check the "With your numbers" line to see the formula crosswind = W·sin(Δ); headwind = W·cos(Δ); Δ = |wind direction − runway heading| substituted step by step.
- 4Adjust inputs (or flip the unit toggle) until the scenario matches yours, then copy or share the result.
Why use Crosswind Component Calculator?
- ✓Instant, free and private — every calculation runs in your browser, nothing is uploaded
- ✓Built on the published formula crosswind = W·sin(Δ); headwind = W·cos(Δ); Δ = |wind direction − runway heading| with sources cited on the page
- ✓Quick gates: at 30° off the runway you get half the wind as crosswind; at 50° about three-quarters; at 90° all of it. The sign of the headwind flips to tailwind beyond 90°.
- ✓Switch units, tweak any input and watch every result update live
Frequently asked questions
Are ATIS winds magnetic or true, and does it matter here?+
Spoken winds — tower, ATIS, AWOS voice — are magnetic, matching runway numbers, so you can use both directly in this tool. Written METARs are true north. If you take wind from raw METAR text, convert with local variation first (or accept up to ~20° of error in high-variation regions like the Pacific Northwest).
What is the clock rule for crosswind?+
Treat the wind angle like minutes on a clock face: 15° off the nose = a quarter of the wind speed as crosswind, 30° = half, 45° = three-quarters, 60°+ = all of it. It deliberately over-estimates slightly versus the true sine. This tool computes the exact value so you can see how close the mental math lands.
Which component limits my landing — crosswind or tailwind?+
Both, differently. Crosswind is a controllability question: rudder authority to keep the nose straight and aileron to stop drift, captured in the demonstrated crosswind figure. Tailwind is a runway-length and certification question — most light aircraft are limited to 10 kt tailwind, and landing distance balloons quickly beyond a few knots.
Why does the tool report which side the crosswind is from?+
Technique and threats differ by side. The upwind wing (the side the wind comes from) carries the low wing in a sideslip landing; gust corrections, propeller P-factor on go-around and even runway lighting glare interact with wind side. 'A 12-knot crosswind from the left' is a complete briefing item; '12 knots' is not.
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