Best Runway Selector (Wind Components for Two Runways)
Enter the wind once and two runway options — get all four components side by side and the better runway called.
Selection logic mirrors what towers do: never accept a tailwind when an into-wind runway exists, then minimize crosswind. Noise, traffic flow and runway length can override — aerodynamics proposes, operations disposes.
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.
Enter the wind once and two runway options — get all four components side by side and the better runway called.
About Best Runway Selector (Wind Components for Two Runways)
At uncontrolled fields the runway decision is yours, and a wind that splits the difference between two runways makes pattern radio calls contentious. This selector computes crosswind and headwind/tailwind for both candidate runways from a single wind entry and applies the same logic ATC uses: an into-wind runway beats one with any tailwind, and among headwind options the smaller crosswind wins. All four components stay visible so you can overrule it with judgment.
How to use Best Runway Selector (Wind Components for Two Runways)
- 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 for each runway: Δ = wind − 10×RWY; pick headwind first, then least crosswind substituted step by step.
- 4Adjust inputs (or flip the unit toggle) until the scenario matches yours, then copy or share the result.
Why use Best Runway Selector (Wind Components for Two Runways)?
- ✓Instant, free and private — every calculation runs in your browser, nothing is uploaded
- ✓Built on the published formula for each runway: Δ = wind − 10×RWY; pick headwind first, then least crosswind with sources cited on the page
- ✓Selection logic mirrors what towers do: never accept a tailwind when an into-wind runway exists, then minimize crosswind. Noise, traffic flow and runway length can override — aerodynamics proposes, operations disposes.
- ✓Switch units, tweak any input and watch every result update live
Frequently asked questions
How do I read runway numbers into headings?+
Multiply by ten: runway 17 points 170° magnetic, runway 26 points 260°. The same strip is both numbers, one each direction (17/35, 8/26). This tool takes the number and does the ×10 internally — enter 17 and 26 to compare the two ends or two different strips at once.
Why is even a small tailwind treated as disqualifying?+
Tailwind inflates ground speed at touchdown, and landing distance grows with ground speed squared — a mere 5-kt tailwind adds roughly 10%+ to the roll, more for fast approaches. Most POHs cap operations at 10 kt tailwind. The FAA's controller handbook orders runways 'most nearly aligned with the wind' when wind is 5 knots or more for the same reason.
The calm-wind runway differs from the tool's pick — which wins?+
Below about 5 knots of wind, published calm-wind runway conventions, traffic already in the pattern, noise abatement and obstacle/lighting considerations legitimately outrank a one-knot component difference. This tool tells you what the air prefers; the airport's operational context tells you what the day requires. Blend both.
Can I use this for intersecting runways at a towered field?+
As situational awareness, yes — it explains why the tower is using the runway it is, and arms you to request the other when components genuinely favor it (especially relevant for light taildraggers when the jets' runway carries a punishing crosswind for you). The tower's assignment remains controlling unless you state unable.
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