In-Flight Wind Calculator (From Drift & Ground Speed)
Invert the triangle: heading flown, track made and GPS ground speed in — the actual wind aloft out. Your aircraft is the wind probe.
Glass cockpits compute their wind arrow exactly this way, continuously. With a steady heading, an honest TAS and the GPS's track/GS, you get the real wind at your altitude — fresher than any forecast, exactly where you are.
Formula
⚠️ For flight planning and education only — verify with official sources and certified equipment. Not for primary navigation.
Invert the triangle: heading flown, track made and GPS ground speed in — the actual wind aloft out. Your aircraft is the wind probe.
About In-Flight Wind Calculator (From Drift & Ground Speed)
Forecast winds age; your airplane measures the real thing continuously, if you do the subtraction. Heading and TAS define the air vector; the GPS's track and ground speed define the ground vector; their difference is the wind — direction and speed, at your exact altitude and position, right now. This calculator performs the vector arithmetic glass cockpits run silently, available to any pilot with a compass, an airspeed indicator and a phone GPS.
How to use In-Flight Wind Calculator (From Drift & Ground Speed)
- 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 wind vector = air vector (HDG, TAS) − ground vector (TRK, GS) — solved as components substituted step by step.
- 4Adjust inputs (or flip the unit toggle) until the scenario matches yours, then copy or share the result.
Why use In-Flight Wind Calculator (From Drift & Ground Speed)?
- ✓Instant, free and private — every calculation runs in your browser, nothing is uploaded
- ✓Built on the published formula wind vector = air vector (HDG, TAS) − ground vector (TRK, GS) — solved as components with sources cited on the page
- ✓Glass cockpits compute their wind arrow exactly this way, continuously. With a steady heading, an honest TAS and the GPS's track/GS, you get the real wind at your altitude — fresher than any forecast, exactly where you are.
- ✓Switch units, tweak any input and watch every result update live
Frequently asked questions
How steady must my flying be for a good wind solution?+
Ten seconds of honest discipline: constant heading (±2°), constant altitude and airspeed, then note track and GS together. Turning or accelerating during the sample corrupts the air vector. Autopilot heading mode makes it trivial; hand-flying, sample during the calm moments. Two samples five minutes apart that agree are confirmation; that disagree, shear.
Which inputs limit the accuracy?+
TAS and heading, in that order: GPS track/GS are near-perfect, but a 3° compass error or 5-kt TAS error appears directly in the wind solution. Use the calibrated heading (deviation card applied) and a real TAS (our TAS tools, or the glass PFD's value). With clean inputs, the wind resolves to ±2 kt and ±10°.
What can I do with the measured wind?+
Refine everything downstream: re-run the navlog heading for the next leg, update the ETA and fuel math with the real component, choose a better altitude (sample during climb and you've profiled the wind), and report it — a PIREP with measured winds is gold to following pilots and forecasters alike.
Why does my measured wind differ from the winds-aloft forecast?+
Forecast grids interpolate over space and hours; you measured one point, now. Differences of 10–20° and 10 kt are routine and usually mean the forecast timing is off, not broken. Large persistent differences signal a shifted weather feature — fronts and jet positions move — which is precisely the early intelligence en-route wind sampling exists to give you.
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