Wind Correction Angle Calculator
Calculate the wind correction angle (WCA), true heading, groundspeed, and estimated time enroute from your true course, true airspeed, and wind data. Optionally enter a distance to get ETE.
Why This Matters to Pilots
Wind correction is fundamental to cross-country navigation. Without correcting for wind, an aircraft will drift off course, potentially into restricted airspace or terrain. The wind correction angle tells you how many degrees to "crab" into the wind to maintain your desired track.
Groundspeed directly affects fuel burn and time enroute. A strong headwind can significantly increase flight time and fuel consumption, potentially requiring an alternate plan or fuel stop.
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Frequently Asked Questions
This calculator is for educational and planning purposes only. Always refer to your aircraft's POH/AFM, current NOTAMs, and official weather briefings. No calculator is a substitute for pilot-in-command judgment or CFI guidance. Read our full Safety Disclaimer.
Last reviewed: July 2026
Wind Correction Angle in Depth
The wind correction angle is the amount you must turn the aircraft's nose into the wind to make its path over the ground follow your intended course. Because air moves, an aircraft pointed straight at a distant checkpoint in a crosswind will drift steadily to one side; the correction angle, sometimes called the crab angle, is the deliberate offset that cancels that drift. Mastering it is the difference between arriving over your checkpoints and slowly wandering off course.
This concept underlies all wind-triangle navigation. The heading you fly, the course you track, and the wind form a triangle, and the correction angle is the angle between heading and course. A pilot who understands it intuitively can anticipate which way to crab, how the correction grows with wind speed, and why the same wind that helps on one leg hurts on the reciprocal.
Step-by-Step: How the Calculation Works
The correction angle depends on the crosswind component and the true airspeed. Only the portion of the wind blowing across your course — the crosswind component — causes drift; the along-course portion changes groundspeed instead. The correction angle is found from the ratio of the crosswind component to the true airspeed, larger when the crosswind is strong or the aircraft is slow, and smaller when the aircraft is fast.
In practice you resolve the wind into components relative to your course, take the crosswind part, and compute the angle whose sine equals that crosswind divided by true airspeed. The calculator does this trigonometry for you, but the useful mental model is that a crosswind equal to about one-sixth of your true airspeed needs roughly a ten-degree correction, scaling up from there.
More Worked Examples
Example 1 — A moderate crosswind
True airspeed 110 knots, wind giving a 20-knot crosswind component from the right. The correction angle is about arcsine(20/110), or roughly 10 degrees. You turn the nose 10 degrees right of course so the aircraft crabs into the wind and tracks straight toward the checkpoint.
Example 2 — Slower aircraft, same wind
The same 20-knot crosswind component now acts on a 70-knot true airspeed. The correction angle grows to about arcsine(20/70), near 17 degrees, showing why slow aircraft crab more steeply and why light trainers are more affected by wind than faster airplanes.
Pilot Decision-Making Context
Knowing the correction angle before departure lets you preset a heading and verify your tracking against ground features rather than chasing the course reactively. If your computed heading and the actual drift disagree, the wind aloft differs from the forecast, which is itself valuable information for the rest of the flight and for fuel planning.
The correction angle also sets expectations for the approach and landing. A crab that felt small en route can become a demanding crosswind on final, so a large correction angle in cruise is an early warning to review the destination winds and confirm they are within your and the aircraft's crosswind limits before you arrive.
More Questions Answered
Does a headwind require a correction angle?
A pure headwind or tailwind requires no correction angle; it only changes groundspeed. Correction angle is driven solely by the crosswind component blowing across your course.
Why do slower aircraft need larger correction angles?
Because the correction depends on the ratio of crosswind to true airspeed. The same crosswind is a larger fraction of a slow aircraft's speed, so it demands a larger crab to counter the drift.
Is crab angle the same as the wind correction angle?
Yes. In cruise navigation the terms are used interchangeably for the angle between your heading and your intended course that cancels wind drift.
How do I verify my correction angle is right in flight?
Pick a distant landmark on your course and watch whether it stays fixed in the windscreen. If it drifts steadily to one side, you are under-correcting into the wind and should increase the crab; once the landmark holds its position, your correction angle matches the actual wind.
Does the wind correction angle change on the return leg?
Yes. Flying the reciprocal course reverses which side the crosswind strikes, so the correction is applied in the opposite direction, and a headwind on the outbound leg becomes a tailwind on the way back, changing your groundspeed and timing as well.
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