Calculator inputs
Use the responsive grid below: three columns on large screens, two on smaller screens, and one on mobile devices.
Example data table
These sample routes show how different wind conditions shift heading, ground speed, and estimated en route time.
| Case | Course (°) | TAS (kt) | Wind From (°) | Wind (kt) | WCA (°) | True Heading (°) | Ground Speed (kt) | ETE (hr) |
|---|---|---|---|---|---|---|---|---|
| 1 | 90 | 120 | 45 | 18 | -6.09 | 83.91 | 106.60 | 2.35 |
| 2 | 180 | 135 | 210 | 24 | 5.10 | 185.10 | 113.68 | 1.58 |
| 3 | 315 | 110 | 270 | 30 | -11.12 | 303.88 | 86.72 | 1.10 |
| 4 | 25 | 160 | 80 | 40 | 11.82 | 36.82 | 133.67 | 3.14 |
Formula used
This calculator applies the wind triangle. Wind direction is entered as the direction the wind blows from, which matches common aviation weather reporting.
If crosswind exceeds true airspeed, an exact track hold is not possible, so the calculator flags the condition and still shows the constrained geometry.
How to use this calculator
- Enter the intended true course in degrees.
- Add aircraft true airspeed in knots.
- Enter wind direction as the reported direction from which it blows.
- Type the wind speed in knots.
- Provide route distance and fuel burn for trip estimates.
- Enter magnetic variation using east positive and west negative values.
- Press the calculate button to place results above the form.
- Review the cards, graph, exports, and interpretation summary.
Frequently asked questions
1. What is wind correction angle?
Wind correction angle is the heading adjustment needed to offset crosswind drift. It keeps the aircraft on the desired ground track rather than letting wind push it sideways.
2. Why can ground speed differ from airspeed?
Airspeed measures motion through the air mass. Ground speed measures motion over Earth. Headwinds reduce ground speed, while tailwinds increase it, even when true airspeed stays unchanged.
3. Should wind direction be entered as from or to?
Enter the direction the wind blows from. That matches standard weather reports and aviation convention. A wind from 270 means air moves toward 090.
4. What happens when crosswind exceeds true airspeed?
The requested track becomes impossible to hold exactly because the aircraft cannot generate enough sideways correction. The calculator warns you when this wind triangle condition occurs.
5. Why include magnetic variation?
Pilots often fly magnetic headings, while many planning calculations start with true course. Variation converts the corrected true heading into a usable magnetic heading for navigation.
6. Can I use this for flight planning practice?
Yes. It works well for navigation exercises, dispatch checks, and classroom demonstrations. Real flights should still use current weather, aircraft performance data, and official procedures.
7. How accurate is the fuel estimate?
Fuel use depends on the burn rate you enter and the calculated en route time. It is a planning estimate only and does not replace aircraft-specific performance tables.
8. Why does the graph use wind angle?
Wind angle helps visualize how the same wind speed changes performance as its direction shifts from pure headwind to crosswind and then toward tailwind conditions.