About this tool
Wind Correction Angle & Ground Speed Calculator is a free, in-browser tool that solves the wind triangle. Give it the course you want to make good, your true airspeed, and the wind (direction and speed), and it returns the heading to fly to hold that track plus the ground speed you will actually achieve — all computed locally.
The wind angle relative to course is converted to radians (degrees × π ÷ 180) before the trigonometry. The wind correction angle is WCA = arcsin(wind speed × sin(wind − course) ÷ TAS), the heading to fly is course + WCA, and ground speed is GS = TAS × cos(WCA) − wind speed × cos(wind − course). The tool also shows whether the along-track wind is a head- or tailwind. If the crosswind exceeds your true airspeed the course cannot be held and the tool says so instead of returning a bad number.
Use it for cross-country planning to work out the crab angle and time en route for each leg. It is an estimate for planning and study, not for real-world navigation, so verify headings, winds and ground speeds against official sources and your aircraft's instruments in flight.