Sailing Wind Calculator

Calculate apparent wind angle and speed from true wind conditions and boat speed. Determine your velocity made good (VMG) toward the wind.

True Wind Speed

kts

True Wind Angle

Boat Speed

kts

Tab to move between fields

Apparent Wind Speed

19.7 kts

Apparent Wind Angle32.6°

Velocity Made Good4.24 kts

How to Use This Calculator

Enter the true wind speed in knots from a weather station or instrument.
Set the true wind angle in degrees — 0° is directly into the wind, 90° is a beam reach, 180° is a dead run.
Enter your current boat speed in knots.
Read Apparent Wind Speed (AWS) in knots — this is what your wind instruments and sails respond to.
Check Apparent Wind Angle (AWA) to know how to trim your sails for the actual wind your boat is experiencing.
Use Velocity Made Good (VMG) in knots to evaluate how efficiently you are making progress toward an upwind or downwind mark.

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