Crosswind Calculator
Enter the wind direction and speed, and the runway heading, to get the crosswind and headwind/tailwind component - the same go/no-go check you'd do before any lesson.
How to calculate crosswind by hand
The formula behind the calculator above - useful to know for your written exam, or for a quick mental estimate before you even open a calculator.
Crosswind component = wind speed × sin(wind angle), where the wind angle is the difference between the wind direction and the runway heading.
Worked example: runway 09 (a heading of 090°), wind from 150° at 20kt. The wind angle is 150 − 90 = 60°. sin(60°) ≈ 0.87, so the crosswind component is 20 × 0.87 ≈ 17kt. The headwind component (the same calculation with cosine instead of sine) is 20 × cos(60°) = 10kt.
A couple of mental shortcuts flying schools teach: at a 30° wind angle, the crosswind component is about half the wind speed; at 45°, it's about 70% of the wind speed; by 60° or more, treat it as the full wind speed for a quick, conservative estimate.
Frequently asked questions
What is crosswind component?
Crosswind component is the part of the wind blowing across a runway rather than along it - the part that pushes an aircraft sideways during takeoff and landing. It's calculated from the angle between the wind direction and the runway heading, not the full wind speed.
What is a safe crosswind for a student pilot?
It depends entirely on the aircraft and the pilot's experience - every aircraft's Pilot's Operating Handbook (POH) states a maximum demonstrated crosswind component, and most flying schools set their own, more conservative limit for students. Always check your aircraft's POH and your instructor's guidance rather than a general rule.
What's the difference between crosswind and headwind component?
They're the two components a wind splits into relative to a runway: headwind (or tailwind) is the part blowing straight down the runway, and crosswind is the part blowing across it. A wind exactly down the runway is all headwind and no crosswind; a wind exactly across it is the reverse.
Does it matter which end of the runway I use?
Not for the crosswind component itself - a runway is a single physical line, so the crosswind component is the same magnitude from either end. Which end you're actually taking off/landing from only changes whether it's a headwind or a tailwind component.