Crosswind Calculator
Physics & EngineeringCalculate the crosswind and headwind or tailwind component for any runway from wind direction and speed. Free tool for pilots, with gust handling built in.
Crosswind Component
The wind component acting perpendicular to the runway.
Crosswind Direction
Left
Whether the crosswind is coming from the left or right.
Headwind / Tailwind Component
17.3 kt
The wind component acting along the runway. Positive is a headwind, negative is a tailwind.
Angle Between Wind and Runway
30
The angular difference between the wind direction and the runway heading, used in the calculation above.
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Physics & Engineering calculators
This calculator finds the crosswind and headwind or tailwind component acting on a runway from the wind direction, wind speed, and the runway you plan to use. Pick your runway number, enter the wind direction and speed straight from the ATIS or METAR, and it instantly shows the crosswind (labeled left or right), the headwind or tailwind, and the angle between the wind and the runway.
If gusts are reported, enter the gust speed too. The calculator plans around the higher of the two values, since that is the realistic worst case for a landing or takeoff, not the average.
This tool is a planning aid, not a substitute for your aircraft's actual Pilot's Operating Handbook or your own judgment as pilot in command. The maximum demonstrated crosswind component published in most aircraft manuals is a certification test value, not a regulatory limit, and only the pilot in command can decide whether conditions are safe for a given flight.
How the Crosswind Component Is Calculated
Every runway has a magnetic heading, and every reported wind has a direction it is blowing from. The angle between those two determines how much of the wind acts across the runway (crosswind) versus along it (headwind or tailwind). Multiplying the wind speed by the sine of that angle gives the crosswind component, and multiplying by the cosine gives the headwind or tailwind component.
For example, if the wind is blowing from 240 degrees and you are landing on Runway 27 (a heading of 270 degrees), the angle between them is 30 degrees. With a wind speed of 20 knots, the crosswind is 20 times the sine of 30 degrees, which is 10 knots from the left, and the headwind is 20 times the cosine of 30 degrees, which is about 17.3 knots.
A windsock gives you a rough visual read on wind direction and speed, but this calculator turns that into an exact crosswind number once you have a real wind reading from ATIS or METAR.
Using Gust Speed Instead of Steady Wind
A METAR reporting 18G25KT means the steady wind is 18 knots with gusts to 25 knots. For planning purposes, use the gust value, not the steady wind. The crosswind component during a gust is the realistic worst case you need to be prepared for during the actual landing or takeoff roll, not an average condition. Enter the gust speed in the Gust Speed field above and the calculator automatically uses whichever value, steady or gust, produces the higher result.
Quick Reference: Angle to Crosswind Percentage
This table shows what percentage of the total wind speed becomes crosswind versus headwind at common angles between the wind and the runway, useful for a fast mental estimate before you reach for the calculator.
| Angle | Crosswind % | Headwind % |
|---|---|---|
| 10° | 17% | 98% |
| 20° | 34% | 94% |
| 30° | 50% | 87% |
| 40° | 64% | 77% |
| 50° | 77% | 64% |
| 60° | 87% | 50% |
| 70° | 94% | 34% |
| 80° | 98% | 17% |
| 90° | 100% | 0% |
Why the Crosswind Component Matters
At an uncontrolled airport, no one selects the best runway for you. Checking the crosswind component for each available runway and picking the one with the lowest number is a routine part of preflight and in-flight planning. The same math applies to the Boat Speed Calculator for a vessel holding a compass heading against a crosswind, not just aircraft.
Wind also shifts between a departure briefing and an arrival, so recalculating before committing to an approach, using an updated ATIS reading, takes only a few seconds with this tool. A strong crosswind additionally pushes wake turbulence off the runway centerline faster, a real factor in spacing behind a heavier aircraft on the same runway.
Frequently Asked Questions
How is the crosswind component calculated?
Crosswind = Wind Speed times the sine of the angle between the wind direction and the runway heading, and Headwind/Tailwind = Wind Speed times the cosine of that same angle. This is standard trigonometric wind-component decomposition used throughout aviation.
What is a 20 knot wind at a 30 degree angle in crosswind terms?
A 20 knot wind at a 30 degree angle from the runway produces a crosswind of 10 knots and a headwind of about 17.3 knots, since sine of 30 degrees is 0.5 and cosine of 30 degrees is about 0.866.
Should I use the gust speed or the steady wind speed?
Use the gust speed for planning. If the METAR reads 18G25KT, calculate using 25 knots, since that is the realistic worst case during the landing or takeoff roll, not the average condition.
What does maximum demonstrated crosswind component mean?
It is the highest crosswind an aircraft was tested with during its certification, published in the Pilot's Operating Handbook. It is a certification reference value, not a hard regulatory limit, so exceeding it is legal but means the aircraft was never tested beyond that point.
Does the FAA set a specific crosswind limit in the regulations?
No. The Federal Aviation Regulations do not set a crosswind limit for standard Part 91 operations. The maximum demonstrated crosswind in the aircraft manual is advisory, and the pilot in command decides whether conditions are safe for a given flight.
How do I know if the crosswind is coming from the left or the right?
If the wind direction is a smaller number than the runway heading (within 180 degrees), the crosswind comes from the left. If it is a larger number, the crosswind comes from the right. This calculator labels the direction automatically.
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