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Free tools

Wind tools that do the math for you.

Convert wind speeds, size your kite or wing, and check if today is worth the drive — free, in your browser, no signup. Built by the team behind the free WindUp live wind alarm.

Pick a tool

Three calculators every wind rider ends up needing.

Wind speed converter

Knots ⇄ mph ⇄ km/h ⇄ m/s with the Beaufort force alongside. The unit-soup fixer for forecasts, spot guides and gear charts.

Kite size calculator

Your weight + today's wind = the kite to pump. Twin-tip, surfboard and foil modes, with a gusty-day recommendation.

Wing size calculator

Wing foil sizing by weight, wind and level — from first taxi runs to pumping onto foil in 12 knots.
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Is it windy enough for your sport today?

Pick your sport, drag to today's forecast, and get a straight answer.

Use forecasts to plan ahead and nearby observations to check how conditions are developing. The WindUp app offers a free wind alarm for supported stations on iOS and Android.

Questions

Free tools FAQ

Are the WindUp wind tools really free?
Yes — every tool on this page runs free in your browser with no signup, no account and no paywall. They're built by the WindUp team, the same people who make the free live wind alarm, and they stay free for the same reason: riders shouldn't pay to know the wind.
How accurate are the kite and wing size calculators?
They use the same rule-of-thumb formulas instructors teach — rider weight times a constant, divided by wind speed in knots, adjusted for board or level. That gets you within one size for typical conditions. Brand design, gusts and water state shift the answer, so treat it as your starting size.
Do these tools work on my phone?
Yes. Use the calculators in a modern phone, tablet or desktop browser without installing an app. Load the page with an internet connection first. For station-based wind alerts, use the WindUp app.

Done calculating? Stop forecasting, start riding.

Choose a supported station and set your wind range in WindUp. Enable notifications and check your phone’s sound settings before relying on the alarm.

Download on the App Store Get it onGoogle Play

Free wind alarm · iOS & Android · Optional Pro features