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Send us feedback, corrections or suggestions. We read every message.
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Use the form below to report a calculation that looks wrong, suggest a new calculator or reference page, or ask a question about how a formula works. Include the runway heading, wind direction and speed you used if you're reporting a possible bug, so we can reproduce it.
What to include in a bug report
A precise bug report gets a faster fix. Tell us the page you were on, the exact inputs (runway heading, wind direction, wind speed and gust if relevant), the result the calculator showed, and the result you expected. If you're reporting a content error, quote the sentence or figure you think is wrong and, if you can, a source such as the FAA Pilot's Handbook of Aeronautical Knowledge or an aircraft's AFM/POH.