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Found a figure that looks wrong, a formula you think is misapplied, or a hop, malt or yeast variety we're missing entirely? That's exactly the kind of message we want. Every number on this site is sourced, and a sourced number can still be wrong — a maltster updates a spec sheet, a hop grower revises a typical range, or we've simply made a transcription error.

We read every message. Corrections with a source (a maltster's own spec sheet, a manufacturer's product data sheet, a link to the current BJCP guideline PDF) get fixed fastest, since we can verify and update the figure directly rather than needing to track the source down ourselves first. General feedback, feature requests, and questions about how a specific calculator works are all welcome too — including "why did tool X give me this number," which is often the fastest way to catch a genuine bug in a formula's edge cases.