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Found a wrong number, a species with an unsourced figure, a calculator giving an answer that doesn't match your own hand math, or a broken link? Email us directly — a real person reads every message, and correction reports are prioritized over general feedback because an inaccurate figure on a woodworking reference site can genuinely cost someone material or time at the saw.

If you're reporting a possible error, include the page URL and, where relevant, the inputs you used in the calculator so the number can be reproduced and checked rather than guessed at.