Support This Site

This site is free to use — every calculator, every species page, and every joinery and reference entry is available with no account, no paywall, and no required signup. Building and maintaining it takes real time: sourcing and verifying wood-movement coefficients against citable references, testing the calculator math against known cases, and writing joinery and reference content that's actually specific rather than generic.

Ways to help

If this site saved you a trip back to the lumberyard, prevented a cracked panel, or just made a project's math easier, a donation goes directly toward the time spent researching and maintaining the site — particularly the species and movement data, which is the material most likely to need periodic re-verification against updated published sources.

You can also support the site by purchasing the Shop Reference Pack, a printable PDF built for bench use, or simply by sharing a tool or reference page with someone who'd find it useful — a genuine recommendation costs nothing and helps just as much as a donation.

Where donations go

Donations support ongoing maintenance: keeping species and movement data current against published sources, expanding the joinery and reference libraries, and building out the remaining calculators. This isn't a subscription and carries no obligation — it's a way to say thanks if the site was genuinely useful to your project.