Free woodworking calculators
Five calculators for the arithmetic that sits between a design and a pile of timber: board feet, plywood sheets, shelf spacing, saw kerf and miter angles. Metric and imperial, results as you type.
No account, no email, no limits. Every one runs entirely in your browser — the numbers never leave your device, and the maths is the same deterministic arithmetic every time, not an estimate from a model.
Material & quantity
Work out how much stock to buy before you go to the timber yard.
Layout & spacing
Position parts inside a carcass and get the openings right.
Cutting & angles
Set the saw correctly and account for what the blade removes.
Where a calculator stops
Each of these answers one question in isolation. That is genuinely useful at the timber yard or standing at the saw, and for a lot of jobs it is all you need.
A complete project is a different problem. The shelf spacing depends on the carcass height, which depends on the material thickness; the shelf length depends on whether you are housing it in a dado, which changes the cut list; the sheet count depends on how those parts actually nest, not on their total area. Change one dimension and every one of those moves. That is the part these five tools cannot do for you, because each only sees its own inputs.
Plank CAD works the whole thing out together — parts, joinery allowances, a structural check and a nesting map derived from one description. It currently generates bookcases and open storage cabinets deterministically; other furniture types are not covered yet.
Your first blueprint is free.
No credit card required. 3 blueprints on signup. Cancel anytime.
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