About WoodCalc

WoodCalc is a free set of calculators for people who plan their own wood projects — the homeowner measuring a wall before buying studs, the hobbyist cutting a first set of cabinet doors, the weekend warrior pricing a deck before calling a contractor.

Why this site exists

Almost every material-sizing mistake in woodworking comes from one place: nominal lumber sizes. A "1×6" board is actually ¾ inch by 5½ inches. A "2×4" is 1½ by 3½. Any calculator built on the nominal name overstates coverage by 8 to 9 percent, and over a whole project that difference is dozens of boards and a second trip to the lumber yard.

WoodCalc was built on a simple rule: every calculation runs on real milled dimensions, and results are rounded up to units you can actually buy. You cannot purchase half a bag of concrete. A number that does not tell you what to put in the cart is not a useful number.

What you'll find here

• Material calculators — board feet, lumber waste, deck boards and full deck material bundles, plywood sheets, wall studs, joist spans, hardwood flooring, paint coverage, fence materials, roof pitch, rafter lengths, stair stringers, miter angles, dowel layout, screw quantities, log yield, firewood volume, and shop dust collection.
• Reference charts — nominal vs actual lumber dimensions, joist span tables, board foot pricing factors, fastener charts, and species weight data.
• Guides — practical explainers on waste factors, deck planning, plywood grades, and choosing tools.

How we handle the details

Code and safety. Calculators that touch structural work — joist spans, deck framing, stairs — show the standard referenced value and state plainly when a plan does not pass. They are estimating references, not engineering. Anything load-bearing should be confirmed by a local building official or a structural engineer, and permitted where required.

Units. North American construction is imperial, so output is imperial first. Paint and firewood also convert to metric, because a surprising share of DIY search traffic comes from outside the US.

No accounts, no tracking of your numbers. Every tool runs entirely in your browser. Nothing you type is sent anywhere or stored.

How WoodCalc is funded

WoodCalc is free to use and funded by affiliate commissions. When you buy something through a link on this site, we may receive a small commission at no extra cost to you. It never changes the numbers in a calculator and never affects which tool or product we recommend. Our full affiliate disclosure lists every partner.

Corrections

Estimating formulas get revised as lumber standards and building codes change. If you find a number that is wrong, we want to know — tell us and we will fix it. Correct material math is the only reason this site exists.

Contact

Questions, corrections, or a project you would like a calculator for: get in touch.