About LumberMath
LumberMath is the yard arithmetic: board feet from dimensions, studs per wall, plywood sheets per floor, and what the lumber costs before the yard adds its surprises.
LumberMath exists because lumber is sold in nominal sizes that lie (a 2x4 is 1.5×3.5), priced in board feet nobody computes, and bought in quantities everyone under-estimates. The conversions are simple; having them done is the difference between one yard trip and two.
Every calculator on LumberMath shows its formula and its assumptions on the page, so you can check the math, reproduce it in a spreadsheet, or argue with it. Inputs are processed entirely in your browser — nothing is sent to a server, and there are no accounts.
LumberMath is an independent, ad-supported project. We are not affiliated with any lender, brand, agency, or the sources we cite (manufacturer coverage specs and industry rules of thumb). If a number looks wrong, the contact page reaches a human who fixes it.
What makes LumberMath different
- Your numbers never leave your browser. Every calculator on LumberMath runs entirely on your device. We never see, store, or transmit the figures you enter — there are no accounts and no server-side processing of your inputs.
- Published methodology. Each calculator page explains the exact formula it uses and the assumptions behind it, so you can check our work or reproduce it in a spreadsheet.
- Free, forever, without a paywall. LumberMath is supported by advertising. There is no premium tier, no email gate, and no upsell.
Independence
LumberMath is an independent educational project. We are not affiliated with, endorsed by, or acting on behalf of any government agency, lender, insurer, or the organizations whose formulas and public data we reference (such as manufacturer coverage specs and industry rules of thumb). All trademarks and referenced standards belong to their respective owners.
Questions, corrections, or suggestions are genuinely welcome — get in touch.