Calculators for weekend projects

Simple, accurate project math — answers update as you type. No account, no popups, nothing between you and the number you came for.

Why these calculators?

Most project calculators bury the answer under ads and interstitials. These pages do the opposite: the calculator is at the top, it works on your phone in the lumberyard aisle, and each page explains the math underneath so you can check the work yourself.