Free construction calculators built on one principle: show the work.
Construction Calc HQ is a free set of construction estimating calculators for builders, contractors, and homeowners. Every tool gives you the quantity you need — cubic yards, bags, sheets, bundles — along with the formula behind it and a regional cost estimate.
Most online calculators hand you a number with no way to check it. We show the formula, name the standard it comes from, and apply the correct waste factor for your material. The aim is a number a professional would accept, not a black box.
Everything is free and works in your browser. We don't gate tools behind a login or collect your phone number to sell you materials. The site is supported by unobtrusive advertising.