About Us
Free calculators for materials, sizes and costs, so you know what to buy before you build. Online since 2004.
What We Build
Every calculator answers one job: how much material to buy, what size to install or what a project will cost. The site has 190 calculators in 24 categories, from concrete and roofing to HVAC, electrical and financing.
ConstructionCalculators.com changed hands in 2025 and was relaunched. We are rebuilding every calculator to one standard: feet, inches and fractions as you would write them on a tape, metric next to US units, and results rounded the way materials are sold, in whole bags, boxes and truck loads.
How We Check the Math
Formulas come from building codes and standards such as the IRC, ACI and NEC, and from manufacturer data for coverage and bag yields. We test each calculator against worked examples from those sources, and when a code, a product or a price changes, we update the calculator.
Every price in a calculator can be changed with a click, and the total follows.
Advertising
The site is free because of ads from Google AdSense. Ads never change a calculator’s result, and no advertiser pays for a calculator, a number or a mention. Our privacy policy explains how ads use cookies.
Contact
Found a mistake or missing a calculator? Tell us through the contact form.
You’re welcome to link to any page on the site without asking. We don’t offer an API at the moment.