Rowan Ashby

Anyone who has ever come up four bags short on a Saturday concrete pour or ordered drywall sheets using simple room square footage without accounting for window and door layout knows the difference between textbook geometry and job-site math. A “2x4” is 1.5 by 3.5 inches, an 80-pound bag of pre-mixed concrete yields 0.60 cubic feet (not 0.75), and a 7/12 hip roof requires a very different waste allowance than a simple 4/12 gable.

I started Hammerio as a collection of clean, phone-friendly takeoff sheets I could pull up in the truck without wading through pop-up contractor lead forms. Every calculator on Hammerio separates net geometric volume/area from gross order quantity with explicit waste percentages, bag yields, and unit cost breakdowns.