CalcQuarry

Free, fast calculators for concrete, gravel, mulch, stairs, roofs, lumber and more. Every formula is shown, tested and sourced.

36 free calculators for the questions that come up on a job: how many yards to order, how many bags to buy, how many steps to cut. Try another word, or browse the categories below. Each calculator writes out the math it uses, so you can check it by hand. Bag yields, weights and code limits come from data sheets, standards and building departments, linked on every page. The same tested functions power the calculator and the worked examples.