Construction calculators that end in a shopping list.

Enter your measurements — get bags, boxes, yards and tons, with cost, ready to buy. Free, no sign-up, works on your phone.

Concrete Mulch Gravel Paint Stairs

Calculators

Calculate concrete for slabs, footings, columns and steps: cubic yards for ready-mix, bag counts for 40–90 lb bags,…

Calculate rebar for a slab: bars each way, total linear feet with lap splices, weight by bar size (#3–#8) and 20-ft…

Calculate how much mulch you need: cubic yards for bulk delivery and bag counts for 1.5, 2 and 3 cu ft bags — for…

Calculate gravel, crushed stone, pea gravel, river rock or sand for driveways, paths and beds: cubic yards, cubic…

Calculate paint for a room or wall: paintable area minus doors and windows, gallons for your coats, coverage by paint…

Calculate stairs from floor-to-floor height: number of risers, exact riser height, treads, total run, stringer length…

Slabs, footings, columns, rebar and bags-vs-ready-mix math — in cubic yards, cubic metres and bag counts.

Mulch, gravel, soil and stone by the bag, the cubic yard and the ton — with bulk-vs-bags price checks.

Paint, drywall, tile and flooring quantities with real-world coverage rates and waste factors.

Stairs, rafters, studs and board-foot math with code-referenced checks.

Every calculator converts to what you actually buy — 80-lb bags, 2 cu ft bags, 20-ft sticks, gallons — and rounds up the way a supplier would.

Formula, assumptions and a worked example on every page, so you can check the math before you spend money.

Bag yields, densities and coverage rates carry sources and a verification date. Prices are editable — put in your store's number.