Stair Calculator
Figure out risers, treads and stringer length for deck or interior stairs in seconds. Enter your total rise and target riser height for code-safe results.
Answers you can trust before you buy
Every calculator returns a purchasing answer in the units you actually buy — bags, boxes, gallons, sheets, yards or tons — with the formula, a worked example, and the assumptions printed on the same page. No hidden numbers, no sign-up, no cost.
Transparent formulas
Each page shows the exact formula and a worked example, so you can verify the math yourself instead of trusting a black box.
Waste built in
A realistic waste allowance for cuts, spillage and defects is added and rounded up, so you never run one bag or box short mid-project.
Honest limits
These are planning tools, not engineering documents. We state what each calculator does and does not account for, up front.
Popular Material Calculators
The calculators homeowners search for most. Each one returns a purchasing answer in the units you actually buy, with the formula and a worked example on the same page.
Cubic yards of concrete for slabs, footings and posts.
Open calculatorHow many bags of concrete mix your project needs.
Open calculatorGallons of paint for any room or wall.
Open calculatorBoxes of laminate, vinyl plank or hardwood.
Open calculatorBags or cubic yards of mulch for garden beds.
Open calculatorTons and yards of gravel for driveways and paths.
Open calculatorSheets of drywall for walls and ceilings.
Open calculatorBundles and squares of asphalt shingles.
Open calculatorSquare feet of any room, lot or area.
Open calculatorWhat Are You Building?
Pick a project to jump into the right calculator — or open the Patio planner for a full concrete + base list.
Plan Your Project
Plain-English guides that show how to measure, do the math, and buy the right amount of material — each one paired with the site’s free calculators.