Construction & DIY calculators
Concrete bags, square footage, mulch yards, and roofing squares. Every tool shows its formula, updates live, and works on any device.
Saved & recent
- Concrete CalculatorVolume of concrete for slabs, footings, and round columns in cubic feet and cubic yards, plus 80 lb bag counts with a 10% waste allowance built in.→
- Home Project Materials CalculatorEstimate materials for a dozen home projects with the label’s own coverage rate: paint, primer, flooring, tile, drywall, insulation, siding, fencing, decking, gravel, sod, grass seed, countertops, and wallpaper — units rounded up with waste built in and a cost line for each.→
- Mulch CalculatorMulch volume for rectangle, circle, and triangle beds from a depth in inches — cubic yards, 2 and 3 cu ft bag counts, and estimated bag cost at your price.→
- Roofing CalculatorRoofing squares, shingle bundles, underlayment rolls, and nail counts from the building footprint, pitch multiplier, complexity factor, and waste allowance.→
- Square Footage CalculatorRoom area from feet-and-inches measurements, with a multiplier for identical spaces and a waste factor, converted to square yards and acres for flooring jobs.→
- Trades & Shop CalculatorRafter lengths, roof pitch, snow load, stair layout, board feet, pipe offsets, clearance holes, and arch geometry — the trades formulas, all showing their work.→
How this manual is organized
Each entry above opens a one-page tool: inputs on the left, the live result on its color board, and beneath the card the formula with worked examples and the method's limits. Save the tools you use often — they'll wait on this shelf next visit.