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Trowelly

15 free calculators · no sign-up

Measure once.
Buy the right amount.

Concrete, gravel, mulch, paint, flooring, decking and more. Enter your measurements in feet or meters and get bags, yards, tons and boxes, with sensible allowances for waste.

Concrete & Hardscape

Estimate concrete, pavers and base material for slabs, patios, paths and footings before you order.

Concrete CalculatorBags or cubic yards of concrete for slabs, footings and post holes.Cubic Yard CalculatorConvert any area and depth to cubic yards, cubic feet and cubic meters.Paver CalculatorPavers, gravel base and bedding sand for a patio or walkway.

Landscaping & Yard

Work out how much gravel, mulch, topsoil or sand to order for beds, paths, lawns and driveways.

Gravel CalculatorCubic yards, tons and bags of gravel for paths, driveways and bases.Mulch CalculatorCubic yards and bags of mulch for garden beds at any depth.Topsoil CalculatorTopsoil, garden soil or compost for lawns and raised beds.Sand CalculatorSand for paver bedding, sandboxes and leveling, in yards, tons or bags.

Interior Projects

Measure a room once and get paint, drywall, flooring and tile quantities with sensible allowances for waste.

Square Footage CalculatorArea in square feet, square yards, square meters and acres.Paint CalculatorGallons of paint for a room’s walls and ceiling, minus doors and windows.Drywall CalculatorSheets of drywall for walls and ceiling, with extra for cuts.Flooring CalculatorBoxes of laminate, vinyl plank or hardwood flooring for a room.Tile CalculatorTiles and boxes for floors, walls and backsplashes, with grout joints.

Outdoor Builds

Count deck boards, fence posts and pickets, and shingle bundles for outdoor builds.

Roofing CalculatorRoofing squares and shingle bundles from your house footprint and pitch.Deck Board CalculatorDeck boards, joists and screws for a rectangular deck.Fence CalculatorPosts, rails, pickets and concrete bags for a wood fence.

Formulas you can check

Every calculator explains its formula, the densities and coverage rates it assumes, and a worked example.

One shopping list

Add results from several calculators to the project planner for combined quantities and a cost total.

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Calculations run in your browser. Your planner is saved on your device, not on our servers.