Practical numbers. Clear assumptions.

Get the number before you buy the materials.

Fast, mobile-friendly calculators for real home and DIY decisions. Inputs stay in your browser and every estimate explains how it was produced.

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Home & DIY calculators

Square Footage Calculate square footage of a room, an L-shaped space or several rooms in square feet and square meters, with an optional waste allowance.

Paint Estimate wall paint in liters and US gallons, including openings, coats, coverage, waste, container count, and optional cost.

Flooring Estimate flooring area, waste, boxes, purchased coverage, and optional material cost.

Tile Estimate tiles and boxes from surface size and tile size, with overage by layout (straight, diagonal, herringbone) and optional box price.

Concrete Slab Estimate concrete volume, ready-mix cubic yards, premix bag count, waste, and optional material cost for a rectangular slab.

Mulch & Bark Estimate mulch or bark chippings volume in cubic yards, cubic feet, and liters from area and depth, with bag rounding and optional cost.

Fence Estimate fence panels, posts, and the combined postcrete (post-hole concrete) needed for a straight run, with optional material cost.

Post Concrete Calculate postcrete or premix concrete bags needed to set one or more fence, deck, or gate posts, with optional material cost.

Carpet Estimate carpet from a fixed roll width, including waste, an optional stair allowance, roll length to order, and optional cost.

Epoxy Resin Estimate two-part epoxy resin volume by coverage thickness, with A/B part split by mix ratio, kit rounding, and optional cost.

Pond Volume Estimate pond water volume for an irregular or sloped-side pond, plus liner size and pump sizing guidance.

Pool Volume Estimate rectangular pool water volume from shallow and deep-end depth, plus an estimated fill time and optional water cost.

Wall Area Calculate net wall area (openings subtracted) in square meters and square feet, to feed paint, wallpaper, drywall/plasterboard, or cladding coverage.

Wallpaper Rolls Estimate wallpaper rolls needed from room size, roll dimensions, and an optional pattern repeat, with drop and strip counts.

Drywall Estimate drywall or plasterboard sheets needed from area, waste, and standard sheet size, with optional material cost.

Gravel Estimate gravel volume, tonnes, and bags from area, depth, and density, with optional material cost.

Mortar (Brick) Estimate brick count and mortar volume/bags for a brick wall face from wall size, brick size, and joint thickness.

Deck Boards Estimate deck boards needed from deck area, board width, gap, and stock length - boards only, no framing or spans.

Insulation Rolls Estimate loft or wall insulation rolls/batts needed from area, waste, and per-roll coverage, with optional cost.

Plywood / Sheathing Estimate plywood or sheathing sheets needed from area, waste, and standard sheet size - quantity only, no span ratings.

Siding / Cladding Estimate siding (US) or cladding (UK) panels/boards needed from net wall area and panel coverage, with optional material cost.

Epoxy Floor Coating Estimate epoxy floor coating kits from area, number of coats, and coverage rate - a thin coating tool, distinct from casting/table-top epoxy resin.

Pavers & Patio Estimate pavers or patio slabs, base material, bedding sand, and edging for a patio project from area and paver size.

Roof Shingles Estimate shingle bundles and roofing squares from footprint and roof pitch, with waste. Shows how to calculate roof shingles step by step.

Deck Mud Estimate deck mud (floor mud) bags for a sloped shower pan or a flat mortar bed from area, thickness at the drain and slope.

Plan by project

Each guide explains the order of work and which calculator to use at each step.

Flooring & tiling Measure the floor once, then size boxes of laminate or vinyl, tiles, carpet roll length, or epoxy coating kits.

Concrete & masonry Slab volume and premix bags, concrete for posts, bricks and mortar for a wall, and the gravel sub-base underneath.

Garden & landscaping Beds, paths, patios, decks, and fences: mulch and gravel by volume, pavers, deck boards, fence panels, and post concrete.

Ponds & pools Water volume for garden ponds and pools, plus liner size, pump turnover, and fill time.

Roofing & exterior walls Shingle bundles from footprint and pitch, siding or cladding panels, sheathing, and insulation for the building envelope.

The calculator and result come before ads or long explanations.

Coverage, waste, package size, and yield stay editable instead of being hidden constants.

Calculations run in your browser. The MVP does not need an account or database.