Home & DIY

Material calculators for projects you can measure.

Estimate area, paint, flooring, tile, concrete, fencing, decking, landscaping, pools and roofing using editable real-world assumptions.

Plan by project

Project guides

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.

Walls, painting & insulation Net wall area first, then paint, wallpaper rolls, drywall sheets, insulation, and sheathing for a room.

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.

Epoxy floors & resin casting Two very different epoxy jobs: thin floor coatings sold by coverage, and resin pours sized by volume and mix ratio.

Square Footage Free square footage calculator: enter feet, inches or meters, add an L-shape or up to three rooms, and get sq ft and m² with a 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 How much tile do I need? Tiles and boxes for floors, shower walls and backsplashes, with overage by layout: straight 10%, diagonal 15%, herringbone 20%.

Concrete Slab How much concrete for a slab? Get cubic yards, m³ and 40, 60 or 80 lb premix bag counts with waste. A 10x10 ft slab 4 in thick needs about 56 x 80 lb bags.

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 Paver calculator for patios: pavers or slabs, base gravel in tons, bedding sand and edging from patio area and paver size, with waste.

Roof Shingles How many shingle bundles do you need? Roof area x pitch factor, plus waste, divided into squares (100 sq ft) at 3 bundles per square. Free calculator.

Deck Mud How many bags of deck mud for a shower pan? Enter floor size, thickness at the drain and slope to get cubic feet and 60/80 lb bags per square foot.

Firewood Cord Convert a firewood stack's length, height, and depth into full cords, face cords, cubic feet, cubic meters, and steres, with an optional price per cord.

What these calculators do

They convert measurements into an ordering estimate. They do not replace product instructions, an installer, structural design, or local building requirements.

How to get a better estimate

Measure each simple shape separately.
Use the exact coverage, package size, or yield from the product you plan to buy.
Choose a waste factor that reflects cuts, pattern, breakage, and the shape of the project.
Round to complete retail packages and verify stock comes from a compatible batch where relevant.