Concrete & Site Calculators

12 live calculators · free, instant & private
Concrete calculatorSlab, footing & column in one — yd³, m³ and lb/kg bag counts with waste.Open calculator →Gravel & mulch calculatorYards, tons and bags for 11 materials at real densities.Open calculator →Fence calculatorPosts, rails, pickets, concrete bags and material cost.Open calculator →Stairs calculatorRiser, run, stringer and angle with IRC code limits checked.Open calculator →Mulch calculatorCubic yards, 2 ft³ bags and cost — with the bags-per-yard number and a bulk-vs-bagged comparison.Open calculator →Topsoil calculatorYards, bags and tons for lawns, beds and raised beds — with a settling allowance and a weight check.Open calculator →Sod calculatorSquare feet, pieces and pallets for a new lawn, with waste allowance for curves and offcuts.Open calculator →Pool volume calculatorGallons and litres for rectangular, round and oval pools, including a sloping floor and fill cost.Open calculator →Retaining wall calculatorBlocks, caps, base stone and drainage gravel — including the buried course most estimates miss.Open calculator →Brick calculatorBricks per square foot by size and mortar joint, with openings deducted and mortar bags counted.Open calculator →Pool chlorine calculatorDose for liquid, cal-hypo, dichlor or trichlor — plus the stabiliser and calcium each one adds.Open calculator →Cubic Yard calculatorConcrete, gravel, mulch and soil volume with weightOpen calculator →
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Related construction calculators

From the other construction sub-categories — same engine, same privacy.

Paint calculatorFree, instant and private — runs entirely in your browser.Interior Finishes →Roofing calculatorPitch multiplier, squares, bundles, underlayment and nails.Roofing & Lumber →Tile calculatorTiles and boxes to buy, with the right waste allowance for your layout.Interior Finishes →Board foot calculatorFree, instant and private — runs entirely in your browser.Roofing & Lumber →Flooring calculatorBoxes needed across up to four rooms with layout-based waste.Interior Finishes →Deck boards calculatorBoards, linear feet, joists and screws — with the board gap and final-row width worked out.Roofing & Lumber →

Guides for concrete & site

Worked examples and the reasoning behind these calculators. Browse all guides →

ConstructionStair Rise and Run: Getting the Numbers RightAug 27, 2026 · 7 min readConstructionHow Many Fence Posts Do I Need?Aug 26, 2026 · 6 min readConstructionHow Many Bricks Per Square Foot?Aug 21, 2026 · 6 min readConstructionHow Many Gallons Is My Pool?Aug 15, 2026 · 6 min readConstructionHow Much Paint Do I Need for a Room?Jul 26, 2026 · 4 min readConstructionMulch, Topsoil and Gravel by the Cubic YardJul 8, 2026 · 6 min read

About these calculators

Concrete is sold by volume and wasted by the barrow-load, so the arithmetic is worth doing twice. The concrete calculator converts slab, footing and column dimensions into cubic yards or metres and into bag counts, so you can compare mixing on site against ordering ready-mix.

The rest of this group covers the work around the pour — gravel base depth, fence post spacing and stair rise and run. Structural work must meet your local building code, and these figures are for planning and ordering, not a substitute for approved drawings.

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Every category, same promise: runs in your browser, shows its math, never sees your numbers.

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