Concrete & Site Calculators
4 live · 4 planned · free, instant & privateConcrete 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 →
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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.