Construction calculators
Works in your browser. Nothing is uploaded.Concrete calculator
How much concrete a slab, a footing or columns need, and how many bags of your size to buy.
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ft
ft
in
in
ft
%
ft³
With extra
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In cubic yards
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Construction calculators
ConcreteSlabs, footings and columns, in bags of your size.StairsRisers, treads and stringersDrywallSheets, screws and tapeTileTiles, adhesive and groutPaintCans for walls and ceilingsDeck boardsBoards, joists and screwsGravel and mulchBags or bulk for an areaBricks and blocksCount and mortar for a wallRoofingSquares, bundles and underlaymentRafter lengthFrom span, pitch and overhang
How to use it
- Pick the shape
A slab or a footing, or round columns, in feet or metres.
- Type the sizes
Length, width and thickness, or the column’s size and how many.
- Set the bag
Type what one bag makes, from its label, and the extra for waste.
Tips
- Read the bag
The label says how much one bag makes. Bag sizes differ from country to country.
- Waste
Uneven ground and spills eat concrete: 5–10% extra is usual for a slab.
- Big pours
Past a cubic yard or so, ready-mix is often easier than mixing bags.
In the app
Construction tools in Clinometer
- Calculators with drawings for each job
- What to buy, with the label code to look for
- Rooms that total their materials
- Shopping lists to tick off or send to To-do
Get it onGoogle PlayComing soon to the App Store
Construction tools guide ›