Construction & DIY calculators
Materials and quantities for building, decorating and DIY jobs.
Concrete & groundwork
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What it does
Work out how much concrete you need for a slab, base or path, with extra for waste and an approximate weight.
Roofing
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What it does
Find a roof's pitch in degrees, as a rise in 12 and as a percentage, from its rise and run, plus the rafter length.