Construction & DIY

Omni Calculator (Construction)

Hundreds of free construction calculators, from concrete slabs to roof pitch.

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Nov 2, 2026
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omnicalculator.com

Omni has a large set of construction calculators that are easy to use on a phone. They're handy on site when you need a quick number.

What you can do with it

  • Calculate concrete for slabs, columns and footings
  • Work out roof pitch, rafters and stairs
  • Estimate blocks, bricks and paint

Good to know

Always add a bit extra for waste on top of the calculated amount.