Concrete Calculator

Your details

Pick the form that matches your pour; the inputs below change to suit it.
Long side of the slab or the run of the wall.
Short side of the slab or thickness of the wall.
4 in (100 mm) is typical for patios and driveways; 6 in for structural slabs.
Multiply for several identical footings, piers or columns.
Extra for spillage, uneven base and mixer loss. 5-10% is typical.
%
Used to work out how many pre-mix bags to buy.
Currency
Concrete volume
1.23yd³
Cubic metres0.944m³
Cubic feet33.33ft³
Order with waste1.36yd³
Approx. weight2,265kg
Pre-mix bags needed82
Net volume (yd³)1.23
Order with waste (yd³)1.36

Order about 1.36 yd³ (1.04 m³) for this pour.

  • Net volume is about 1.23 yd³ (0.94 m³); order ~1.36 yd³ once the waste allowance is added.
  • That is roughly 82 bags of 60 lb pre-mix, or about 2.3 tonnes of concrete.
  • Above about one cubic yard, ready-mix delivery is usually cheaper and far less work than mixing bags by hand.

Next stepRound the ready-mix order up to the nearest quarter or half yard and confirm the mix strength for your job.

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