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Concrete calculator

Calculate slab or cylinder concrete volume in cubic metres and cubic yards, bags from labelled yield, and your bagged-versus-delivered costs.

Canadian dollars (CAD). Québec/Canadian assumptions as described below.

ShapeLength, width and diameter unit

Use decimal feet: 12 ft 6 in = 12.5 ft. Thickness/height has its own unit below.

LengthWidth

Full cylinder diameterNumber of identical cylindersWhole number.

Thickness or cylinder height unitSlab thickness or cylinder heightA volume calculation does not specify structural thickness.Chosen volume allowance (%)Confirm your assumption with the supplier.Mixed yield per bag (L)Use the label, not the bag weight or added water.

Compare bagged and delivered costs

All money is Canadian dollars. Taxable Québec amounts use 5% GST and 9.975% QST; choose taxes included when they are already in your quote. Unknown costs stay unknown. Enter zero only for a confirmed zero cost.

Concrete bagsCost status

Price per bagCADLeave blank if unknown.Tax treatment

Transport and rentalCost status

AmountCADLeave blank if unknown.Tax treatment

Labour and handlingCost status

AmountCADLeave blank if unknown.Tax treatment

Delivered concreteCost status

Delivered concrete pricing

Billed volume unitMinimum billable volumeIn the billed unit. Enter 0 only for a confirmed no-minimum quote.

AmountCADLeave blank if unknown.Tax treatment

Delivery, short-load and waiting feesCost status

AmountCADLeave blank if unknown.Tax treatment

Pump, access and labourCost status

AmountCADLeave blank if unknown.Tax treatment

Both options cover the same volume and work.

Handling weight

Actual weight per bag (kg)Optional. Used only for total handling weight.

Local calculations. No account required.

Enter your inputs to calculate.

Volume and bag yield

A rectangular slab uses length × width × thickness. A solid cylinder uses π × radius² × height × count. The chosen allowance increases geometric volume; it is not engineering advice. Bags use mixed yield in litres, not bag weight or added water. Round the final bag count upward.

A 10 ft × 12 ft slab, 4 in thick, is 1.13267386368 m³ before allowance. With 10% allowance and an illustrative 14 L per bag, it requires 89 bags. Confirm the actual product yield on its label: Sika/Sakrete concrete product reference (French).

Compare complete quotes

Include delivery minimums, short-load charges, waiting, pump access, rentals, handling and labour. Costs are comparable only when all selected items and the same scope are confirmed. This calculator does not specify structural thickness, reinforcement, crew size or placement time. Check permits and design requirements separately.

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