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Calculator Answers

Sakrete Concrete Calculator

Blake Boege
Written by Blake Boege · Founder, Calculator Answers

A Sakrete concrete calculator is a construction tool designed to compute the required quantity of pre-mixed concrete bags (specifically Sakrete-brand bags) for a given project volume. By converting slab dimensions (length, width, and thickness) into cubic feet and factoring in a waste allowance, it divides the total volume by the standard yield of standard bag weights (0.60 cubic feet for an 80 lb bag, 0.45 for 60 lb, and 0.30 for 40 lb) to find the total bag count.

Calculate the total number of Sakrete pre-mix concrete bags required for your project. Choose between 40 lb, 60 lb, and 80 lb bags, specify your slab's dimensions and waste percentage, and get instant results.

See also: Concrete Calculator and Cubic Yard Calculator.

Quick Answer

Calculate the exact number of 40 lb, 60 lb, or 80 lb Sakrete concrete bags required for a slab. Enter length, width, thickness, and waste allowance.

Slab Dimensions

ft
ft
in

Patios and slabs are commonly 4–6 inches.

%

We recommend 10% for spills and grade gaps.

Sakrete bag size

Concrete Needed

Sakrete 80 lb bags (incl. waste)

62

61.1 bags exactly, rounded up

Cubic yards1.23
Cubic feet33.33
Bag coverage yield0.6 ft³

At 1.23 yd³, ordering ready-mix concrete from a truck is typically cheaper and easier than mixing 62 bags by hand.

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Examples

10 ft × 10 ft × 4 in slab with 80 lb bags

≈ 56 bags (incl. 10% waste)

5 ft × 5 ft × 6 in slab with 60 lb bags

≈ 31 bags (incl. 10% waste)

3 ft × 3 ft × 4 in footing pad with 40 lb bags

≈ 11 bags (incl. 10% waste)

How it works

The calculator converts slab measurements to cubic volume in feet, applies the waste factor, and divides by the precise cubic foot yield of the selected bag weight:

Volume (Cubic Feet):

Volume = Length (ft) × Width (ft) × (Thickness (in) ÷ 12)

Sakrete Bag Yields:

80 lb bag yield = 0.60 ft³

60 lb bag yield = 0.45 ft³

40 lb bag yield = 0.30 ft³

Bag Calculation:

Total Bags = Ceil((Volume × (1 + Waste ÷ 100)) ÷ Bag Yield)

Related Calculators

More tools from Home

Concrete CalculatorEstimate the cubic yards, cubic feet, and number of bags of concrete you need for slabs.Cubic Yard CalculatorFind the cubic yards you need for concrete, gravel, mulch, or soil from length, width, and depth — with weight estimates.

Frequently asked questions

It depends on the bag size. A standard 80 lb bag of Sakrete yields approximately 0.60 cubic feet. A 60 lb bag yields 0.45 cubic feet, and a 40 lb bag yields 0.30 cubic feet.

One cubic yard contains 27 cubic feet. Therefore, you would need 45 bags of 80 lb mix, 60 bags of 60 lb mix, or 90 bags of 40 lb mix to equal one cubic yard of concrete volume.

Yes. Adding a 10% waste allowance is standard practice in masonry projects to account for spillage, inconsistencies in the subgrade depth, and over-pouring at slab edges.

If your project requires more than 1 cubic yard of concrete (approx. 45 bags of 80 lb mix), mixing by hand becomes extremely labor-intensive. In such cases, ordering ready-mix delivered by a truck is often more cost-effective and saves significant time.