Sakrete Concrete Calculator
Calculate how many bags of Sakrete concrete mix you need — enter your slab dimensions to get the bag count for 60 and 80 lb bags, with a waste allowance and an estimated cost.
How many bags of Sakrete concrete do I need?
Sakrete is a long-running bagged concrete brand sold at many home centers and lumberyards. Its standard concrete mix commonly comes in 60 and 80 lb bags, yielding about 0.45 and 0.60 cubic feet each — the same yields used across general-purpose mixes, so about 60 or 45 bags per cubic yard. This calculator sizes a Sakrete job from your dimensions.
To size it, the calculator takes your slab volume and divides by the bag yield, rounding up with a waste allowance. Sakrete concrete mix is sold in 60 and 80 lb bags, and the result shows the count for each size so you can pick whichever your store stocks or you can lift.
bags = (length × width × thickness ÷ 12, in cu ft) ÷ bag yield
For a bigger pour, compare Sakrete bags against ready-mix with the concrete calculator, or price a delivery with the concrete cost calculator.
Concrete bag calculators by brand
Size a job with another concrete brand:
Frequently asked questions
How many bags of Sakrete concrete do I need?
Find your slab volume in cubic feet (length × width × thickness, all in feet), then divide by the bag yield: about 0.60 cu ft for an 80 lb bag, 0.45 for 60 lb and 0.30 for 40 lb. Sakrete concrete mix comes in 60 and 80 lb bags. The calculator above does this from your dimensions and rounds up.
How many Sakrete bags make a cubic yard?
A cubic yard is 27 cubic feet, so it takes about 45 × 80 lb bags, 60 × 60 lb bags, or 90 × 40 lb bags of Sakrete concrete mix — the same as any general-purpose mix at standard yields.
How much does an 80 lb bag of concrete cover?
An 80 lb bag of standard concrete mix yields about 0.60 cubic feet of finished concrete. That covers roughly 1.8 square feet at 4 inches thick, or 1.2 square feet at 6 inches. The calculator converts your area and thickness into the exact bag count.
How many bags of concrete for a fence post?
For a typical 4-inch post in a 10-inch-wide hole 2 feet deep, plan on roughly one to two 50–60 lb bags per hole. Wider or deeper holes need more. Enter the hole as a round column above (diameter and depth) to size it exactly, and remember to subtract the post itself for a close figure.