Concrete orders are commonly rounded up because shortages are expensive during a pour.
Concrete
Concrete Calculator
Enter the slab dimensions and thickness to estimate ready-mix yards or bagged concrete quantities.
Example estimate ready.Change the measurements and product prices below. Values save only on this device.
Calculation method
How the estimate is built.
Length, width, and thickness determine slab volume. We apply the buffer to that volume and show both ready-mix cubic yards and the rounded count of bags at your selected yield.
Field notes
Use the estimate well.
Check local requirements for base preparation, reinforcement, frost depth, and permits.
Bagged concrete is practical for small pads and posts; ready-mix is usually better for larger slabs.
FAQ
Concrete questions
How thick should a concrete slab be?
Four inches is a common residential slab thickness, but driveways, hot tubs, footings, and structural work may need different specifications.
Should I order extra concrete?
A 5 to 10 percent buffer is common because subgrade variation and forms can change the real volume.
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