Construction Calculator
Concrete Calculator
Calculate concrete volume and estimated material cost for slabs, pads, footings, trenches, piers, posts, sonotubes, and round columns.
Choose project type
Project Inputs
Best for patios, driveways, garage slabs, shed pads, and flat rectangular pours.
Results
Recommended order amount
1.36 yd³
Includes 10% waste.
This estimate is for material planning only. Actual concrete needs can change based on excavation, subgrade, formwork, compaction, slope, and contractor requirements.
How this concrete calculator works
This calculator estimates concrete volume by converting your project dimensions into cubic feet, then converting cubic feet into cubic yards. Since ready-mix concrete is commonly ordered by the cubic yard, the final order amount is shown in cubic yards.
The waste percentage adds extra concrete for spillage, uneven excavation, form variation, and jobsite conditions. A common waste range is 5% to 10%, but some projects may need more.
Concrete formulas used
Common concrete project examples
10 × 10 slab, 4 inches thick
A 10 ft by 10 ft slab at 4 inches thick needs about 1.23 cubic yards before waste.
40 ft footing, 12 × 12 inches
A 40 ft long footing that is 12 inches wide and 12 inches deep needs about 1.48 cubic yards before waste.
Four 12-inch piers, 3 ft deep
Four round piers with 12 inch diameter and 3 ft depth need about 0.35 cubic yards before waste.
Project tools
Recommended tools for concrete projects
Placeholder section for future affiliate links. Keep these useful, relevant, and below the calculator results.
Tape Measure
Useful for checking slab, footing, and form dimensions.
Concrete Trowel
Used for finishing and smoothing concrete surfaces.
Work Gloves
Protects hands when handling concrete, forms, and tools.
Mixing Tub
Helpful for small concrete batches and repair projects.
Concrete calculator FAQ
How many cubic feet are in one cubic yard of concrete?
One cubic yard contains 27 cubic feet. That is why this calculator divides cubic feet by 27 to estimate cubic yards.
How much waste should I add for concrete?
A common waste allowance is 5% to 10%. More complex projects, uneven excavation, or difficult pours may need a higher waste percentage.
Can this calculator be used for sonotubes?
Yes. Use the Pier / Column mode. Enter the tube diameter, depth, and quantity to estimate the required concrete.
Does this include labor or delivery fees?
No. The estimated cost only calculates material cost based on the cubic yards with waste and the price per cubic yard.