Concrete Calculator

Calculate concrete for slabs, walls, footings, curbs, columns, tubes, solid steps and post holes, then compare yards with bag yield.

Your measurements

Editable example

Use the unit on each label. You can also type feet and inches with ft and in, or the marks on your tape measure.

ShapeLength unitsChanges the dimensions labeled ft or m without a fixed unit. Thickness, openings and package sizes keep the inches, square feet, cubic feet and gallons shown on their labels.Length / step width (ft)Width / wall height (ft)Thickness (in)Identical sections or holes

Package sizes, prices and materials

Extra concrete (%)Bag exampleYield per bag (cu ft)Change this to the yield on your mix.Supplier minimum order (cu yd)Your concrete price per cu yd ($)Supplier order increment (cu yd)

Example: replace these measurements

Your material list

1.56 cubic yards of concrete

With your 5% extra · 1.4815 cu yd (40 cu ft) before extra

Shopping list & save options

Before extra: 1.4815 cu yd (40 cu ft)
With your allowance: 42 cu ft
Cubic meters: 1.1893
Bags of 80 lb: 70
Including supplier minimum: Minimum not entered
Supplier order after increment: Increment not entered
Concrete subtotal: Add your unit price

Thickness, reinforcement and foundation dimensions come from your accepted design. Delivery, pumping and waiting charges are separate.

Length and width run across the slab; thickness goes down through it. This measures quantity, not a recommended slab design.

The calculation

12 × 10 × 0.3333 = 40 cu ft per rectangle
40 × 1 identical shapes = 40 cu ft
40 × (1 + 5/100) ÷ 27 = 1.5556 cu yd

Material price trends, separate from your quote

These U.S. producer indexes track material prices over time. They are not store prices, labor rates or local installed costs. We do not use them to increase a historical project median.

Historical household spending: the national 2023 AHS median for driveway and walkway was $2,914. Driveways and walkways are combined, with no matched material, thickness or area. This broader category does not price your specific job.

Ready-mixed concrete

+2.3% from August 2025 to August 2026. Latest observation is preliminary and may be revised.

BLS producer index, not seasonally adjusted
Period	Index level, not dollars
August 2025	386.359
August 2026	395.186

U.S. Bureau of Labor Statistics · Updated 2026-09-20. Use your quoted unit price in the material calculator; delivery, tax, preparation and labor remain separate.

Plan the work as well as the order: Concrete mixing, curing & finishing: Plan the pour.

Before ordering, use the concrete measurement, yield & order handoff guide to check the inputs and take the right questions to the supplier. Choose another calculator.

How to plan the quantity

Slabs, footings, walls and curbs use rectangular volume: length × width or wall height × thickness. Thickness is in inches. Columns and post holes use solid circular area × height; tube mode can subtract an inner diameter. Multiply identical sections without re-entering their measurements.

Tube volume uses the circular area, subtracting an inner circle for a hollow tube. Steps mode assumes solid steps on a level base: width times tread depth times riser height times the sum of the step numbers.

The extra percentage is your ordering choice. Enter the bag yield from your mix, or ask a ready-mix supplier about their minimum, delivery charge and order increment.

Before you order

This measures concrete only. It does not specify thickness, reinforcement, base preparation, drainage, strength or curing.
The steps model is solid, not a stair shell. Footing dimensions must come from the design and local ground conditions.