Concrete Calculator Suite

Slabs · Round Footings · Circular Tubes · Curb & Gutter · Stairs — fast estimates, cubic yards and bag counts.

Slabs, Square Footings, or Walls

Enter length, width (feet) and thickness (inches). Thickness is converted to feet for volume.

Length (ft) Width (ft)

Thickness (inches) Quantity

Hole, Column, or Round Footings

Volume for circular footings: π × (d/2)^2 × depth. Depth in feet.

Diameter (ft) Depth (ft)

Quantity

Circular Slab or Tube

Hollow circular slab/tube: volume = π × (d1^2 - d2^2)/4 × height. Height in inches or feet.

Outer Diameter (ft) Inner Diameter (ft)

Length / Height (inches) Quantity

Curb and Gutter Barrier

Estimate using curb cross section and gutter area. Enter dimensions in inches and length in feet.

Curb Depth (in) Gutter Width (in)

Curb Height (in) Flag Thick (in)

Length (ft) Quantity

Stairs

Estimate stair volume: steps × run × rise × width (all inches) divided by 1728 to convert to cubic feet.

Run (inches) Rise (inches)

Width (inches) Platform Depth (in)

Number of Steps

Concrete Info & Notes

Concrete cures over weeks — plan slightly over estimates to avoid shortages. If you need help selecting mixes or admixtures (fiber, accelerators), consult your supplier. The calculators are approximations for quick planning — for structural design always consult an engineer.