Concrete Calculators: Volume, Mix Ratios and Yardage

This collection of concrete calculators helps builders, contractors, and DIYers plan pours with confidence. Work out exactly how much material you need for slabs, footings, walls, columns, stairs, and curbs before ordering, so you avoid costly shortfalls or leftover mix.Use the Concrete Yardage and Concrete Volume calculators to estimate cubic yards for any pour, or the Concrete Mix Ratio and Concrete Ingredients tools to get the right proportions of cement, sand, and aggregate. The Curb and Gutter Barrier Concrete Yardage, Concrete Column Fill, and Number of Concrete Blocks calculators cover specialized jobs, while the Concrete Slab Maximum Wall Load tool checks whether your slab can safely carry the load above it.

Concrete Volume

Estimate the concrete needed to fill cylindrical forms such as piers, columns, Sonotubes, or drilled shafts. Enter the radius, depth, and quantity to get the total volume in cubic yards.

Cement and Sand for Plastering

Estimate how many bags of cement and how much sand you need for plastering. Enter the plastering area, thickness and mix ratio to get instant quantities.

Concrete Stairs

Estimate how much concrete you need to pour a staircase. Enter the number of steps, riser height, tread depth, and stair width to get the required concrete volume in cubic yards.

Concrete Wall

Estimate how much concrete you need for a wall in cubic yards. Enter the wall's length and height in feet and its thickness in inches to get the concrete yardage for ordering ready-mix.

Concrete Ingredients

Estimate how much cement, sand, and coarse aggregate you need for a slab, beam, or circular column. Enter the dimensions, pick your units, and set the mix ratio (e.g., 1:3:3) to get the volume of each ingredient.

Number of Concrete Blocks

Estimate how many concrete blocks you need for a wall. Enter the block dimensions in mm and the wall height and width in metres — the calculator divides the wall area by the block area and rounds up to the next whole block.

Concrete Slab Maximum Wall Load

Calculate the maximum wall load a concrete slab-on-grade can support (lbs/ft). Enter the concrete compressive strength (psi), modulus of subgrade reaction (pci), and slab thickness (in).

Concrete Footing Volume

Calculate the concrete volume for a rectangular footing with an inner void. Enter the outside and inside dimensions plus the thickness to get the result in cubic feet and cubic yards.

Concrete Column Fill

Estimate the concrete needed to fill a round column in cubic yards. Enter the diameter in inches and the height in feet — useful for piers, form tubes and structural columns.

Concrete Slab Maximum Length

Enter relative humidity, concrete tensile stress, and shrinkage strain to estimate the maximum slab length between joints and reduce the risk of shrinkage cracking.

Concrete Mix Ratio

Estimate how much cement, sharp sand, gravel and water you need for a concrete pour. Enter the width, height and depth of your slab, footing or structure in meters and get material quantities instantly.

Curb and Gutter Barrier Concrete Yardage

Estimates the volume of concrete, in cubic yards, needed to pour a curb and gutter barrier. Enter the length of the run plus the gutter width, gutter depth, and curb height in inches.

Rebar Weight

Calculate the weight of reinforcing steel bars from diameter, length, quantity and steel density. Get weight per bar and total weight in kg and pounds, plus kg/m for site checks.

Rebar Count

Work out how many rebar bars fit evenly across a slab, footing or wall and the exact equal centre-to-centre spacing. Enter the placement width, edge cover and target spacing.

Concrete Footing/Slab Pours

Calculate the concrete volume needed for a rectangular footing or slab pour. Enter the footing length in feet plus the width and depth in inches, and get the result in cubic yards.

Concrete Slab Pour Volume

Estimate how much concrete you need for a rectangular slab. Enter the width and length in feet and the thickness in inches to get the pour volume in cubic yards.

Concrete footing yard

Calculate the output pulse duration of a 555 timer in monostable (one-shot) mode. Enter the resistance and capacitance values with their units to get the time delay in seconds.