Concrete Calculator

The Concrete Calculator provides an estimate of the amount and weight of concrete required for a specified area. It's advisable to buy a bit more than the calculated amount to minimize the risk of running short on concrete.

Slabs, Square Footings, or Walls

Length (l)
Width (w)
Thickness or Height (h)

Hole, Column, or Round Footings

Diameter (d)
Depth or Height (h)

Circular Slab or Tube

Outer Diameter (d 1)
Inner Diameter (d 2)
Length or Height (h)

Curb and Gutter Barrier

Curb Depth
Gutter Width
Curb Height
Flag Thickness


Platform Depth
Number of Steps

Composition of Concrete

Concrete is made up of a mix of coarse aggregates — particulate elements like sand, gravel, crushed stone, and slag — all held together by cement. Cement acts as a binding agent, adhering to these aggregates and then solidifying over time. Notably, Portland cement stands out as the most widely used form of cement, playing a pivotal role in the making of concrete, mortar, and plasters.

Forms and Mixing

Concrete is available in various forms, such as 60 or 80-pound bags, or in bulk quantities delivered by specialized concrete mixer trucks. The key to robust and uniform concrete lies in the right mixing process. This involves the combination of water, aggregate, cement, and any chosen additives. Given its time-sensitive nature, it's crucial to place the concrete before it sets, as it is usually prepped in a fluid-like viscous state. Some concretes are even tailored to set faster for tasks that demand a quick set time. On the other hand, in certain industrial environments, drier concrete mixes are used to produce precast concrete items like concrete walls.

Curing: The Hardening Process

Once poured and in place, the concrete undergoes a process known as curing to harden. This is a gradual procedure, with concrete generally taking around a month to achieve over 90% of its eventual strength. However, the fortification can proceed for up to three years. Maintaining the concrete's moisture can amplify its strength during the initial curing stages. Techniques to ensure this include using compounds that form a water-retaining film on the concrete or 'ponding', where the concrete is submerged in water and encased in plastic.

How to Calculate Concrete?

To calculate concrete, determine the volume of the area you want to pour it in (length x width x height) and then decide on the desired thickness. Use these measurements to find the total volume needed. Typically, concrete is sold by cubic yards or cubic meters, so ensure your measurements align with the unit of sale. It's also a good practice to order a little extra to account for spillage or overestimating.

How to calculate yards of concrete?

To calculate yards of concrete, find the volume of the area to be poured by multiplying length x width x height (in feet). Then, divide the resulting volume by 27 to convert cubic feet to cubic yards. Always consider ordering a bit extra to account for spillage or underestimation.