Concrete Calculators
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These pages answer how much concrete or cement a shape needs. The concrete, slab, and footing calculators start at 2,400 kg/m³. That is a planning default for the weight of the pour, about 2.02 short tons and 4045.33 lb per cubic yard. It is not a mix design.
A slab usually needs more answers after the volume: bags if you are mixing them, the steel in the slab, and the stone under it. Premix bag counts are on this hub. Rebar, mesh sheets, and other steel shapes are the steel hub. A gravel base is the gravel hub. Asphalt is listed here because it is the other paved surface on the site, not because it is a concrete mix.
A column is a round or square pier, including a sonotube diameter. A post hole subtracts the post. Steps are solid blocks from grade plus a full-height landing. A driveway is the 4, 5, or 6 inch thickness guide, with a truck count that is a planning assumption.
Which calculator do I need?
| Job | Open |
|---|---|
| Volume and weight of a pour | Concrete |
| Bags of premixed concrete | Concrete bags |
| A flat slab | Concrete slab |
| A driveway, with a truck count | Concrete driveway |
| A footing or pier | Concrete footing |
| A round or square column, or a sonotube | Concrete column |
| Concrete in a post hole, post subtracted | Concrete post hole |
| Steps, with a full-height landing | Concrete steps |
| Bags of cement | Cement |
| Cement, sand, and aggregate proportions | Cement, sand, and aggregate |
| Only the sand in a concrete mix | Concrete sand |
| An asphalt surface instead of concrete | Asphalt |
| A bagged self-leveling compound, on the flooring hub | Self-leveling |
| The bar inside the slab or footing | Rebar, on the steel hub |
Guides
- Bags vs ready-mix
How to compare bag yield with a plant quote, including labor, mixing, and the short-load question to ask.
- Concrete mix ratios
IS 456 Table 9 for M10, M15, and M20, and how the 1:2:4 calculator uses the 1.54 factor.
Calculators
Concrete calculator
Concrete volume and weight at a 2,400 kg/m³ planning start.
Concrete slab calculator
Slab volume from length, width, and thickness.
Concrete driveway calculator
Driveway yards at 4, 5, or 6 inches, plus a planning truck count.
Concrete bag calculator
40, 60, and 80 lb bags, plus 25 and 50 kg bags, from the pour volume.
Concrete footing calculator
Footing volume from length, width, and depth.
Concrete column calculator
Round or square columns, including sonotube diameters, in yards and bags.
Concrete post hole calculator
Concrete left in a post hole after the post is subtracted.
Concrete steps calculator
Solid steps from grade, plus a full-height landing.
Cement calculator
Cement for a mix, in weight and bags.
Cement sand aggregate calculator
1:2:4 and the other ratios, with the 1.54 dry factor, in m³ and CFT.
Concrete sand calculator
The sand portion of a concrete mix.
Asphalt calculator
Asphalt volume for a paved surface. Not a concrete mix.