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Concrete slab calculator

See also: Pier foundation calculator, Strip foundation calculator

Drawing scale :

Fill in dimensions in mm:

Slab width: X
Slab length: Y
Slab height: H

Rebar parameters:

(fill in all 0 if no need)

Rebar mash length: Z
Rebar mash width: W
Rows count: R
Weight 1 m of rebar, kg:

Formwork parameters:

(fill in all 0 if no need)

Board thickness:
Board length:
Board width:

Concrete mix parameters:

(fill in 0 if no need)

Bag weight, kg:

Concrete proportion by weight
cement : sand : gravel :

: :

Enter construction materials price:

(fill in 0 if no need)

Cement (per bag)
Sand (per 1 ton)
Gravel (per 1 ton)
Board (per 1 cubic meter)
Rebar (per 1 ton)

One of the shallow foundations types used for the construction of dwelling houses is a foundation monolithic plate. This type of structures is ideal for frame and wooden houses, garages and saunas, patios as well as for other similar buildings and structures. It is also called a shallow foundation or surface structure. Because of the shallow depth, the foundation of a house is deepened only to 0.4-0.5 m. At the same time, there are situations when houses have basements, – in this case, foundation plates are established in accordance with the design documentation and available drawings to the required depth of the footing. The rigid structure is a specific feature of this type of houses base. The given concrete slab calculator is a perfect tool to estimate the amount of materials needed, in particular, it can be used to calculate:

  • the quantity of construction materials like gravel chippings, sand, cement, and  required for the mortar;
  • volume of the concrete needed for the foundation plate;
  • quantity of wooden boards to build a formwork;
  • approximate sum of expenditures to buy construction materials;
  • rebar needed to reinforce the cast-in-place structure (it depends on geological conditions and type of the project).

All parameters are to be indicated in mm when entering into boxes.

If the reinforcement is not planned, you may miss the boxes designed for the calculation of the reinforcement quantity and weight.

  •  X — Width of a plate;
  • Y — Length of it;
  • H — Height;
  • W — Width of a section (mesh);
  • Z — Length of a section (mesh);
  • R — Number of horizontal rows of rebar;
  • D — Diameter of rebar.

This online application was design also as a concrete slab cost (total price) calculator. Therefore, you may know approximately how much you are going to pay for construction materials and your project in total before you start it.

The amount of the cement to produce 1 m³ of the concrete will vary depending on a case. It significantly depends on the amount of fillers and proportions used, preferable type of the mortar and type of cement.

  • K — Weight of a cement bag, in kg;
  • M — Total quantity of cement bags to receive 1 m³ of the mortar;
  • L — Length of a wooden board to establish a formwork;
  • T — Thickness;
  • H — Width.

The slab on grade  is just another form of the shallow frame. It is monolithic and usually lies under total area of a construction site. You may go for it if you would like to have a house or another building without basement. Before you launch construction, you should contact a skilled and qualified engineer to specify the dimensions and design of it as it greatly depends on the structure, which will be on the top. You should not neglect this rule as wrong footing establishment or improper pouring may lead to cracking problems.

In order to avoid the deformation because of existing pressure on a foundation, the reinforcement of a frame is necessary.

Building a support framework required a larger consumption of the mortar and bigger amount of rebar, and it leads to increasing expenses incurred for the construction of the plate foundation. Actually it is always more expensive than a classical foundation. Thus, it is better to estimate the monolithic slab foundation cost in advance.

Calculation of the beton volume needed for the correct and solid installation of the cement cover or amount of the reinforcement bars, which are used to form a monolithic frame, will allow you to purchase materials with some little stock avoiding excessive consumption of them.

Remember the simple rule: in order to build this type of foundation, you should know how to calculate concrete slab and how much does it cost. This is the key for success.

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