Construction calculators » Calculation of the foundation slab

Online foundation slab calculation

Length of the slab A mm
Width of the slab B mm
Height of the slab h mm
foundation slab calculation
Reinforcement
Concrete
Formwork
Foundation price


If you are planning to build a house and have chosen a monolithic foundation slab as the base, our slab foundation calculator will help you calculate all the necessary parameters. With its help, you can determine the thickness of the foundation slab, calculate the slab reinforcement, and select the optimal rebar.

To perform the calculation, you will need to know the geometric dimensions of the foundation and the approximate weight of the house. The weight of the building can be easily determined using our online load collection service for foundations.

Our online calculator allows you to:

  • Calculate the reinforcement for the monolithic slab by determining the required quantity and diameter of rebar rods;
  • Perform a punching shear calculation for the foundation slab to ensure structural safety;
  • Determine the amount of materials needed for formwork and select the optimal thickness of the boards;
  • Estimate the foundation cost for an economic comparison of different options.

The following input data and factors are used in the calculations:

  • Rebar of class B500B with diameters of 8, 10, 12, and 14 mm;
  • Reinforcement meshes with grid spacing of 100×100 mm and 200×200 mm;
  • Concrete cover thickness of 50 mm;
  • Steel density — 7850 kg/m3;
  • Rebar splicing by overlap;
  • Rebar weight safety factor — 5%;
  • Formwork material volume safety factor — 30%.

Use our online slab foundation calculator to quickly and accurately determine all the necessary parameters for your house foundation. This will help you optimize costs and ensure the reliability of your foundation.