Soil Bearing Capacity Calculator
Calculate ultimate bearing capacity of soil using Terzaghi's formula
About this calculator
The Soil Bearing Capacity Calculator determines the ultimate bearing capacity of soil using Terzaghi's proven formula, a fundamental calculation in geotechnical engineering. This tool helps engineers, contractors, and students quickly assess how much load soil can safely support before failure occurs. By inputting soil properties like cohesion, unit weight, surcharge load, and foundation dimensions, you get accurate bearing capacity values essential for safe foundation design and construction planning.
How to use
Enter the required soil parameters including cohesion (c), unit weight (γ), surcharge load (q), and foundation width. Input the appropriate bearing capacity factors (Nc, Nq, Nγ) based on soil friction angle. Click calculate to get the ultimate bearing capacity result using Terzaghi's formula for your foundation design.
Frequently asked questions
What is Terzaghi's bearing capacity formula?
Terzaghi's formula calculates ultimate bearing capacity as qu = cNc + qNq + 0.5γBNγ, where c is cohesion, q is surcharge, γ is unit weight, B is foundation width, and N values are bearing capacity factors.
What bearing capacity factors should I use?
Bearing capacity factors (Nc, Nq, Nγ) depend on the soil's friction angle. These are standard values found in geotechnical engineering tables or calculated using established equations based on soil properties.
When should I apply a factor of safety?
Always apply a factor of safety (typically 2-3) to the ultimate bearing capacity to get allowable bearing capacity. This accounts for uncertainties in soil properties and construction variations.