Foundation Calculator

Calculate foundation dimensions, concrete requirements, and structural requirements for any building project.

Enter your building and soil details to calculate foundation requirements

Foundation Type

Building Length (ft)

Building Width (ft)

Foundation Depth (ft)

Foundation Width (ft)

Soil Type

Building Load (lbs/sq ft)

Strip: Continuous under walls

Pad: Individual for columns

Raft: Large slab foundation

Pile: Deep foundation

Trench: Narrow strip

Rock: 8,000 psf

Gravel: 4,000 psf

Sand: 3,000 psf

Clay: 2,000 psf

Silt: 1,500 psf

• Check frost line depth

• Consider soil conditions

• Include drainage provisions

• Plan for reinforcement

• Allow for working space