Footing Area for Soil Bearing
Required footing area and side dimension by soil class.
Example
You enter
- Column load (lb) 12000
- Soil class clay
You get
- Required area 8
Details, formula, and sources
Required bearing area A = P / q_allow. Allowable bearing pressure q_allow from IBC 2021 Table 1806.2 keyed to soil class.
IBC 2021 (International Building Code). Table 1806.2.
Free read-only access at codes.iccsafe.org.
Estimate. AHJ and licensed structural engineer govern.
Field names used by the API: column_load_lb, soil_class, required_area_ft2
- Bearing-capacity table data/construction/soil-bearing.json keyed to soil class (USGS / IBC-mirrored)IBC 2021 Table 1806.2