Footings
Design a Spread Footing (IBC 2024)
Design isolated spread footings to ACI 318-19 per IBC 2024 (ASCE 7-22): bearing, flexure, one-way and punching shear, and development length.
Design a Combined Footing to ACI 318-19
Design combined rectangular footings for two columns to ACI 318-19 per IBC 2024: bearing, overturning, sliding, flexure, shear and development length.
Design a Wall Footing to ACI 318-19
Design continuous wall footings to ACI 318-19 per IBC 2021 or IBC 2024. Results cover ultimate load, bearing capacity and serviceability.
Design a Pier Footing (IBC 2024)
Design pier, pole and deck-post footings to ACI 318-19 per IBC 2024 (ASCE 7-22): embedment, bearing, bending, shear and uplift.
Check a Point Load on a Slab on Grade
Check point load capacity on concrete slabs on grade using the Azzi-Laird and Shentu-Jiang-Hsu methods with ACI 318-19 material properties.
Guides and Examples
Understand Gross vs Net Soil Bearing Pressure in Spread Footing Design
How Calcs.com calculates gross and net soil bearing pressure, what the difference is, and how to input geotechnical values correctly.
Development Length in Footings
Fix footings that fail development length checks: switch to plain concrete, adjust thickness, or develop the rebar.
Spread Footing to ACI 318-14 - Validation Examples
Validation and design examples for concrete spread footings to ACI 318-14.
Retaining Walls
Design a Cantilever Retaining Wall (IBC 2024)
Design concrete or CMU cantilever retaining walls to IBC 2024, ASCE 7-22, ACI 318-19 and TMS 402-22, with shear key design and seismic loads.
Design a Restrained (Basement) Retaining Wall (IBC 2024)
Design restrained (basement) retaining walls to IBC 2024, ASCE 7-22 and ACI 318-19, with at-rest or active soil pressure and an optional shear key.
Guides and Examples
CMU Cantilever Retaining Wall Worked Example
Worked example: a reinforced CMU cantilever wall retaining 9 ft of earth, checked for bending and shear in the Cantilever Retaining Wall (IBC 2024) calculator.
Active Pressure on Shear Keys in Retaining Walls
Why a shear key can reduce the sliding factor of safety in the Cantilever Retaining Wall (IBC 2024) calculator: active pressure on the key.
Older Code Editions
Design a Spread Footing (IBC 2021)
Design isolated spread footings to ACI 318-19 per IBC 2021 (ASCE 7-16). An earlier code edition, kept for existing projects.
Design a Spread Footing to ACI 318-14
Design isolated spread footings to ACI 318-14. An earlier code edition, kept for existing projects.
Design a Wall Footing to ACI 318-14
Design continuous wall footings to ACI 318-14. An earlier code edition, kept for existing projects.
Design a Pier Footing to ACI 318-14
Design pier and deck footings to ACI 318-14 (IBC 2018). An earlier code edition, kept for existing projects.
Design a Pole Footing (IBC 2021)
Design pier and pole footings to ACI 318-19 per IBC 2021 (ASCE 7-16). An earlier code edition, kept for existing projects.
Design a Cantilever Retaining Wall (IBC 2021)
Design concrete or CMU cantilever retaining walls to IBC 2021, ASCE 7-16, ACI 318-19 and TMS 402-16. An earlier edition, kept for existing projects.
Design a Cantilever Retaining Wall to ACI 318-14
Design cantilever retaining walls to ACI 318-14 and IBC 2018. An earlier code edition, kept for existing projects.
Design a Restrained (Basement) Retaining Wall (IBC 2021)
Design restrained (basement) retaining walls to IBC 2021, ASCE 7-16 and ACI 318-19. An earlier code edition, kept for existing projects.