// multi-utility computation suite · offline · instant · precise
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build.column-capacity Calculator
Calculates the design axial load capacity of a reinforced concrete column from cross-section dimensions, concrete strength, and steel ratio, applying ACI code reduction factors. Columns carry the entire vertical load path from roof to foundation — undersizing one is a structural failure mode.
Inputs
D
Distance across a circle through its centre. Always confirm units match the rest of the calculation.
Fc
Reference formula or conversion factor shown for context.
Fy
Reference formula or conversion factor shown for context.
Rho
Push or pull (N). F = ma. Net force determines acceleration. Account for all forces including gravity and friction.
Results
nominal capacity Pn (kN)
Sample size or count used in the calculation.
design capacity phiPn (kN)
pH of the solution. Below 7: acidic. 7: neutral. Above 7: basic (alkaline).
gross area Ag (mm^2)
The computed two-dimensional surface area.
steel area As (mm^2)
The computed two-dimensional surface area.
reinforcement ratio
The proportional relationship between two quantities.
ACI limits
Reference formula or conversion factor shown for context.