Column Load Calculator
Calculate the axial load capacity of a reinforced concrete column.
Estimates only — not professional financial, medical, legal or engineering advice. Read full disclaimer.
Calculating...
Result
Fill in the form and click Calculate to see your result here.
How it's calculated
Pu = 0.4 × fck × Ac + 0.67 × fy × Asc, where fck is the concrete grade, fy is the steel grade, Ac is the net concrete area and Asc is the longitudinal steel area.
Example
Example: Column Load Calculator
Inputs
- Column Width: 300
- Column Depth: 450
- Concrete Grade: 20
- Steel Grade: 415
- Steel Percent: 1
Outputs
- Axial Load Capacity: 1444.57
- Gross Area: 135000
- Steel Area: 1350
This example uses typical sample values. Adjust the inputs above to see how the results change for your own numbers.
About this calculator
The Column Calculator estimates the axial load-carrying capacity of a short, axially loaded RCC column using a simplified IS 456-style approach, based on the column's cross-section, concrete grade, steel grade and reinforcement percentage.
Frequently Asked Questions
fck is the characteristic compressive strength of concrete (e.g. M20 = 20 N/mm²), and fy is the yield strength of the reinforcement steel (e.g. Fe415 = 415 N/mm²).
Codes typically require longitudinal steel between 0.8% and 6% of the gross cross-sectional area; 1-2% is common for typical building columns.
No, this simplified formula applies to short, axially loaded columns only. Slender columns require additional buckling checks that this calculator does not perform.
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