How to use it
- Enter axial load (kN).
- Enter yield strength (MPa).
- Click Calculate.
- Read required area (mm²) and side length (mm).
What it does – The Column Size Calculator takes your axial load and the steel’s yield strength, applies the AISC rule that allowable compressive stress is 0.6 × yield, and instantly returns the minimum cross‑sectional area and the square side length that will safely carry the load. Why it matters – Oversized columns waste material and cost; undersized columns risk buckling. Knowing the exact area lets you order the right steel shape and keep budgets tight. How to read the results – The Required Area (mm²) is the smallest total area the column must have. The Side Length (mm) assumes a square section, so a column with that side will meet the area requirement. You can compare the side length to standard profiles to decide if a square tube, plate, or built‑up section is most efficient.
Pro tips
- Add 5‑10 % extra area for fabrication tolerances.
- Round side length up to the nearest standard size.
- Check local code for minimum dimensions.
- Don’t forget to convert units if your load is in kN and strength in MPa.
Real-life examples
- A structural engineer sizing a new warehouse roof column.
- A contractor estimating steel for a parking garage support.
- A DIY homeowner reinforcing a garage door opening.
Case study
John, a small‑contractor, entered a 250 kN load and 250 MPa yield strength. The tool gave 25,000 mm² area and a 158 mm side length, letting him order the exact square tube and cut material cost by 12 %.