The calculation, without hidden assumptions
Calculate theoretical mass for solid square bar from cross-sectional area and material density. This owner is for solid square stock—not square hollow section—and keeps theoretical, procurement and supplier-comparison values separate.
How to use this calculator
Enter the nominal side of the solid square bar.
Enter piece length and whole-piece quantity in metric or imperial units.
Use 7,850 kg/m³ for carbon steel or enter documented density for another material.
Optionally add procurement allowance, rate/kg, target mass or supplier kg/m.
Review substituted working and supplier variance before purchasing or logistics decisions.
Where people use it
- •Estimate mild-steel square bar mass.
- •Turn a square-stock cut list into batch weight and material cost.
- •Compare steel, stainless, aluminum, brass or another documented density.
- •Reverse a payload or purchase target into whole equal-length pieces.
- •Compare a supplier/table kg/m with nominal sharp-corner geometry.
25 mm steel square bar, 6 m × 10 pieces
Area = 25 × 25 = 625 mm². At 7,850 kg/m³, unit mass is 4.90625 kg/m. One 6 m piece is 29.4375 kg and 10 pieces are 294.375 kg before allowance.
What the result does not assume
- •This calculator models solid square stock; use Hollow Section Weight for SHS/square tube.
- •Results use nominal side and entered density.
- •Rolled corner radii, tolerances, coatings and alloy chemistry can change delivered mass.
- •Allowance is an explicit purchasing input, not a manufacturing or engineering standard.
- •Mass geometry does not establish strength, load capacity, lifting safety or code compliance.
Frequently asked questions
What is the square bar weight formula?+
For solid square stock, area = side². With side in millimetres, kg/m = side² × 10⁻⁶ × density in kg/m³.
How much does a 25 mm steel square bar weigh?+
At 7,850 kg/m³, a 25 mm solid square bar is 4.90625 kg/m, so a 6 m piece is about 29.44 kg.
Is square bar the same as square tube?+
No. Square bar is solid. Square tube or SHS has a hollow centre and needs outside dimensions plus wall thickness; use the dedicated Hollow Section Weight Calculator.
Can I calculate pounds per foot?+
Yes. Enter inches and feet if preferred; results include kg/m, lb/ft, kilograms and pounds.
Why can a supplier table differ from this result?+
Real bars can have corner radii and dimensional tolerances, and material density can vary. Enter supplier kg/m to quantify variance without replacing the theoretical result.
Can I use this for aluminum or stainless square stock?+
Yes when you enter a documented density for the actual alloy. Do not assume carbon-steel density for another material.
Semantic next steps
Continue the calculation
These links move to a different input, formula or project stage rather than a keyword variation of this page.
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MAXScanner keeps the formula and assumptions beside the result so you can verify the number before using it in a drawing, estimate, specification, worksheet or document. Where a supplier, manufacturer, drawing or applicable standard owns a requirement, that source remains authoritative.