Square bar 50 × 50 in steel — 117.75 kg a piece
Square bar 50 × 50 weighs 117.75 kg. Its 2500 mm² section times a density of 7850 kg/m³ gives 19.625 kg/m, so 100 pieces come to 11775 kg and a tonne holds 8.
Only the section formula changes with shape
Plate and flat bar are thickness × width, square bar is side², round bar is π/4 × diameter². Tubes are the outside section minus the inside one: π/4 × (outside² − inside²) for round tube, outside² − inside² for box section, where the inside size is the outside less the wall on both faces, outside − 2t. Subtract the wall only once and you get a tube with half the wall and roughly half the weight — that factor of two is the single most common slip in this calculation.
- a²2500 mm²
- 2500 mm² ÷ 10⁶ × 7850 kg/m³19.625 kg/m
- Size
- 50 × 50 mm
- Section formula
- a²
- Cross-section
- 2500 mm²
- Weight per metre
- 19.625 kg/m
- Length of one
- 6 m
- Weight of one
- 117.75 kg
- 100 pieces
- 11775 kg
- Pieces per tonne
- 8
Nearby cells
Same shape, other sizes
Worth knowing
- Weight per metre (kg/m) is section in mm² ÷ 10⁶ × 7850 — only the section formula changes with shape.
- For plate, thickness × 7.85 is the weight per m²: 47.1 kg/m² at 6 mm, twice that at 12 mm.
- For tube, subtract the inside section from the outside one; the inside size is the outside less 2t.
- Doubling a dimension quadruples the section, while length is directly proportional to weight.
Common questions
Q. How much does one Square bar 50 × 50 weigh?
117.75 kg — 19.625 kg/m times its length. Ten pieces come to 1177.5 kg and a hundred to 11775 kg.
Q. How many pieces make a tonne?
8. That is 1000 divided by 117.75 kg, and 100 pieces weigh 11.775 t.
Q. Where does 19.625 kg/m come from?
The section is a², which gives 2500 mm²; convert that to m² and multiply by a density of 7850 kg/m³. With the dimensions in hand you get the same number without any table.