Steel Bar Weight per Meter
Weight per meter of round, square and hexagon steel bar and round aluminum bar, from 5 to 100 mm.
The weight of a bar is its cross-section area times its density. This table does the arithmetic for the sizes in the stockroom: round, square and hexagon steel bar (the hexagon size is the distance across the flats), and round aluminum bar for comparison, from 5 to 100 mm.
The table
| Size d or across flats (mm) | Round steel (kg/m) | Square steel (kg/m) | Hexagon steel (kg/m) | Round aluminum (kg/m) | Round steel (lb/ft) | Round area (mm2) |
|---|---|---|---|---|---|---|
| 5 | 0.154 | 0.196 | 0.17 | 0.053 | 0.104 | 19.6 |
| 6 | 0.222 | 0.283 | 0.245 | 0.076 | 0.149 | 28.3 |
| 8 | 0.395 | 0.502 | 0.435 | 0.136 | 0.265 | 50.3 |
| 10 | 0.617 | 0.785 | 0.68 | 0.212 | 0.414 | 78.5 |
| 12 | 0.888 | 1.13 | 0.979 | 0.305 | 0.597 | 113.1 |
| 14 | 1.208 | 1.539 | 1.332 | 0.416 | 0.812 | 153.9 |
| 16 | 1.578 | 2.01 | 1.74 | 0.543 | 1.061 | 201.1 |
| 20 | 2.466 | 3.14 | 2.719 | 0.848 | 1.657 | 314.2 |
| 25 | 3.853 | 4.906 | 4.249 | 1.325 | 2.589 | 490.9 |
| 30 | 5.549 | 7.065 | 6.118 | 1.909 | 3.729 | 706.9 |
| 32 | 6.313 | 8.038 | 6.961 | 2.171 | 4.242 | 804.2 |
| 40 | 9.865 | 12.56 | 10.877 | 3.393 | 6.629 | 1256.6 |
| 50 | 15.413 | 19.625 | 16.996 | 5.301 | 10.357 | 1963.5 |
| 60 | 22.195 | 28.26 | 24.474 | 7.634 | 14.915 | 2827.4 |
| 75 | 34.68 | 44.156 | 38.24 | 11.928 | 23.304 | 4417.9 |
| 80 | 39.458 | 50.24 | 43.509 | 13.572 | 26.515 | 5026.5 |
| 100 | 61.654 | 78.5 | 67.983 | 21.206 | 41.429 | 7854 |
Source and notes: Computed from the cross-section area and a density of 7 850 kg/m3 for steel and 2 700 kg/m3 for aluminum (round bar: pi/4 d2; square: d2; hexagon: (sqrt(3)/2) s2 with s across flats). 1 kg/m = 0.671969 lb/ft. Rolled bar is within about 2 to 3 percent of these figures.
How to use this table
- Find the diameter or across-flats size.
- Read the weight per meter and multiply by the length to estimate the weight of a piece.
- Multiply by the price per kilogram for a quick material cost.
Worked example: a 3 m length of 25 mm bar
- Round steel: 3.853 kg/m × 3 m = 11.56 kg.
- Square steel of the same size weighs 14.72 kg (27 percent more, because the area is bigger).
- Round aluminum: 3.98 kg, about 34 percent of the steel.
Notes and cautions
- Steel is taken as 7 850 kg/m³ (carbon steel); stainless steel is about 2 percent heavier and aluminum about a third of the weight.
- Commercial bar is made to tolerances, so the actual weight is within about ±3 percent of the figure here.
- For plate, flat bar and other shapes use the steel and plate weight calculator.
Related tools and guides
FAQ
How do I find the weight of a round bar?
Area × length × density: π ÷ 4 × d² × L × 7 850 kg/m³. For a 10 mm bar that is 0.617 kg/m.
What is the weight of 1 inch round steel bar?
About 4.30 kg/m (2.67 lb/ft) for a 25.4 mm bar.
Sources
- Computed from the cross-section area and a density of 7 850 kg/m³ for steel and 2 700 kg/m³ for aluminum.
- Computed from the cross-section area and a density of 7 850 kg/m3 for steel and 2 700 kg/m3 for aluminum (round bar: pi/4 d2; square: d2; hexagon: (sqrt(3)/2) s2 with s across flats). 1 kg/m = 0.671969 lb/ft. Rolled bar is within about 2 to 3 percent of these figures.