Calculate the weight of sheet, bar, flat, tube, hollow section, angle, channel, tee or H-beam (HEA, HEB) – in mild steel, 304 and 316L stainless, aluminium, copper or brass. The calculator works both ways: from dimensions and length it gives the mass, and from mass – the number of metres (or m² of sheet).
How do I calculate the weight of steel?
Mass = cross-section area × length × density. The area depends on the shape – for a tube it is the difference between the outer and inner circle, for an angle the sum of the legs minus the shared corner. The calculator does this automatically for 11 shapes – from sheet to H-beam.
For sheets there is a simple rule: 1 m² of sheet 1 mm thick weighs as many kilograms as the material density in g/cm³ – mild steel 7.85 kg, stainless 7.93 kg, aluminium 2.70 kg.
Metres to kilograms and kilograms to metres
Stockists often sell bars, tubes and sheets by weight, while your project is in metres. Choose the “I know the weight” mode and the calculator converts kilograms into running metres, the number of 6-metre lengths or square metres of sheet. Enter the price per kilogram to see the material cost and the price per metre.
H-beams – HEA and HEB
For HEA and HEB wide-flange beams from 100 to 300 you pick the size from the list and the calculator takes the dimensions from EN 10365 including the root radius – the mass matches mill tables. For welded or non-standard sections enter your own h, b, web and flange thickness. The calculator also gives the painting surface in m² per metre.
Inch pipes up to 10"
For a round tube you can pick an inch size from the list: threaded pipes from 1/8" (Ø 10.2 mm) to 10" (DN250, Ø 273 mm) and sanitary tubes from 1/2" to 6". The diameter fills in automatically – just enter the wall thickness.
Material densities
Structural steel 7.85 g/cm³, 304 stainless (1.4301) 7.93 g/cm³, 316L stainless (1.4404) 7.98 g/cm³, aluminium 2.70 g/cm³, copper 8.96 g/cm³, brass about 8.50 g/cm³. The actual weight may differ by a few percent due to thickness and dimensional tolerances.
How we calculate
Mass = cross-section area × length × material density. Sections: tube π/4 × (D² − (D − 2t)²), round bar π/4 × d², hex bar 0.866 × S², hollow section a × b − (a − 2t) × (b − 2t), angle t × (a + b − t), channel t × (h + 2b − 2t), tee t × (b + h − t), H-beam 2 × b × tf + (h − 2tf) × tw + (4 − π) × r². Sheet: 1 m² of 1 mm sheet weighs as many kilograms as the density in g/cm³ (e.g. 7.93 kg for stainless). Profiles are calculated as bent with constant thickness, without corner radii – the result may differ from manufacturer tables by 1–3%.
Frequently asked questions
How much does a metre of 50.8 × 1.5 mm stainless tube weigh?
About 1.84 kg. A 2" tube in 304 stainless with a 1.5 mm wall has a cross-section of about 232 mm², and a 6-metre length weighs about 11 kg.
How much does 1 m² of 1 mm stainless sheet weigh?
About 7.93 kg (304 steel). A 1000 × 2000 mm sheet 1 mm thick therefore weighs about 15.9 kg, and 2 mm thick about 31.7 kg.
Why does the result differ from the manufacturer's table?
Hot-rolled profiles have rounded corners and tapered flanges, and manufacturers give the weight from the standard. The calculator uses a constant-thickness profile without radii, so the difference is usually 1–3%.
How much does a metre of 10 mm steel bar weigh?
A 10 mm round bar in structural steel weighs about 0.617 kg/m, in stainless about 0.623 kg/m.
How many metres of tube are in 1 kg?
It depends on the diameter and wall – 1 kg of 50.8 × 1.5 mm stainless tube is about 0.54 m, and of 12 × 1 mm tube about 3.7 m. Enter the dimensions and the calculator gives the exact value.
How much does a metre of HEB 200 weigh?
About 61.3 kg/m (structural steel). HEA 200 weighs about 42.3 kg/m, and HEB 100 about 20.4 kg/m.
How much does a metre of 4 inch pipe weigh?
Threaded pipe 4" (DN100) ma Ø 114.3 mm – przy ściance 3.6 mm waży ok. 9.8 kg/m ze stali czarnej. Rura sanitarna 4" ma Ø 101.6 mm i przy ściance 2 mm waży ok. 5 kg/m ze stali nierdzewnej.
How much water does a tube hold?
For tubes and hollow sections the calculator gives the internal capacity in litres per metre – e.g. a 50.8 × 1.5 mm tube holds about 1.8 l per metre. Useful when calculating column packing or a condenser jacket.