Materials list
Collect the calculated products here and see the weight and cost of the whole order: how many kilograms you order, what the material costs and whether it all fits in the vehicle. The list stays saved in the browser, copies to Excel or prints, for example as an estimate for your customer, under your company name. The fields below are optional.
Values are theoretical: nominal section × material density. HEA/HEB/HEM/IPE sections are calculated from EN 10365 dimensions (root radius included); INP, UPN and UPE use the manufacturers’ tabulated area. Square and rectangular tubes are calculated with rounded corners: cold-formed per EN 10219 or hot-finished per EN 10210, your choice. The real weight may vary with rolling tolerances (usually ±4–10%).
Bar cutting optimization
Enter the pieces you need and find out how many full bars to buy, how to cut them with minimal waste and which offcuts remain.
For whole lists of pieces, with stock offcuts and angled cuts, use the cutting program. How to reduce waste: the cutting optimization guide.
Painting, priming and galvanizing
Surface and weight can be taken straight from the materials list. Paint consumption is calculated from the dry film thickness and the volume solids on the product data sheet.
Vopsea
Hot-dip galvanizing
Vopsea
Zincare
The zinc pick-up varies with steel composition (silicon, phosphorus) and thickness. Galvanizers usually invoice on the weight after galvanizing. The minimum coating thickness is given by EN ISO 1461.
Welding consumables
Estimate how much wire or how many electrodes you need, the arc time and the shielding gas consumption for a given weld length.
Values are estimates and include 10% reinforcement. Deposition efficiency and rate depend on wire diameter, current and position. For electrodes the stub end is also lost.
Converter and reference tables
Inch ↔ millimetres
Weight ↔ volume
Steel grade equivalents
Pipes: nominal size DN, inch and outside diameter
Sheet gauge in millimetres
Material densities
How to calculate steel weight
The principle is the same for any product: weight = section area × length × density. For steel the density is 7.85 g/cm³, so one metre of a section with a 1 cm² area weighs 0.785 kg.
Quick formulas for steel
- Round tube:
kg/m = (D − t) × t × 0.02466 - Square or rectangular tube, sharp corners:
kg/m = (2·(B + H) − 4t) × t × 0.00785 - Sheet:
kg/m² = thickness (mm) × 7.85 - Round bar and rebar:
kg/m = d² × 0.00617 - Square bar:
kg/m = a² × 0.00785 - Flat bar:
kg/m = width × thickness × 0.00785 - Hexagon bar:
kg/m = S² × 0.0068(S = across flats) - Equal angle:
kg/m ≈ t × (2a − t) × 0.00785
For another material, multiply the steel result by the density ratio: aluminium is about 2.9 times lighter (× 0.344), 304 stainless is 1% heavier (× 1.01).
Frequently asked questions
Why does the calculated weight differ from the scale?
Sections are rolled with tolerances. EN 10034 allows mass deviations of ±4% on HEA/HEB/IPE, and sheet is often delivered towards the lower thickness limit. Square tubes have rounded corners, which reduce the weight compared with sharp-corner calculation, which is why the calculator uses the EN 10219 radius.
What is the difference between HEA, HEB and HEM?
All are wide flange H beams. HEA is the light series (depth slightly below the section number), HEB the standard series (depth equal to the number up to 300) and HEM the heavy series, with much thicker flanges and web. For the same size, HEB is about 40% heavier than HEA.
UPN or UPE?
UPN has tapered flanges (the inside of the flange is sloped), UPE has parallel flanges, which makes bolted connections simpler. For the same depth, UPE is usually slightly lighter and wider.
What do S235 and S355 mean compared with OL37 and OL52?
They are the European (EN 10025) names for structural steels. The number is the yield strength in N/mm². The old Romanian OL37 (STAS 500) roughly matches S235JR, and OL52 matches S355J2. See the table in the Converter section.
How many 6 m bars do I need?
Use the Saw cutting tool on the site: enter the pieces and the program arranges them in bars so the offcut is as small as possible, also taking the saw kerf into account.
Can the results be used for structural design?
The calculator gives theoretical weights for estimating, quoting and transport. For structural design consult an engineer and the manufacturer’s data sheets.