--- title: Steel Weight Calculator UK: Beams, Angles, Hollow Sections | Koyda url: https://www.koyda.com/steel-weight-calculator/ description: Free steel weight calculator for UK sections: UB, UC, PFC, angles, SHS, RHS, CHS, plate and flat bar. Enter length and quantity; add a rate per tonne for a material cost. last_modified: 2026-10-11 publisher: Koyda Ltd, Units 27–29 Jesmor Farm, St Piers Lane, Lingfield, Surrey RH7 6PN. 07753 213617, joe@koyda.com --- Free tool · Reference # Steel Weight Calculator Work out the weight of UK steel beams, columns, channels, angles and hollow sections, plus plate and flat bar. Add your own rate per tonne for a rough material cost. Quick answer Steel weight = mass per metre × length × quantity. For example, a 203 × 133 × 25 UB is 25.1 kg/m, so four 6 m lengths weigh 602.4 kg. For plate or flat bar, weight = length × width × thickness × 7,850 kg/m³. Add your own rate per tonne to see a material cost. Cite this: Koyda Ltd, “Steel Weight Calculator”, https://www.koyda.com/steel-weight-calculator/, reviewed 10 October 2026. Calculator ## Steel weight calculator Pick a section and size, enter the length and quantity, and get the total weight. Plate and flat bar are worked out from their dimensions at 7,850 kg/m³. * Section weight = mass per metre × length × quantity * Plate or flat bar weight = length × width × thickness × 7,850 kg/m³ × quantity A 305 × 165 × 40 UB is 40.3 kg/m, so four 6 m lengths weigh 40.3 × 6 × 4 = 967.2 kg. A 10 mm plate 1,000 × 500 mm weighs 1.0 × 0.5 × 0.01 × 7,850 = 39.25 kg. Weights are nominal and exclude coatings, plates and fittings. Weight calculatorkg The calculator needs JavaScript. Use the mass per metre from the table: weight = mass × length × quantity. Steel weight calculation WWW.KOYDA.COM/STEEL-WEIGHT-CALCULATOR · Steel weight calculation Total weight Weights are nominal, from mass per metre in the Koyda steel section tables (plate and flat bar at 7,850 kg/m³). They exclude coatings, plates, fittings and tolerances. Any price is the user's own rate per tonne × weight: a material estimate only, subject to confirmation, excluding cutting, fabrication, finishes and delivery unless stated. Reference only. Values are nominal figures for the standard UK section ranges. Check them against current manufacturer data, and have a structural engineer confirm sizes before you use them in design. Koyda Ltd accepts no liability for decisions based on these tables. Need it cut, drilled or fabricated? Send your drawings for a price. Koyda Ltd, Units 27-29 Jesmor Farm, St Piers Lane, Lingfield, Surrey RH7 6PN joe@koyda.com · 07753 213617 · www.koyda.com · Mon-Fri 07:00-17:00 New · Free tool ## Pricing a whole job? Steel Quote Builder List every beam, column, angle and box section with its cut length, get the total weight, a cutting plan into stock lengths with the offcuts, and a supplier enquiry or customer quotation as a PDF. [Open the quote builder →](https://www.koyda.com/steel-quote-builder/) More free tools: [beam span and load checker](https://www.koyda.com/beam-span-checker/) · [lintel and padstone helper](https://www.koyda.com/lintel-and-padstone-helper/) · [paint and galvanising area calculator](https://www.koyda.com/steel-paint-area-calculator/) · [delivery and lifting check](https://www.koyda.com/steel-delivery-check/) Use the tables and calculator offline Install the Koyda app: section tables, weight calculator, CSV and PDF downloads, even without signal on site. [How to install the app →](https://www.koyda.com/app/) Install app× Section tables ## Full dimensions and properties The calculator uses the mass per metre from our steel section tables. Each table has dimensions, area, I and W, a diagram and a CSV download. [All steel section tables →](https://www.koyda.com/steel-section-tables/) * [Universal beams (UB)](https://www.koyda.com/steel-section-tables/universal-beams/) * [Universal columns (UC)](https://www.koyda.com/steel-section-tables/universal-columns/) * [Parallel flange channels (PFC)](https://www.koyda.com/steel-section-tables/parallel-flange-channels/) * [Equal angles (EA)](https://www.koyda.com/steel-section-tables/equal-angles/) * [Unequal angles (UA)](https://www.koyda.com/steel-section-tables/unequal-angles/) * [Square hollow sections (SHS)](https://www.koyda.com/steel-section-tables/square-hollow-sections/) * [Rectangular hollow sections (RHS)](https://www.koyda.com/steel-section-tables/rectangular-hollow-sections/) * [Circular hollow sections (CHS)](https://www.koyda.com/steel-section-tables/circular-hollow-sections/) Questions ## Frequently asked questions How do I calculate the weight of a steel beam? Multiply the mass per metre by the length and the number of pieces. A 203 × 133 × 25 UB is 25.1 kg/m, so four 6 m lengths weigh 25.1 × 6 × 4 = 602.4 kg. How do I calculate the weight of steel plate? Multiply length × width × thickness in metres by the density of steel, 7,850 kg/m³. A 1,000 × 500 × 10 mm plate weighs 1.0 × 0.5 × 0.01 × 7,850 = 39.25 kg. Is the cost a quote? No. The cost is your rate per tonne multiplied by the weight. It covers material only, not cutting, fabrication, finishes, delivery or VAT. Send your drawings for a fabricated price. ## Reference only Reference only. Values are nominal figures for the standard UK section ranges. Check them against current manufacturer data, and have a structural engineer confirm sizes before you use them in design. Koyda Ltd accepts no liability for decisions based on these tables.