Instant, accurate weight calculations for TMT bar, steel plate, MS pipe, angle, channel & beam. Pick a calculator below or use the all-in-one tool.
All sections: TMT bar, plate, pipe, angle, channel, beam. Multiple grades.
Open Calculator →TMT / RebarCalculate TMT rebar weight using d²/162 formula. All standard sizes.
Open Calculator →Plate / SheetCalculate MS plate weight by length, width & thickness.
Open Calculator →Multi-MetalWeight for 14 metals: steel, aluminium, copper, brass, titanium & more. 6 shapes.
Open Calculator →Sheet MetalConvert sheet metal gauge (7–30) to mm, inches & weight per m².
Open Calculator →HardnessConvert between Brinell, Rockwell C/B, Vickers & tensile strength.
Open Calculator →FinanceCalculate true cost of buying steel on credit including interest charges.
Open Calculator →Rebar / BBSCalculate rebar weight, number of bars & tonnes for TMT 6mm–40mm.
Open Calculator →PipeAll NB sizes 15mm to 200mm. Formula: (OD − WT) × WT × 0.02466.
Open Calculator →AngleEqual & unequal angles as per IS 808. Formula: (A + B − T) × T × 0.00785.
Open Calculator →I-BeamAll ISMB sizes 100–600 with section modulus Zxx & moment of inertia Ixx.
Open Calculator →ChannelAll ISMC channel sizes 75–400 with section dimensions per IS 808.
Open Calculator →Flat BarAll MS flat bar sizes. Formula: Width × Thickness × 0.00785.
Open Calculator →Square TubeAll SHS sizes 20–100mm. Formula: (Side − WT) × WT × 4 × 0.00785.
Open Calculator →Rect TubeAll RHS sizes 40×20 to 200×100. Formula: 2×(W+H−2×WT)×WT×0.00785.
Open Calculator →Round BarMS, SS 304/316, EN24, aluminium & brass. Formula: d²/162.2.
Open Calculator →Stainless SteelSS 304, 316 & 202 grades. Round bar, plate/sheet & pipe sections.
Open Calculator →Chequered PlateDiamond pattern plate 3–25mm. Formula: T × 7.85 × 1.05 (5% pattern).
Open Calculator →Scrap & MeltingModel scrap-to-steel yield by grade and furnace type. HMS 1, shredded, turnings & more.
Open Calculator →Scrap & MeltingFull cost waterfall from scrap to finished steel. Enter your own prices for every input.
Open Calculator →Steel weight calculators are specialised tools that compute the mass of steel sections based on their dimensions and material grade. Whether you are working with TMT rebar, mild steel plates, MS pipes, structural angles, channels or I-beams, these calculators apply the correct engineering formula so you get an accurate weight in kilograms or tonnes — instantly.
In construction and fabrication, steel is bought and sold by weight. A contractor estimating a residential slab needs to know the total TMT rebar weight to generate a Bill of Quantities. A fabricator cutting steel plates for a tank must calculate plate weight to verify the supplier's invoice. A structural engineer sizing an I-beam needs section weight to check dead-load assumptions.
Each section shape has its own formula. Round bars and TMT rebars use the well-known d²/162 shortcut. Plates use Length × Width × Thickness × 7.85 (dimensions in mm, result in kg). Pipes use (OD − WT) × WT × 0.02466. All of these formulas derive from the base density of mild steel: 7,850 kg/m³.
SteelMath's calculators handle the maths for you. Just select a section type, enter your dimensions, and get the result. We support multiple material grades — MS, Fe500, SS 304, SS 316, Aluminium and Copper — with automatic density correction. Results can be shared via WhatsApp, downloaded or printed.
Steel weight is calculated by multiplying the cross-sectional area of the section by its length and the density of steel (7,850 kg/m³). Different section shapes — round bar, plate, pipe, angle — each have their own simplified formula. SteelMath provides free calculators for every common section type.
The d²/162 formula is a shortcut to find the weight per metre of round steel bars and TMT rebars. You square the diameter in mm and divide by 162.2. For example, a 12 mm TMT bar weighs 12² ÷ 162.2 = 0.889 kg/m. The constant 162.2 comes from simplifying the full formula: (π/4) × d² × 7850 / 1,000,000.
Mild steel (MS) and TMT rebar have a density of 7,850 kg/m³ (7.85 g/cm³). Stainless steel SS 304 is slightly heavier at 8,000 kg/m³, and SS 316 is 8,027 kg/m³. Aluminium is much lighter at 2,700 kg/m³. SteelMath calculators automatically apply the correct density for the selected grade.
Accurate weight calculation is critical for estimating material costs, verifying supplier invoices, designing structural members, and planning transport logistics. Steel is typically purchased by weight (per kg or per tonne), so even small errors in calculation can lead to significant cost differences on large projects.