Steel Plate Weight Calculator — m, kg
How to use this calculator
Pick a plate shape, enter dimensions with the m/cm/mm unit dropdown, choose the alloy and thickness, and set the quantity. Carbon steel weighs 7.85 kg/m² per mm of thickness (7 850 kg/m³ × t). Use it to price laser/plasma-cut blanks, base plates, gussets and shim stock to EN 10025 / EN 10029 before ordering.
Materials — Carbon steel S235/S355 (7 850 kg/m³), Stainless 304/316 (8 030 kg/m³), Aluminum 6061 (2 710 kg/m³), Copper (8 960 kg/m³).
Cost — enter price per kg (mill basis) or a flat price per finished plate, and select your currency.
Saved Calculations
| Time | Shape | Material | Area m² | kg/plate | Total kg | Cost |
|---|
How to Calculate Steel Plate Weight (Metric)
Weight comes straight from density: a 1 mm carbon-steel plate weighs 7.85 kg per square metre (7 850 kg/m³ ÷ 1000). Multiply by area and thickness to size a base plate, gusset, bearing plate or stiffener, then add a 5–10% allowance for cut kerf and edge prep waste when buying raw stock. For connection design pair this with the bolt pattern calculator and confirm member sizes with the steel beam weight calculator or steel column calculator.
How to use it
Select rectangle, circle, triangle or ring, enter the governing dimensions in m, cm or mm, set thickness, and choose the alloy. Weight per plate and total weight (kg and tonnes) update on every input change; toggle Cost to price by the kilogram or by the finished plate in your currency.
Material densities
Carbon steel S235/S355: 7 850 kg/m³. Stainless 304/316: 8 030 kg/m³. Aluminum 6061: 2 710 kg/m³. Copper: 8 960 kg/m³. Values follow EN 10025 / Eurocode 3 references.
Formulas
Rectangle A = L × W. Circle A = π × (D/2)². Triangle A = ½ × B × H. Ring A = π × ((D₀/2)² − (Dᵢ/2)²). Volume = A × thickness (metres). Weight = Volume × density; total = weight × quantity.
FAQ
Why is my plate heavier than the table? Hot-rolled plate is supplied to EN 10029 thickness tolerance and can run over nominal; treat the result as a minimum ordering weight. Does this include holes or copes? No — it is the gross blank weight; deduct large openings separately. Working in imperial? Use the imperial plate weight calculator. For embedded plates in concrete see the concrete beam calculator and rebar calculator.
Ordering tips
Mill-direct S235/S275 in 2025 runs about €1.20–1.80/kg for 6–25 mm carbon plate, €4–7/kg for 304/316 stainless, and €5–8/kg for 6082 aluminium — stockholder cut-to-size pricing is 30–60% higher. The biggest takeoff mistake is sizing by net blank area without adding 5–10% for plasma kerf and offcut drop, and ignoring that EN 10029 plate ships in 2000×1000, 2500×1250, 3000×1500 or 6000×2000 mm sheets — a 2100×1100 mm part forces the next sheet up. Plate over 30 mm is normally S275J2/S355J2 to EN 10025-2 with Charpy testing; above 100 mm thick (or with restrained T-joints) check EN ISO 17640 NDT and post-weld stress relief. Cross-check connection design with the bolt pattern calculator and members with the steel beam weight calculator.
