Free Engineering Tool
Compute the gross weight of steel, aluminum, stainless steel, copper, brass and other metals for plates and sheets, round / square / hexagonal bars, rectangular flats, round and square tubes, angle bars and ring blanks. Enter the material, shape and dimensions — the calculator returns total weight, weight per piece, per meter and per foot, in both kilograms and pounds.
This is the tool our own workshop uses to size raw material orders before cutting. Because weight drives material cost, freight and press loading, a quick gross-weight check at the quoting stage keeps estimates honest — whether you are planning a small prototype batch or a production run of stamped housings. All results update live as you type, and you can switch between metric and imperial units on any field.
Fill in the dimensions above — the weight updates automatically as you type.
Material weight calculation determines the mass of metal based on its dimensions (length, width, thickness, diameter) and density. This is essential for structural engineering, manufacturing, shipping cost estimates, load calculations and material ordering. Different materials have different densities — steel is about 7,850 kg/m³, aluminum is 2,700 kg/m³, and copper is 8,960 kg/m³. By calculating volume from dimensions and multiplying by density, you get the weight you need for procurement, design and logistics.
Weight = volume × density. First compute the volume from the part's geometry — for a plate, volume = length × width × thickness; for a round bar, volume = π × radius² × length; for a tube, volume = π × (R² − r²) × length where R is the outer radius and r is the inner radius. Then multiply by the material density: mild steel ≈ 7,850 kg/m³ (490 lb/ft³), aluminum ≈ 2,700 kg/m³ (169 lb/ft³), copper ≈ 8,960 kg/m³ (559 lb/ft³). Keep every dimension in the same unit so the volume comes out clean — this calculator does the geometry and density lookup automatically for plates, bars, tubes and rings.
The universal formula is Weight = Volume × Density. For common shapes: Plate/Sheet = L × W × T; Round Bar = π × (D/2)² × L; Square Bar = S² × L; Hex Bar = (√3/2) × S² × L; Round Tube = π × [(OD/2)² − (ID/2)²] × L; Square Tube = (A² − (A−2T)²) × L; Angle = (2L×T − T²) × L; Ring = π/4 × (OD² − ID²) × T. Our calculator applies these automatically and shows the formula for the selected shape.
Mild steel ≈ 7,850 kg/m³ (490 lb/ft³), stainless steel 304 ≈ 7,930 kg/m³ (495 lb/ft³), stainless 316 ≈ 7,980 kg/m³ (498 lb/ft³), aluminum 6061 ≈ 2,700 kg/m³ (169 lb/ft³), aluminum 7075 ≈ 2,810 kg/m³ (175 lb/ft³), copper ≈ 8,960 kg/m³ (559 lb/ft³), brass ≈ 8,500 kg/m³ (531 lb/ft³), bronze ≈ 8,800 kg/m³ (549 lb/ft³), titanium ≈ 4,500 kg/m³ (281 lb/ft³), zinc ≈ 7,140 kg/m³ (446 lb/ft³), lead ≈ 11,340 kg/m³ (708 lb/ft³). Note that alloy composition shifts density slightly — for a precise quote, verify the exact grade.
Gross weight is the weight of the raw stock before any machining — what you order and cut. Net weight is the finished part weight after holes, cutouts, threads and machined features are removed. For material ordering and freight quotes you should always work from gross weight, then add a 5–10% allowance for cutting scrap, kerf loss and dimensional tolerances.
A standard 4 ft × 8 ft (1.22 m × 2.44 m) mild steel plate: at 3 mm thick it weighs about 70 kg (154 lbs), at 5 mm about 117 kg (258 lbs), at 10 mm about 234 kg (516 lbs), and at 20 mm about 468 kg (1,032 lbs). Use the calculator with Plate / Sheet shape, thickness in mm, length 2438 mm, width 1219 mm to get the exact figure for any thickness.
Because density is about one third: aluminum ≈ 2,700 kg/m³ versus steel ≈ 7,850 kg/m³. A part made from aluminum 6061 weighs roughly 2.9× less than the identical part in mild steel. That's why aluminum is preferred for weight-critical applications such as automotive brackets, enclosures and aerospace components — at the cost of lower strength and higher raw material price per kg.
After calculating the gross weight, multiply by 1.05 to 1.10 (a 5–10% allowance). For blanking and stamping parts, add the scrap skeleton between blanks; for machined parts, add the material removed. When in doubt, our engineers recommend 10% for small batches and 5% for optimized nesting. Send your drawing to shawn@balford.net and we'll confirm the exact stock size.
For standard mill stock, calculated weight typically matches actual weight within ±1–2% because mill tolerances and coatings are small. Accuracy drops for cast or forged parts, and for heavily machined components the net weight differs a lot from the gross weight. Always use measured dimensions for critical logistics calculations, and check with your supplier on actual mill tolerances for large orders.
Send your drawing to shawn@balford.net — our engineers will confirm material grade, gross weight, machining and pricing within 24 hours.