Metal Weight Calculator
Find the weight of steel, stainless, aluminium, copper and other metal plates, bars, tubes and pipes.
About the Metal Weight Calculator
Choose the metal and the shape (plate, round bar, square bar or tube), enter the dimensions in millimetres, the length and the quantity. The calculator gives the total weight in kilograms and pounds and the weight per metre.
Weight = cross-sectional area × length × density. Typical densities: carbon steel 7,850 kg/m³, stainless steel about 8,000, aluminium 2,700, copper 8,960 and brass about 8,500. Alloys vary by a few percent, so use the supplier's figure for critical work.
The formula
Mass = area × length × density
Worked example
A 20 mm round steel bar, 6 m long
- Area: π × 0.02² ÷ 4 = 0.000314 m²
- Per metre: 0.000314 × 7,850 = 2.466 kg
- 6 m bar: 14.8 kg; a 1,000 × 2,000 × 10 mm plate weighs 157 kg
Questions people ask
Why does my steel table differ slightly?
Tables round densities and may use nominal sizes.
Pipe weight per metre?
π/4 × (OD² − ID²) × density.
How heavy is a sheet of 1 mm steel?
7.85 kg per square metre.