Metal Weight Calculator
Calculate the weight of a rectangular metal plate or bar from its dimensions and material density.
Results
What is it?
Metal weight is calculated from the volume of the piece multiplied by the material's density. For rectangular sections (plates, flat bars, square bar), this is a simple length × width × thickness calculation. Knowing the weight is essential for structural design, freight quoting, and material ordering.
How to use
Enter the length, width, and thickness of your rectangular metal piece in millimetres, then select the material. The calculator converts the volume from mm³ to cm³ and multiplies by the material density (g/cm³) to give weight in kilograms and pounds.
Example scenario
A 1000 mm × 100 mm × 10 mm mild steel flat bar: Volume = 1,000,000 mm³ = 1,000 cm³. Weight = 1,000 × 7.85 / 1000 = 7.85 kg (17.3 lbs). Useful when calculating loads on shelving or checking freight weight limits.
Pro tip
Aluminium is approximately 1/3 the weight of steel for the same volume — a major factor in lightweight design. Stainless steel is slightly heavier than mild steel but is often used in thinner gauges. For non-rectangular cross-sections (rounds, tubes, angles), calculate volume separately and multiply by density.