Flat Bar Weight Calculator
Weight of flat bar from width and thickness — all common metals
Flat bar weight is the simplest of all: a solid rectangular cross-section, so weight = width × thickness × length × density. This calculator uses the exact density of your chosen alloy, so steel, stainless, aluminum and brass flat bar all read correctly.
A 50×10 mm steel flat bar is about 3.93 kg/m; the same in aluminum is roughly 1.35 kg/m. Flat bar is sold by width × thickness, so a "50×10" is 50 mm wide and 10 mm thick — enter those two numbers and your length for the total.
Frequently Asked Questions
How do I calculate flat bar weight per meter?
Weight per meter = width × thickness × density. A 50×10 mm steel flat bar: 500 mm² × 7.85 g/cm³ ≈ 3.93 kg/m.
What does 40×5 mm steel flat bar weigh?
About 1.57 kg per meter. A 6-meter length is roughly 9.4 kg.
How much lighter is aluminum flat bar than steel?
About one third of the weight for the same size, because aluminum density (~2.70 g/cm³) is roughly a third of steel (7.85 g/cm³).