To calculate the weight of a square, simply enter the side size (for example, 40x40) and the length. The service takes into account GOST 2591 and GOST 8559, which eliminates errors.

GOST 2591 and GOST 8559: standards for steel squares

In Russia, the production of hot-rolled (GOST 2591-2021) and cold-formed (GOST 8559-75) squares is regulated by strict standards. For example, a 20x20 square according to GOST 2591 has a thickness tolerance of ±1 mm, and according to GOST 8559 - ±0.5 mm. These differences affect the weight of 1 meter of the profile.

Formula for calculating the weight of a steel square

Weight of steel square (kg/m) = (A² * ρ) / 1000

where:

A - side of the square in mm (for example, 40x40);
ρ - density of steel (7850 kg/m³).

For quick calculations, use the simplified formula:

Weight per meter = 0.00785 * A²

A 50x50 square weighs 0.00785 * 2500 = 19.625 kg/m.

Calculation examples for popular sizes

Size (mm)	Weight per meter (kg)
20x20	3.14
40x40	12.56
50x50	19.625
100x100	78.5

Features of calculating the weight of a square tube

The weight of a square tube depends on the wall thickness. For example, a 50x50 profile with a thickness of 5 mm is calculated by the formula:

(Perimeter * Thickness * ρ) / 1000

At a density of 7850 kg/m³: (200 * 5 * 7850) / 1,000,000 = 7.85 kg/m.

Why is it important to calculate weight accurately?

Errors in calculating the weight of 1 square lead to budget overruns or structural integrity violations. Use reliable calculators and cross-check with GOST tables - this will save up to 15% on metal costs.

Steel Square Weight Calculator