Box and Profile Weight Table and Its Calculation Formula; A Fast Pricing Tool

A customer asks how much a ۶-meter length of ۴۰ × ۸۰ box section with a thickness of ۲ میلی‌متر weighs. Unlike sheet, which only has length, width, and thickness, a box section is a closed, polygonal cross-section; that is why its weight formula is somewhat different, but once you learn it, it is just as fast and practical.

Box and Profile Weight Formula

The weight of each meter of box or profile by length, in kilograms, is equal to ۲ multiplied by (the sum of the two cross-section sides, in meters), multiplied by the thickness (میلی‌متر), multiplied by ۷.۸۵. For a square box such as ۴۰ × ۴۰, both sides are equal; for a rectangular box such as ۴۰ × ۸۰, you add the two different sides.

The perimeter of the closed cross-section is the main basis of the box and profile weight formula—not just a simple dimension.

Weight Table for Several Common Sizes

How to Use This Formula When Receiving a Shipment

Before settlement, calculate the theoretical total weight of the shipment using this formula and compare it with the weighbridge weight. A small difference due to the permitted tolerance is natural; a large difference that is consistently on the lower side is usually a sign that the thickness is less than what is written on the invoice.

Memorize this formula or keep it available; for quickly pricing non-standard sizes for customers that are not included in printed tables, it is the only tool that always works.

A Practical Note for Boxes with Non-Standard Thicknesses

Some manufacturers also offer intermediate thicknesses such as ۱.۸ or ۲.۲۵ میلی‌متر, which are not seen in standard market tables. For these cases, use this formula with the exact thickness on the factory invoice, rather than the closest rounded number in the table, so that the price calculation corresponds to the actual weight.