022-66337137 [email protected]

In the construction industry, steel is often priced per unit weight, similar to other raw materials like gravel, sand, and concrete. This pricing method ensures consistency across the market due to the availability of steel in various types, shapes, and sizes. Understanding the weight of steel is crucial for accurate pricing and cost estimation.

Furthermore, calculating the total weight of steel products is beneficial, especially during transportation. Purchasing in bulk allows for cost savings by optimizing delivery and logistics, avoiding multiple trips for small quantities. Additionally, considering that steel can be quite heavy in large volumes, calculating steel weight is essential in designing structures to ensure structural integrity and safety.

In the all metals industry, you need to understand the complexities of calculating the weight of steel bars. Understanding steel weight formula is crucial for accurate cost estimates and project planning. Our blog explores different steel weight calculation formulas by introducing steel unit weight calculators and stainless steel material weight calculators. These tools will help to determine the weight of steel components accurately, considering factors like composition and properties.

What are the Steel Products?

Steel products encompass a wide range of items manufactured from steel, such as structural components, machinery parts, tools, appliances, vehicles, and construction materials. These products are utilized across various industries and applications, including infrastructure development, manufacturing, transportation, and consumer goods.

Types of Steel Products:

  • Structural Steel: These are the building blocks! I-beams, channels, and plates are all structural steel shapes used to create the skeletons of buildings, bridges, and other large structures.
  • Stainless Steel Sheet Metal: This is thin and flat steel, often used for roofing, siding on buildings, car parts, and appliances.
  • Pipes and Tubes: These come in various diameters and thicknesses, used to transport liquids, gases, and even protect electrical wires.
  • Steel Bars and Rods: Solid or round steel bars are used for construction projects, railings, and even bolts.
  • Wire: Thin, flexible steel wires are used in everything from fences and cables to springs and even guitar strings!

The Unit Weight of Steel

The unit weight of any substance represents its mass or weight per unit volume ratio, measured in pound/ft, gm/cm, kg/cm, or kg/m. This value varies based on material composition and properties, indicating its heaviness or lightness.

The weighted density of steel, or unit weight of steel, is the weight-to-volume ratio, a steel weight calculation formula typically expressed in kilograms per cubic meter (kg/m³). For mild steel, the unit weight is about 7850 kg/m³ or 7.85 g/cm 3 or 78.5 kN/m³ or 489.84 lb/ft³. Steel weight can be stated in kilograms, tonnes, or pounds.

Steel unit weight calculators, stainless steel weight calculators, and SS weight calculators are tools used to determine the weight of steel and stainless steel components based on their dimensions and material properties.

How to Calculate Steel Weight?

The formula used to calculate the unit weight of steel bars is D²/162. Where, D = Dia. Of steel bars, 162 is a constant value.

Derivation of D2/162 Formula

Consider a steel bar with a diameter of D and a length is L.

Weight of Steel Bar (W) = Unit Weight of Steel Bar (γ) x Volume (V)

W = γ x V

W = πD²/4 x γ (V = πD²/4)

As known that Steel unit weight is about 7850 kg/m3 (γ)

W = πD²/4 x 7850

Here, D is steel diameter in mm, and the density of steel is in kg/m3. To make a constant value in the same unit we will convert Dia. Of steel in mm to m.

D² mm / 1000²

W = π/4 x D²/1000² x 7850

W = D²/162.28 kg/m

W = D²/162 kg/m

Steel Unit Weight

6 mm0.222 kg0.67 kg
8 mm0.395 kg0.120 kg
10 mm0.617 kg0.188 kg
12 mm0.89 kg0.270 kg
16 mm1.58 kg0.480 kg
20 mm2.47 kg0.751 kg
25 mm3.86 kg1.174 kg
32 mm6.32 kg1.925 kg

Stainless Steel Plate & Sheet Weight Calculation

The formula to calculate the weight of sheet metal is simple: Weight (lbs) = Length (in) x Width (in) x Thickness (in) x Density (lb/in³). For instance, if you have a 1/4″ thick steel plate measuring 6″ x 8″, the weight can be calculated as follows: 6″ x 8″ x 0.25″ x 10.2 lb/in³ = 97.6 lbs.

Weight of Steel Beams and Structures

The weight of steel beams and structures can vary widely depending on their dimensions, type of steel used, and design specifications. Generally, the weight of a steel beam or structure is determined by its volume (length x width x height) multiplied by the density of steel, typically around 7.85 grams per cubic centimeter (g/cm³) or 7850 kilograms per cubic meter (kg/m³).

To calculate the weight of a steel beam or structure, you can use the following formula:

Weight (kg)=Volume (m³)×Density of Steel (kg/m³)

Weight (kg)=Volume (m³)×Density of Steel (kg/m³)

For example, if you have a steel beam with dimensions of 10 meters (length) x 0.3 meters (width) x 0.5 meters (height) and the density of steel is 7850 kg/m³, the weight can be calculated as follows:

Volume=Length×Width×Height=10 m×0.3 m×0.5 m=1.5 m³


Weight=1.5 m³×7850 kg/m³=11775 kg


This calculation provides an estimate of the weight of the steel beam or structure in kilograms. Keep in mind that for more complex structures or beams with varying dimensions, the calculation may require more detailed measurements and considerations.

Calculating weight of Steel Bar

The weight of steel bars and shapes depends on their dimensions, type of steel used, and specific shape (e.g., round bars, square bars, I-beams, etc.). Generally, the weight of a steel bar or shape can be calculated using the formula:

Weight (kg)=Volume (m³)×Density of Steel (kg/m³)

Weight (kg)=Volume (m³)×Density of Steel (kg/m³)

This calculation provides an estimate of the weight of the round steel bar in kilograms. Similarly, you can calculate the weight of other steel shapes and bars using appropriate formulas for their respective volumes and densities.

Weight Calculation for SS Pipe

The weight of a stainless steel (SS) pipe can be calculated using the following formula:

Weight (kg)=Volume (m³)×Density of Stainless Steel (kg/m³)

Weight (kg)=Volume (m³)×Density of Stainless Steel (kg/m³)

The volume of a pipe can be calculated using the formula for the volume of a cylinder:

Volume (m³)=�×(Outer Diameter 2)2×Length


Calculating the precise weight of steel can be complex, depending on the type, such as plate or sheet metal, beams or structures, bars or shapes. However, with these helpful formulas, you’ll find it easier to determine the weight of your materials. Whether you’re tackling small projects involving sheets or large-scale projects using bars and shapes, knowing how to accurately calculate steel weight can streamline your project planning and lead to cost savings. Additionally, consider incorporating tips on optimizing steel usage and minimizing waste in project planning to enhance the content.

Connect with us now for your business requirements.

WhatsApp chat
Call Now