# The Weight Formula for Steel

If you’re in the metals industry, you know that there are a lot of factors to consider when it comes to calculating the **weight of steel**. *Knowing the weight of steel is an important part of any project* because it allows you to accurately estimate costs and plan accordingly. In this blog post, we’ll take a look at the *various formulas for calculating the weight of steel*.

The unit weight of any substance is defined as the mass or weight per unit volume ratio. It is commonly measured in pound/ft, gm/cm, kg/cm, or kg/m, for example.

The unit weight of materials varies depending on their composition and the properties of their constituent materials. It indicates the heaviness or lightness of the material.

## The unit weight of steel

The weighted density of steel, or **unit weight of steel**, is the ratio of the weight of steel to its per unit volume. **Steel weight calculator formula** is typically expressed in kilograms per cubic meter (kg/m3). The unit weight of a mild steel plate or rolled steel is **approximately 7850 kg/m3** or 7.85 g/cm3 or 78.5 KN/m3 or 489.84 lb/ft3. Steel weight is typically expressed in kilograms, tonnes, and pounds.

## How to calculate weight of steel?

Weight = Density × Volume (volume = Area × Length)

Example: Diameter of bar = 10mm and Length = 1 meter

Area of circular bar = p/4 × d^{2 }

^{ }= 3.14/4 × 10^{2 }

= 78.5mm^{2}

Volume = Area × Length

= 78.5 × 1000 (1 meter = 1000mm)

= 78500 mm^{3}

** Unit Weight of steel bar for 10mm =** (7850/1000 × 1000 × 1000) × 78500

= **0.616kg/m **(1 kg/m^{3} = 0.000000001 kg/ mm^{3})** **

## Formula To Calculate the Weight of Steel Bars

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

Unit Weight Of Steel |
||

Size |
Kg/m |
Kg/feet |

6 mm | 0.222 kg | 0.067 kg |

8 mm | 0.395 kg | 0.120kg |

10 mm | 0.617 kg | 0.188 kg |

12 mm | 0.89 kg | 0.270 kg |

16 mm | 1.58 kg | 0.480 kg |

20 mm | 2.47 kg | 0.751 kg |

25 mm | 3.86 kg | 1.174 kg |

32 mm | 6.32 kg | 1.925 kg |

## The Weight of Steel Plate and Sheets

The **weight formula for sheet metal** is fairly straightforward. *The formula is as follows: Weight (lbs) = length (in) x width (in) x Thickness (in) x density (lb/in^3).* For example, let’s say you have a piece of 1/4″ thick steel plate that measures 6″ x 8″. To calculate its weight, use this formula: 6″ x 8″ x 0.25″ x 10.2 lb/in^3 = 97.6 lbs.

## The Weight of Steel Beams and Structures

*Calculating the weight of steel beams and structures can be more complicated than calculating plate or sheet metal*, since there are more variables to consider such as beam size, shape, orientation, etc. Generally speaking, most professionals use a method called “**handbook calculation**,” which takes into account all variables related to the structure’s design. This method is often used when designing bridges or other large-scale projects involving steel beams and structures.

## The Weight of Steel Bars and Shapes

For calculating the **weight of bars and shapes** made from steel, use this formula: *Weight (lbs) = length (ft) x width (ft) x thickness (ft) x density (lb/ft^3)*. For example, let’s say you have a piece of 4″ square bar stock that measures 8′ long. To calculate its weight using this formula, you would do the following math: 8′ x 4′ x 0.33′ ft^3 x 490 lb/ft^3 = 781 lbs.

## The Weight of Steel Pipes

*Many factors determine the weight of a steel pipe, including its length, diameter, and wall thickness. Although some basic calculations can be used to estimate the weight of a steel pipe, it is best to use the Weight formula for Steel pipes to obtain more accurate results. The Weight formula for Steel pipes states that: W = 0.02466 x D^2L / 10202, where “W” is the weight in kilograms per meter (kg/m), “D” is the outside diameter of the pipe in millimeters (mm), and “L” is its length in meters (m).*

## Conclusion:

Calculating the exact** mass of steel** can be tricky depending on what type it is – plate or sheet metal, beams or structures, bars or shapes – but with these handy formulas, you should now have an easier time figuring out how much your materials weigh! Whether you’re working on small projects with sheets or large-scale projects with bars and shapes – understanding *how to properly calculate steel weight *can save time and money in your project planning process!

## FAQs

### 1. What is the unit weight of steel?

The unit weight or **density of steel in kg/m3** is **7850kg/M3.**

### 3. What is the formula for the weight calculation of steel bars?

** **The formula for weight calculation of steel bars = **d ^{2}/162 kg/m**

### 4. What is the weight of the 12mm steel bar?

8mm = 0.396 kg/m

10mm = 0.619 kg/m

12mm = 0.888 kg/m

16mm = 1.58 kg/m

** 5. What is the weight of the 8mm steel Plate?**

The weight of an 8mm steel plate can vary depending on the dimensions and type of steel used. As a general estimate, an 8mm steel plate weighs approximately 62.8 kg/m² or 12.86 lb/ft².

### 6. Formula to Calculate Steel Quantity

The formula to calculate the quantity of steel required for a project depends on various factors such as the type of structure, design requirements, and engineering specifications. However, a commonly used formula to estimate the quantity of steel is:

**Quantity of Steel = (Length of Steel Bar * Number of Bars * Weight of Steel per Unit Length)**

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