As we know, stainless steel is a wide used material due to their high strength and excellent corrosion resistance, there are varieties of stainless steel grade to choose depending on use, these grades consist of different chemical compositions, such as Nickel, Chromium, Manganese, Molybdenum, Silicon, Titanium, Copper, Carbon, Nitrogen.

Alloy content determines** density of stainless steel**, some grades have the same densities, some not the same, so when we calculate weight of stainless steel, they have different weight in the same size, for example, 304 and 316 stainless steel are not the same weight in the same size.

## How To calculate Stainless Steel weight?

There are some factors must be considered to calculate stainless steel weight.

- Shape
- Size
- Density

These are common stainless steel shapes **Weight Calculation Formula**.

## Tube / Pipe

Round shape:** W = (OD-T) x T x 0.0031416 x Density**

Square shape: **W = (OD x 4 / 3.14 -T) x T x 0.0031416 x Density**

Rectangular shape: **W = ((OD1+OD2) x 2 / 3.14 -T) x T x 0.0031416 x Density**

Oval shape: **W *** = (*(OD of Oval

**-T) x T x 0.0031416 x Density**

Elliptical Circumference = 2× 3.1415 × b + 4 × (a – b)

a = the long semi-axis (half of the long axis)

b = the short semi-axis (half of the short axis)

OD of Oval/Elliptical Tubing = Oval / Elliptical Circumference/3.1415

## Plate / Sheet

**W = T x Width (m) x Density**

**Round Bar**

**W = 0.0007854 x O.D. (mm) x O.D. (mm) x Density**

**Flat Bar**

**W = 0.001 x Width(mm) x T (mm) x Density**

**Hexagon Bar**

**W = 0.000866 x I.D. (mm) x I.D. (mm) x Density**

**Square Bar**

**W = 0.001 x Width (mm) x Width (mm) x Density**

Where:**W** = Theoretical Weight, in kg per meter**OD** = outside Diameter (mm)**T** = Wall Thickness (mm)**Density**: g/cm³

**NOTE**: the weight is **Theoretical Weight**, because these shapes are not exact sizes, they have tolerances in the manufacturing process.