Flange Weight Calculator

The Flange Weight Calculator is a free online tool that helps engineers, fabricators, and students quickly estimate the weight of flanges based on their dimensions and material type. By entering the outer diameter (OD), inner diameter (ID), and thickness, along with selecting a material such as Mild Steel, Stainless Steel, Aluminium, or Copper, you can instantly calculate the approximate flange weight in kilograms (kg).

This tool is especially useful for mechanical engineers, piping designers, and fabrication professionals who need accurate weight data for cost estimation, transportation planning, or structural calculations. Built with precision and powered by the standard flange weight formula, it ensures accuracy and efficiency in every calculation.

How to Use the Flange Weight Calculator

Follow these simple steps to calculate flange weight online:

1. Enter Outer Diameter (OD) – Type the flange’s outer diameter in millimetres (e.g., 300 mm).
2. Enter Inner Diameter (ID) – Input the inner diameter (e.g., 150 mm).
3. Enter Thickness (t) – Provide the flange thickness (e.g., 20 mm).
4. Select Material Type – Choose the flange material (e.g., Mild Steel, Stainless Steel, Aluminium, etc.).
5. Click “Calculate” – The tool instantly displays the estimated flange weight in kilograms.
6. Click “Clear” – To reset the fields and start a new calculation.

Flange Weight Formula

The standard formula used to calculate flange weight is:

Weight (kg)=π4×(OD2−ID2)×t×ρ\text{Weight (kg)} = \frac{\pi}{4} \times (OD^2 – ID^2) \times t \times \rhoWeight (kg)=4π​×(OD2−ID2)×t×ρ

Where:

• OD = Outer Diameter (in meters)
• ID = Inner Diameter (in meters)
• t = Thickness (in meters)
• ρ (rho) = Material Density (kg/m³)
• π = 3.1416

Example Calculation

Let’s calculate the weight of a Mild Steel flange:

Given:

• Outer Diameter (OD) = 300 mm
• Inner Diameter (ID) = 150 mm
• Thickness (t) = 20 mm
• Density (ρ) = 7850 kg/m³

Step 1: Convert all dimensions to meters
OD = 0.3 m, ID = 0.15 m, t = 0.02 m

Step 2: Apply the formula Volume=π4×(0.32−0.152)×0.02=0.00159 m3\text{Volume} = \frac{\pi}{4} \times (0.3^2 – 0.15^2) \times 0.02 = 0.00159 \, m³Volume=4π​×(0.32−0.152)×0.02=0.00159m3 Weight=0.00159×7850=12.48 kg\text{Weight} = 0.00159 \times 7850 = 12.48 \, kgWeight=0.00159×7850=12.48kg

Result: The approximate weight of the flange = 12.48 kg

Creators

Rakesh Joshi