Steel Weight Calculator
Estimate the weight and cost of various steel shapes like bars, plates, and pipes.
Project Details
Quantity & Cost
Total Weight
0.00 kg
Estimated Total Cost
₹0.00
Estimate the weight and cost of various steel shapes like bars, plates, and pipes.
Total Weight
0.00 kg
Estimated Total Cost
₹0.00
This steel weight calculator gives the weight of round bars, pipes, square or rectangular bars and hollow sections, and plates: choose the shape, enter the dimensions and number of pieces, and it multiplies the volume by a steel density of 7850 kg/m³. For a round bar this equals D²/162 kg per metre, with D in mm. Add a price per kg (or per lb) to estimate the cost.
In construction, manufacturing, and engineering, the weight of steel components matters for ordering material, estimating cost and planning transport. This guide explains how steel weight is calculated and how to use the online steel calculator.
Follow these steps:
The calculation for the weight of any object is based on a simple formula:
Weight = Volume × Density
The first step is to calculate the volume of the steel shape. The density of steel can vary slightly depending on its composition, but a standard value used for most calculations is 7850 kg/m³ (or approximately 490 lbs/ft³). Our calculator uses this standard density.
For a solid cylinder like a rebar or round bar, the volume is:
Volume = π × (Diameter / 2)² × Length
Our steel bar weight calculator uses this formula to find the volume and then multiplies it by the density to get the weight. With the diameter D in mm, this works out to Weight per metre ≈ D² / 162 kg; for example, a 12 mm bar weighs about 144 / 162 = 0.89 kg per metre.
For a hollow pipe, you must calculate the volume of the outer cylinder and subtract the volume of the inner hollow cylinder.
Volume = [π × (Outer Diameter / 2)² - π × (Inner Diameter / 2)²] × Length
The inner diameter is simply the outer diameter minus twice the wall thickness.
For a solid square or rectangular bar:
Volume = Length × Width × Height
For a hollow section, enter the wall thickness: the calculator subtracts the inner box, (Width − 2 × Wall) × (Height − 2 × Wall) × Length. It assumes sharp corners, so real hollow sections with rounded corners weigh slightly less. Enter 0 as the wall thickness for a solid bar.
This is a straightforward calculation for a rectangular prism (length and width in m or ft, thickness in mm or in). Our MS plate weight calculator uses:
Volume = Length × Width × Thickness
This calculator uses a standard density for mild steel of 7850 kg/m³ (or 490 lbs/ft³). While different steel alloys have slightly different densities, this value is a widely accepted standard for general engineering and construction calculations.
TMT bars are a type of round bar. To calculate their weight, select "Round Bar" from the shape menu, enter the bar's nominal diameter (e.g., 8mm, 10mm, 12mm) and its total length. The result follows the D²/162 kg per metre rule (about 0.395 kg/m for 8 mm, 0.617 kg/m for 10 mm and 0.888 kg/m for 12 mm). Actual bars can differ slightly from the nominal weight within the tolerance allowed by the product standard.
Yes, this tool is free to use, with no limits. It runs in your browser.
Our calculator covers the most common shapes. For more complex shapes like I-beams or angles, you would need a more specialized calculator or engineering software, as their cross-sectional areas are more complex to calculate.
Our Steel Weight Calculator estimates the theoretical weight and cost of the most common steel shapes from their dimensions and a density of 7850 kg/m³. Real pieces vary slightly with the alloy, rolling tolerances and corner radii, so use the result for estimating and ordering, and check the supplier's section tables when exact weights matter.