Steel Weight Calculator
ConstructionCalculate the weight of a solid steel bar in round, square, or rectangular cross-section. Enter dimensions, length, and quantity for instant weight in pounds.
1
Total Weight
68.06
Weight per Piece
68.06
What is a Steel Weight?
A Steel Weight Calculator determines the weight of a solid steel bar in round, square, or rectangular cross-section, based on its dimensions, length, and quantity. Because steel bar stock is priced and shipped by weight, and structural and machining calculations depend on accurate mass figures, knowing a bar's exact weight before ordering or fabrication is essential.
This calculator uses a fixed steel density (0.2836 lb per cubic inch) and supports three common bar profiles in one tool, so you don't need separate calculators for round, square, and rectangular stock. It complements the Steel Plate Weight Calculator for flat plate stock, and the Metal Weight Calculator for other metals like aluminum, brass, and copper.
How to use this Steel Weight calculator
- Select the Bar Shape — Round, Square, or Rectangular.
- Enter Dimension 1 in inches — the diameter for round bars, or the side length for square and rectangular bars.
- If you selected Rectangular, enter Dimension 2 for the second side length.
- Enter the Length in inches and set the Quantity for your order.
- Read the Total Weight result for your full order, and check Weight per Piece for a single bar's weight.
Formula & Methodology
The calculator computes cross-sectional area based on the selected shape, then multiplies by length and the density of steel: Round: Area = π × (Dimension 1 ÷ 2)² Square: Area = Dimension 1² Rectangular: Area = Dimension 1 × Dimension 2 Weight per Piece = Area × Length × 0.2836 lb/in³ Total Weight = Weight per Piece × Quantity Worked example (round): For a 1 in diameter round bar, 120 in long, quantity 1: Area = π × (1 ÷ 2)² ≈ 0.785 in². Weight per Piece = 0.785 × 120 × 0.2836 ≈ 26.72 lb. Total Weight = 26.72 lb.
Frequently Asked Questions
Steel bar weight is calculated by multiplying the cross-sectional area by the bar's length and the density of steel (0.2836 lb per cubic inch). The Steel Weight Calculator handles this automatically for round, square, or rectangular bars — just select your shape and enter the dimensions.
For a round bar, cross-sectional area equals π times the radius squared (radius being half the diameter), and weight per piece equals that area multiplied by length and the steel density of 0.2836 lb per cubic inch. This calculator applies that formula automatically when you select the Round shape option.
For a square bar, cross-sectional area is simply the side length squared. For a rectangular bar, area is the first side length multiplied by the second side length. In both cases, weight per piece equals that area multiplied by length and the steel density of 0.2836 lb per cubic inch.
This calculator uses a standard mild steel density of 0.2836 lb per cubic inch (about 7,850 kg per cubic meter), the widely accepted value for carbon and mild steel bar stock. Stainless or alloy steel will vary slightly from this figure, typically by less than 5%.
A 1 in diameter round steel bar weighs approximately 2.67 lb per linear foot, based on the standard steel density used in this calculator. This is a commonly referenced figure in fabrication and machining for quick length-to-weight conversions.
Select the Bar Shape — Round, Square, or Rectangular. Enter Dimension 1 (diameter for round, side length for square or the first side for rectangular), and enter Dimension 2 only if you selected Rectangular. Set the Length and Quantity, and the calculator returns the Total Weight and Weight per Piece.
The three shapes differ only in how cross-sectional area is calculated — round bars use a circle's area formula, square bars use side-squared, and rectangular bars multiply two different side lengths. Once area is known, the weight formula (area × length × density) is identical across all three shapes.
A round bar has less cross-sectional area than a square bar with the same outer dimension, since a circle inscribed in a square only covers about 78.5% of the square's area. This means a round bar weighs noticeably less than a square bar of the same diameter/side and length.
Steel bar stock is typically priced and shipped by weight, so an accurate total weight figure is essential for getting correct freight quotes and calculating material costs for a fabrication job. Multiplying total weight by your supplier's price per pound gives an accurate cost estimate before ordering.
The calculator supports bar dimensions from 0.1 in up to 24 in for diameter or side length, and lengths from 1 in up to 1,200 in (100 ft), covering everything from small precision stock to long structural bar and rod lengths.
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