📍 Byron House, 4 Willow Drive, Sherwood Park, Annesley, NG15 0DP
Mon–Fri 08:00–17:00 📞 01623 687 660 ✉ sales@parksidesteel.uk.com
Free Engineering Tool

Steel Weight Calculator

Calculate the weight of steel bar per metre, per foot, or for a full order quantity. Covers round, hexagon, square, flat bar and cast iron in metric and imperial. Results in kg, tonnes and lbs.

Round Bar
Bright drawn and black round bar — EN grades and S355
Symmetrical racking aisle with large diameter black bar — Parkside Steel facility
Using density: 7.85 g/cm³
pcs
mm
Please enter a length
Results
Weight per metre
—kg/m
Weight per foot
—kg/ft
Total order weight
—kg
Total in lbs
—lb
ⓘ  All results are theoretical weights based on nominal dimensions and published material density. Actual weights may vary by ±2–3% due to dimensional tolerance and surface condition. For order confirmation weights, contact our sales team.
Material Densities
Carbon & alloy steel7.85 g/cm³
Grey cast iron (GJL-250)7.20 g/cm³
Stainless steel 304/3167.90 g/cm³
Aluminium 60822.71 g/cm³
Copper8.96 g/cm³
Brass8.50 g/cm³
Titanium grade 54.43 g/cm³
Formulae Used
// Round Bar W = π ÷ 4 × D² × ρ // Hexagon Bar W = (√3 ÷ 2) × A² × ρ // Square Bar W = S² × ρ // Flat Bar W = W × T × ρ // ρ = density (g/cm³ → kg/m) // D, A, S in mm → convert to m

W = weight (kg/m), D = diameter, A = across flats, S = side, ρ = density

Need This Steel Cut to Length?

Parkside operates 13 saws on site. One piece or thousands — standard tolerance −0 / +2mm, 2–3 day turnaround.

📞 01623 687 660 Get a Cutting Quote ►
Quick Reference Tables

Round Bar — kg / metre
Carbon & alloy steel (7.85 g/cm³)

Diameterkg/mkg/ft

Hexagon Bar — kg / metre
Carbon & alloy steel (7.85 g/cm³)

A/F Sizekg/mkg/ft

Square & Flat Bar — kg / metre
Carbon & alloy steel (7.85 g/cm³)

SizeProfilekg/m

How to Use This Calculator

Select your bar profile using the tabs at the top, then enter the diameter (for round bar), across-flats size (for hexagon), side dimension (for square), or width and thickness (for flat bar).

Enter the length of each piece and the number of pieces in your order. Select your material grade — the density adjusts automatically. Click Calculate to get weight per metre, per foot, total kg and total lbs.

The calculator works in both metric (mm/m) and imperial (inches/feet). Switch between them using the toggle at the top of the calculator.

Steel Weight Formula

Steel weight is calculated from the cross-sectional area multiplied by the length and the material density. For round bar, weight per metre = (π ÷ 4) × D² × density, where D is the diameter in metres.

For hexagon bar, the cross-section area is (√3 ÷ 2) × A² where A is the across-flats dimension. For square bar it is simply S², and for flat bar it is width × thickness.

All grades of carbon and alloy engineering steel — EN1A, EN3B, EN8, EN19, EN24, EN36, S355 — share the same density of 7.85 g/cm³. Grey cast iron is lighter at 7.20 g/cm³.

About Parkside Steel

Parkside Steel (Stockholders) Ltd has supplied engineering steel bar since 1977. We stock bright drawn and black round bar, hexagon bar, square bar, flat bar and cast iron bar in a comprehensive range of grades including EN1A, EN3B, EN8, EN19, EN24T, EN36, S355 and grey cast iron.

All stock can be cut to length on our 13 on-site saws to any length you require — one piece or thousands. Standard tolerance −0 / +2mm. 2–3 day turnaround. Call us on 01623 687 660 or email sales@parksidesteel.uk.com.