What is a UPN channel section?

UPN (formerly U-section per DIN 1026) is the standard European parallel-flange C-channel profile. The flanges are parallel (not tapered), making them easy to bolt and weld. Sizes run from UPN 30 to UPN 400, defined by the web height in mm.

What formula is used for C-channel cross-section area?

Area = t × (H + 2F − 2t), where H is the web height, F is the flange width, and t is the wall thickness. This avoids double-counting the flange-web corner material. Weight = Area × Length × Density.

What density is used for wrought iron?

Wrought iron uses 7750 kg/m³. Carbon (mild) steel uses 7850 kg/m³, which is the standard per EN 1993. Cast iron is denser at 7200 kg/m³ due to its graphite microstructure.

How does the UPN standard size selector work?

Selecting a UPN size from the dropdown automatically fills the web height, flange width, and wall thickness fields with the nominal dimensions from the DIN 1026 / EN 10279 table. You can still edit the values if your stock has different tolerances.

Can I calculate for multiple bars at once?

Yes. Enter the quantity in the Quantity field. The result shows the total weight for all bars as well as the per-bar weight for reference.

Why might my result differ from the steel catalogue?

Catalogue weights are theoretical values at nominal dimensions and standard density. Mill tolerances, fillet radii, and slight density differences can cause minor discrepancies — typically within 1–3%.

Iron Channel Weight Calculator

Name: Iron Channel Weight Calculator
Availability: InStock
Author: Nham Vu

Select a standard UPN/U-channel size or enter custom dimensions, specify length and quantity, and get the total iron channel weight in kg and lbs instantly.

Channel Dimensions

Standard UPN Size

Selecting a size auto-fills the fields below.

Web Height (H)

Vertical back wall of the C-section.

Flange Width (F)

Horizontal projecting lip (top and bottom flanges).

Wall Thickness (t)

Uniform thickness of web and both flanges.

Bar Length

Material

Quantity (bars)

Formula Reference

Area = t × (H + 2F − 2t)
Weight = Area × Length × ρ

Where H = web height (m), F = flange width (m), t = wall thickness (m), L = length (m), ρ = density (kg/m³).

C-Section Diagram

Select a UPN size or enter dimensions, then click Calculate.

Iron & Steel Densities

Material	kg/m³	lb/in³
Wrought Iron	7750	0.280
Carbon Steel	7850	0.284
Stainless 304	7930	0.286
Stainless 316	8000	0.289
Cast Iron	7200	0.260
Ductile Iron	7700	0.278

UPN Standard Sizes (EN 10279 / DIN 1026)

Size	H mm	F mm	t mm	kg/m

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