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Steel I-Beam Weight-per-Length Calculator

Calculate a steel I-beam's weight per unit length from its web and flange dimensions.

Computed in your browser — nothing you enter is uploaded. Figures are presented for United States against IRC 2024, and every formula is cited under regulatory standards below.

Last verified 2026-08-26 · v1.0.0

Market
Imperial · sales tax

Weight per meter

45.59 kg/m

Check your inputs

Simplified rectangular approximation omitting web-flange fillet area — for exact values, use the published AISC (or equivalent) shapes table for your specific designation.

Cross-sectional area
5808 mm²

Running these inputs gives 45.6 kg/m as the weight per meter. Expect some drift against the real job; the calculation is solid but conditions on site are not. Currently reading for United States under IRC 2024 — pick a different market above and the figures re-cast accordingly.

Add the equipment this sizes

This result is a specification — 45.593 kg/m — not a quantity. Put the thing it sizes into your project: how many, what you call it, and your supplier’s price.

Preliminary estimate, not certified engineering. This tool produces an indicative quantity calculation for planning purposes only — it is not a certified structural analysis, a guaranteed material takeoff, or a substitute for building department approval. Always verify measurements on-site and have a licensed contractor or structural engineer review any load-bearing, code-sensitive, or safety-critical work before purchasing materials or starting construction. Spotted an arithmetic or standards error? Report it to contact@craftquantities.com with your inputs — confirmed fixes become pinned regression tests.

[Schema Verified] Computed in alignment with American Concrete Institute (ACI 318-19) formulas and International Residential Code (IRC 2024) spatial boundaries.

Regulatory standards & verification citations

  • Weight per unit length = cross-sectional area × steel density (7850 kg/m³); simplified I-shape area = 2×(flange width × flange thickness) + (depth − 2×flange thickness) × web thickness, omitting fillet area (a slight underestimate vs. published AISC tables)

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Frequently asked questions

Why does this weight differ slightly from a published AISC shapes table?
This calculator approximates the I-shape as three rectangles (two flanges plus a web) and omits the small fillet area where the web meets the flanges, so it will run slightly under the exact tabulated weight for a given designation.
What steel density does this use?
7850 kg/m³, the standard density used for structural steel weight calculations.
Can I use this for a built-up or welded plate girder?
Yes — the same rectangular-approximation formula applies to any doubly-symmetric I-shape built from a web plate and two flange plates, whether hot-rolled or welded, as long as you enter the actual depth, flange, and web dimensions.