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Steel Plate Mass Calculator

Calculate a steel plate's mass from its length, width, and thickness.

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
6.56 ft3.28 ft
Schematic, drawn to the proportions you entered — not to scale on screen.

Plate mass

346.13 lb

High confidence

Running these inputs gives 157 kg as the plate mass. Currently reading for United States under IRC 2024 — pick a different market above and the figures re-cast accordingly.

Estimated cost — your price

This site holds no price list for this material — local prices vary too much to publish honestly. Enter your supplier's price and the result is costed with it.

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

  • Mass = volume × steel density (7850 kg/m³): Length × Width × Thickness × 7850

Your workspace

Most jobs need more than one number. Add the calculators you need next and they open right here, underneath this one — your figures stay on screen and nothing is lost to a page change.

Frequently asked questions

What steel density does this use?
7850 kg/m³, the standard density used for structural steel weight calculations.
Does this account for cut-outs, holes, or bevels in the plate?
No — this calculates the mass of a solid rectangular plate. Subtract the volume of any holes or cut-outs separately if you need a net mass.
Can I use this for other flat steel shapes?
Yes, as long as the shape is a simple rectangle — for irregular shapes, calculate the plan area separately and multiply by thickness and density.