By Zencalcy Editorial TeamLast reviewed About us
Steel plate weighs 40.8 lb per square foot per inch of thickness — a figure worth memorising. This calculator turns that into sheet weights for any size, adds the cost at your price per pound, and shows the metric equivalent for drawings that mix units.
Steel plate weight per square foot and per sheet.
Weight (lb) = area (ft²) × thickness (in) × 40.8
40.8 lb/ft² per inch comes from 7,850 kg/m³ steel. Stainless steel is about 2% heavier and aluminium about 66% lighter. The number is theoretical; mill tolerance and surface condition shift the actual scale weight slightly.
| Symbol | Meaning |
|---|---|
| A | Plate area in square feet. |
| t | Thickness in inches. |
| W | Weight in pounds. |
8 sq ft × 1 inch × 40.8 = 326 lb, or about 148 kg.
Continue with the Gravel Calculator, Sand Calculator, Rock Calculator, or the River Rock Calculator — or browse more materials & quantities and all construction calculators.
32 sq ft × 0.25 × 40.8 = 326 lb (148 kg).
Results use standard construction estimating arithmetic: volumes from measured area and depth, unit weights from published material densities, and code-referenced spans or clearances where the page names a code. Quantities are rounded up to whole saleable units and include the stated waste allowance. These tools are planning aids, not structural design, and do not replace a licensed engineer, a local code check, or a contractor's site measurement.
Reference material used to build and check this calculator:
Last reviewed: September 2026. See how we build and check every tool on the about page.
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Content updated: September 2026