← Back to Bead BoardStainless plate weight calculator
304 and 316 stainless plate at 0.289 lb/in³. About 2% heavier than mild steel and worth about four times as much per pound. A 4×8 sheet of 1/4 inch 304 is 333 lb. Quote it right. Stainless is where shops lose the most money to sloppy weight estimates.
Weights are calculated from published densities and standard section geometry. Real plate and bar stock runs ±2–3% from spec.
Common stainless plate weights (304 / 316)
Formula: length × width × thickness × 0.289. 304 and 316 have identical density and the calculator uses the same number for both. 316 has molybdenum for better corrosion resistance but the chemistry does not change the weight.
Questions welders ask about this one
Is 304 and 316 stainless the same weight?
Yes, within any practical measurement. Both are 0.289 lb/in³ (8.00 g/cm³). 316 has 2% molybdenum added for corrosion resistance but the density shift is small enough that every published datasheet rounds to the same number.
How much does a 4×8 sheet of 1/4 inch 304 stainless weigh?
About 333 pounds. Math: 48 × 96 × 0.25 × 0.289 = 333.1 lb. That is about 2% heavier than the same sheet in mild steel (327 lb) and worth roughly four times as much at the scrap yard.
Why is stainless heavier than mild steel?
Because austenitic stainless steels like 304 and 316 contain nickel (8–10% for 304, 10–14% for 316), which is denser than iron. The 2% weight difference per unit volume adds up on big jobs. A pallet of stainless plate is noticeably heavier than the same pallet of mild steel.
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