Stainless plate weight calculator
1/4 inch 304 stainless plate weighs 10.40 lb per square foot. A 4×8 sheet of 1/4 is 333 lb. 316 stainless is the same weight. The alloy difference is corrosion resistance, not density. We weigh both at 0.289 lb/in³, about 2% heavier than mild steel and worth roughly four times as much per pound. Stainless is where shops lose the most money to sloppy weight estimates.
Updated September 2026
Quick answer
1/4 inch 304 stainless plate weighs 10.40 lb per square foot. A 4×8 sheet of 1/4 inch is 333 lb. 316 is the same weight. Plug in your size below.
Stainless steel plate weight by thickness
Formula: length × width × thickness × 0.289. ASM data puts 304 at 7.93 g/cm³ (0.2865 lb/in³) and 316 at 7.98, within 1% of each other. The calculator uses 0.289 lb/in³ (8.00 g/cm³) for both, which runs about 1% heavy. The difference is too small to matter for quoting.
Stainless sheet and plate weigh the same per square foot. The only difference is the trade name for the thickness. Material under about 3/16" is usually called sheet and ordered by gauge; 3/16" and up is plate. For thin-gauge sheet, the sheet metal gauge chart converts gauge number to decimal thickness so you can run the same length × width × thickness × 0.289 math.
Odd-shaped part? Work out the volume in cubic inches and multiply by the stainless steel weight per cubic inch (0.289 lb/in³). A cubic foot of it is 499.4 lb. The same chart has every other metal we carry, per cubic inch and per cubic foot.
Questions welders ask about this one
How much does stainless steel plate weigh per square foot?
Depends on thickness. 1/4 inch 304 stainless weighs 10.40 lb per square foot. 1/8 inch is 5.20 lb/sq ft. 3/8 inch is 15.61 lb/sq ft. Formula: thickness (in.) × 144 × 0.289 lb/in³. Works for 316 too, same density for quoting purposes.
Is 304 heavier than 316 stainless?
No. ASM data lists 304 at 7.93 g/cm³ and 316 at 7.98 g/cm³, a 0.6% difference. For any practical quoting math, they weigh the same. The calculator uses 0.289 lb/in³ (8.00 g/cm³) for both, a common rounding that errs about 1% heavy. The real difference is corrosion resistance: 316 has molybdenum for better salt and chemical resistance.
How do I calculate custom stainless plate weight?
Length (in.) × width (in.) × thickness (in.) × 0.289. That gives you pounds. Example: a 36 × 60 × 3/8 inch 304 plate is 36 × 60 × 0.375 × 0.289 = 234 lb. Or use the calculator above. Plug in your dimensions and it does the math.
Weight is only half of material cost. To turn these pounds into a number you can quote, run the weld cost calculator for wire, gas, and labor per inch, or the job pricing calculator to build the whole bid.
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