Stainless square tube weight calculator
Stainless square tube shows up on railings, food-grade frames, and architectural work. It runs four-plus times the price of mild steel per pound, so a sloppy weight estimate comes straight out of your pocket. We weigh 304 at 0.289 lb/in³. A 2×2×1/8 tube is 3.11 lb/ft. A 2×2×1/4 is 5.51 lb/ft. 316 is the same weight. Enter your size below.
Updated September 2026
Quick answer
Calculate 304 and 316 stainless square tube weight by outside dimension and wall thickness.
Common 304 stainless square tube weights
These use nominal wall and the same rounded-corner model as the calculator: outside corner radius twice the wall, inside radius one wall, the way AISC figures welded structural tube. Stainless mechanical tube is sometimes rolled with tighter corners, which makes it a percent or two heavier than this. 304 and 316 are within 1% of each other, so the calculator uses the same number for both.
Questions welders ask about this one
How much does 2×2×1/4 stainless square tube weigh?
About 5.51 lb per foot in 304, with the corners rounded the A500 way. 316 is the same. That is about 3 times the weight of the same tube in aluminum, and it costs a lot more per pound, so guess high on a cut list and you have eaten the job.
Does 304 and 316 stainless tube weigh the same?
For quoting, yes. Datasheets put 304 at 7.93 g/cm³ (0.2865 lb/in³) and 316 at 7.98, about 0.6% apart. The calculator uses 0.289 lb/in³ (8.00 g/cm³) for both, which runs about 1% heavy. The real difference is corrosion resistance: 316 adds molybdenum for salt and chemical environments.
How do I calculate custom stainless square tube weight?
Cross-section = 2 × wall × (2 × outside − 2 × wall), less the rounded corners: (4 − π) × (Ro² − Ri²), with Ro = 2 × wall and Ri = wall. Multiply by length and 0.289 lb/in³. Example: 1.5 × 1.5 × 1/8 over 6 ft comes to 13.5 lb. Or use the calculator above.
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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