Engineering

Calculate weight

Stainless Steel Weight Calculator

Austenitic stainless (304 and 316) is denser than carbon steel. Using 7.85 g/cm³ understates mass by about 2%, which matters on food-grade tanks, architectural sheet and marine pipe. This page locks the density at 8.00 g/cm³.

Stainless steel · 8 g/cm³

Material

Austenitic 18/8 stainless. Slightly denser than carbon steel.

Shape

length

width

thickness

Result

0.8kg

Weight unit

Volume: 100 cm³
Volume (m³): 0.0001
Density: 8 g/cm³
Density: 8,000 kg/m³

V = L × W × T W = V × ρ

Why a dedicated stainless steel page?

Kitchen equipment, chemical plant, marine fittings, sanitary tube and decorative sheet. 304 and 316 are treated as the same density here; pick the grade for labelling, not for mass.

Formula

Weight (kg) = Volume (m³) × 8000. A 1 m² sheet 3 mm thick weighs 24 kg in stainless versus 23.6 kg in mild steel.

316 plate 5 mm × 1.2 m × 2.4 m (a standard sheet)

Volume = 1.2 × 2.4 × 0.005 = 0.0144 m³. Weight = 0.0144 × 8000 = 115.2 kg.

Alloys on this page

Stainless Steel 304 — 8 g/cm³. Austenitic 18/8 stainless. Slightly denser than carbon steel.
Stainless Steel 316 — 8 g/cm³. Marine-grade 18/10/2 stainless; use 8.00 g/cm³ for estimates.

Duplex stainless is slightly lower (~7.8 g/cm³) and ferritic grades vary. Ferritic 430 is closer to 7.7. Switch to custom density if you are quoting those alloys.

See the full material weight calculator for plastics, titanium, tool steels and custom densities, or jump to Steel, Aluminium, Copper, Brass.

Frequently asked questions

How is metal weight calculated?+

Weight equals volume × density. Volume comes from the shape (for example length × width × thickness for a plate, or πr²L for a round bar). Density is looked up for the selected material, or entered manually for a custom alloy.

What density is used for mild steel?+

Mild steel is calculated at 7.85 g/cm³ (7850 kg/m³), which is the value most fabrication shops and steel stockholders use for estimating plate, bar and section mass.

Can I mix millimetres and inches?+

Yes. Each dimension has its own unit (mm, cm, m, inch, feet). The calculator converts everything internally to a consistent system before applying the density, then reports weight in the unit you choose.

How accurate is the result?+

The geometry is exact for the dimensions you enter. Real parts vary with mill tolerance, coating, chamfers and actual alloy density (stainless 304 vs 316, cast vs wrought aluminium). Treat the figure as a reliable estimate, not a certified weighbridge reading.

Does this include pipe schedules?+

Use the Pipe or Tube shape and enter outside diameter and wall thickness. That covers any schedule once you know OD and WT from a pipe chart.

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