SS Pipe Weight Chart for Railing: kg per Metre and per Foot

Stainless steel railing is bought and sold by weight. The fabricator buys tube by the kilogram, so the weight of every pipe in a railing is the biggest single input to its price per running foot, and the quickest way to compare two quotations is to compare the kilograms of steel in them. This chart gives the weight of the common railing tube sizes in kg per metre and kg per foot, the formula behind it so you can work out any size, and a worked example for a typical balcony railing. For which size goes where, see the SS railing pipe size and thickness guide.

The formula

A tube is a ring of metal, so its weight per metre is the area of that ring multiplied by the density of the steel. For a round tube this simplifies to:

Weight (kg/m) = (OD − t) × t × 0.02491 for SS 304 and SS 316, where OD is the outside diameter in mm and t is the wall thickness in mm.

The constant 0.02491 is π × density ÷ 1,000 with stainless steel taken at 7.93 g/cm³. Mild steel is slightly lighter at 7.85 g/cm³, so for MS tube the constant is 0.02466, about 1% less. Aluminium is roughly a third of the weight, which is one reason an aluminium railing prices differently.

For a square tube the ring is a square annulus. Its area is side² − (side − 2t)², which works out to 4 × t × (side − t), so:

Weight (kg/m) = 4 × (side − t) × t × 0.00793 for stainless square tube, with side and t in mm.

To convert to kg per foot, multiply by 0.3048. To get the weight of a length, multiply by the length in metres.

Round SS pipe weight chart

Outside diameters are the inch sizes the Indian trade stocks, in the walls that are actually used for railing. All figures are for SS 304; SS 316 is within 1% of the same.

First figure kg per metre, second kg per foot. Calculated at 7.93 g/cm³; mill tolerance on wall thickness means a delivered length can vary by a few percent either way.

Square SS pipe weight chart

A square tube weighs noticeably more than a round tube of the same nominal size because it has more metal in the corners: a 50 mm square in 1.5 mm wall is 2.31 kg/m against 1.84 kg/m for a 50.8 mm round. That is part of why a square-section railing quotes higher for the same look of size. The handrail profiles we make, round, square, oval and rectangular, are compared in the SS handrail profiles guide.

Worked example: a 10 ft balcony railing

Take a plain pipe railing on a 10 ft (3.05 m) balcony, 1 m high, built the way most Indian fabricators build it:

• Top rail: 50.8 mm × 1.5 mm, 3.05 m long → 1.84 × 3.05 = 5.6 kg
• Posts: 38.1 mm × 1.5 mm, four posts at roughly 1.2 m centres, 1.0 m each → 1.37 × 4.0 = 5.5 kg
• Balusters: 12.7 mm × 1.2 mm, 24 pieces at 0.9 m → 0.34 kg/m × 21.6 m = 7.4 kg

That is about 18.5 kg of stainless steel, or roughly 1.85 kg per running foot, before base plates, caps and welding consumables. Switch the top rail to 2.0 mm wall and the posts to 50.8 mm and the same railing is closer to 24 kg. Swap the balusters for a glass panel and the steel drops to about 11 kg but the glass, at around 30 kg per square metre for 12 mm, comes in instead; the toughened glass weight chart has those figures.

Why weight sets the price

Stainless tube is sold by the kilogram, and the fabricator's price per running foot is built from three things: the kilograms of tube, the fabrication and polishing labour, and the fittings. The first of those is the one you can check. If one quotation is a third cheaper than another for what looks like the same railing, the usual reason is thinner wall, a smaller top rail, or fewer posts, and the chart above lets you put a number on it. It is also why a quotation should name the pipe size and wall thickness for each member, as set out in what a railing quotation should include.

Two more things to know. The weight difference between SS 304 and SS 316 is negligible; the price difference is in the alloy, not the kilograms. And the gap between a stainless and a mild steel railing is not mostly weight either, since MS tube is only 1% lighter; it is the price per kilogram of the metal, which is why the ranges in the SS railing price per running foot guide and the MS railing price guide sit so far apart.

Using the chart when you order

1. List every member of the railing with its OD, wall and total length.
2. Multiply each length by the kg/m figure from the chart and add them up.
3. Add 5 to 8% for cutting waste and offcuts on a fabricated job.
4. Multiply by the day's SS price per kg for a material cost, then compare with the quotation.

Glass railing systems shift the weight from pipe to glass and hardware. For those, the kilograms that matter are the glass panels and the aluminium or stainless profiles, and the railing systems comparison describes what each system carries.