Pipe and round HSS sizes and weights

Standard, extra-strong and double-extra-strong steel pipe from 1/2 to 26 in, and 189 sizes of round HSS, with weight in pounds per foot and kilograms per metre, outside diameter and wall. Type a size into the box to jump to it.

• 2 in schedule 40 (Pipe 2 STD) — 3.66 lb/ft, 5.45 kg/m
• 3 in schedule 40 (Pipe 3 STD) — 7.58 lb/ft, 11.3 kg/m
• 4 in schedule 40 (Pipe 4 STD) — 10.8 lb/ft, 16.1 kg/m
• 6 in schedule 40 (Pipe 6 STD) — 19 lb/ft, 28.3 kg/m
• 2 in schedule 80 (Pipe 2 XS) — 5.03 lb/ft, 7.49 kg/m
• 4 in schedule 80 (Pipe 4 XS) — 15 lb/ft, 22.3 kg/m

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Pipe sizes: nominal size, schedule and wall class

A pipe is named by its nominal size and its wall. The nominal size fixes the outside diameter — 2.375 in for 2 in pipe, 4.5 in for 4 in — and the wall class sets the thickness and with it the bore and the weight. The table uses the three classes of the AISC list:

• STD, standard weight — the same wall as schedule 40 up to 10 in.
• XS, extra strong — the same wall as schedule 80 up to 8 in.
• XXS, double extra strong — the heaviest wall class; it has no schedule number of its own.

Above those sizes the schedule numbers and the wall classes part company: a 12 in STD pipe has a 0.375 in wall, thinner than 12 in schedule 40. If a drawing says “schedule 40” for 12 in or larger, do not read the weight from the STD row.

Round HSS

Round HSS is named by what it measures: HSS4.000×0.250 is 4.000 in outside diameter with a 0.250 in nominal wall. As with square and rectangular HSS to ASTM A500, the wall may come in up to ten per cent under nominal, and design uses 0.93 of it; the weights in the chart are nominal.

Cutting and welding pipe

The weight tells you what a length will take to lift and handle; the outside diameter and wall decide the joint prep and the filler. For a branch connection, the saddle on the end of the branch and the hole in the run pipe can be printed at full size with the pipe notching template — enter the outside diameters from this table, not the nominal sizes. The positions on a fixed pipe and how the technique changes as you work around it are in pipe welding positions.

Square and rectangular sections are in the HSS weight chart; any metric tube size can be worked out with the tube and hollow section weight calculator.

Author: Dmitry Frolov, welder and metal fabricator Updated: 13 October 2026