Which sizes can you supply?

Round pipe from 21.3 mm to 168.3 mm outside diameter, and square or rectangular hollow sections from 20 x 20 mm to 150 x 150 mm, in the wall thicknesses listed on the page.

Which sizes can you supply?

Round pipe from 21.3 mm to 168.3 mm outside diameter, and square or rectangular hollow sections from 20 x 20 mm to 150 x 150 mm, in the wall thicknesses listed on this page. Other sizes, lengths and cut-to-length orders are produced to order.

Steel Pipe & Tube Weight Calculator

Q: Why is the calculated weight different from the weight on my invoice?

This calculator returns theoretical weight. Real pipe is rolled to a wall-thickness tolerance, so the weight shown on the mill test certificate and packing list is the weight you are invoiced for. For most consignments the two agree within a few per cent.

Q: Can I use this calculator for stainless steel or galvanised pipe?

Use it for carbon steel. Stainless steel is denser, about 7.93 to 8.00 g/cm3 depending on grade, so stainless pipe weighs roughly one to two per cent more than the figure shown.

Q: Do you supply cut-to-length material, and what is your minimum order?

Yes. Standard delivery lengths are 6 m and 12 m and we cut to your cutting list on request. Trial orders start from one tonne for stock sizes, and mixed loads combining several sizes are welcome.

Enter the outside diameter (or side length) and the wall thickness, and this calculator returns the
theoretical weight per metre, per length and for your full order quantity.
It covers round pipe and square / rectangular hollow sections — the two families our mill
supplies most often. All figures use the standard steel density of 7.85 g/cm³.

Outside diameter (mm)

Side A / width (mm)

Side B / height (mm)

Wall thickness (mm)

Length per piece (m)

Quantity (pieces)

5.03
kg / m

Per piece30.2 kg

Total order3.02 t

Formula used(OD − t) × t × 0.02466

Common round pipe sizes

Theoretical weight per metre, calculated with the formula shown at the bottom of this page.

Outside diameter (mm)	Wall thickness (mm)	Inside diameter (mm)	Weight (kg/m)	Weight, 6 m length (kg)
21.3	2.8	15.7	1.28	7.66
26.9	2.8	21.3	1.66	9.97
33.7	3.2	27.3	2.41	14.45
42.4	3.2	36.0	3.09	18.54
48.3	3.2	41.9	3.56	21.38
60.3	3.6	53.1	5.03	30.18
76.1	3.6	68.9	6.44	38.64
88.9	4.0	80.9	8.37	50.24
114.3	4.0	106.3	10.88	65.30
139.7	4.0	131.7	13.39	80.35
168.3	5.0	158.3	20.13	120.80

Common square & rectangular tube sizes

Sizes are given as side A × side B × wall thickness, in millimetres.

Size (mm)	Section type	Weight (kg/m)	Weight, 6 m length (kg)
20 × 20 × 1.2	Square	0.72	4.31
25 × 25 × 1.5	Square	1.12	6.74
30 × 30 × 1.5	Square	1.36	8.15
40 × 40 × 2.0	Square	2.41	14.48
50 × 50 × 2.0	Square	3.04	18.26
60 × 60 × 2.5	Square	4.56	27.37
80 × 80 × 3.0	Square	7.32	43.94
100 × 100 × 3.0	Square	9.20	55.19
120 × 120 × 4.0	Square	14.68	88.09
150 × 150 × 4.0	Square	18.45	110.70
40 × 20 × 1.5	Rectangular	1.36	8.14
50 × 25 × 2.0	Rectangular	2.26	13.54
60 × 40 × 2.0	Rectangular	3.04	18.26
80 × 40 × 3.0	Rectangular	5.43	32.60
100 × 50 × 3.0	Rectangular	6.85	41.12
120 × 60 × 3.0	Rectangular	8.26	49.53
150 × 100 × 4.0	Rectangular	15.31	91.85

How the calculation works

Steel pipe weight is worked out from the cross-sectional area of the wall multiplied by the density of steel.
For a round pipe the wall area is the difference between the outside circle and the inside circle; for a
hollow section it is the perimeter of the mid-line multiplied by the wall thickness.

Round pipe
W = (OD − t) × t × 0.02466
OD = outside diameter, t = wall thickness, result in kg/m

Square & rectangular tube
W = ((A + B) × 2 ÷ 3.14 − t) × t × 0.02466
A, B = outside sides, t = wall thickness, result in kg/m

The constant 0.02466 comes from the density of carbon steel (7.85 g/cm³) divided by 1,000
(π × 7.85 ÷ 1,000). Values are theoretical weights: the actual weight of a consignment
depends on mill tolerances, so use these figures for estimating freight and planning only, and take the
weight stated on the mill test certificate as final. Thickness is always the nominal wall thickness.

Frequently asked questions

Why is the calculated weight different from the weight on my invoice?

Because this is a theoretical figure. Real pipe is rolled to a tolerance — the wall may be slightly
thicker or thinner than nominal — so the weight on the mill test certificate and on the packing list
is the weight you are invoiced for. For most consignments the two agree within a few per cent, which is
close enough for estimating container loading and freight.

Can I use this calculator for stainless steel or galvanised pipe?

Use it for carbon steel. Stainless steel is denser (about 7.93–8.00 g/cm³ depending on grade), so
stainless pipe weighs roughly 1–2 per cent more than the figure shown. Hot-dip galvanising adds a zinc
layer that is normally ignored in trade calculations; if you need the coated weight, tell us the zinc
coating weight and we will work it out for you.

Which sizes can you actually supply?

Round pipe from 21.3 mm to 168.3 mm outside diameter, and square or rectangular hollow
sections from 20 × 20 mm to 150 × 150 mm, in the wall thicknesses shown above. Other sizes,
lengths and cut-to-length orders are produced to order — send us the specification and we will confirm
availability and lead time.

Do you supply cut-to-length, and what is your minimum order?

Yes. Standard delivery lengths are 6 m and 12 m, and we cut to your drawing or cutting list on
request. Trial orders start from one tonne for stock sizes; mixed loads combining several sizes are
welcome.

Need a price for a specific size?

Send us the size, grade, quantity and destination port — we reply with price and delivery terms
within 24 hours.

Request a quote