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GI Pipe Weight Chart

Find the weight of GI (galvanised iron) pipes in kg per meter and per 6 m length. GI pipes are MS pipes made to IS 1239 and hot-dip galvanised, so they weigh about 2–4% more than black pipe of the same class.

GI Pipe Weight Calculator

All results are in kg.

Material

Outside diameter (OD)

Wall thickness

Length

Quantity (pieces)

Rate per kg (₹, optional)

–Weight of 1 piece

–Total weight

–Weight per meter

–Weight per foot

–Total in tonnes

–Total in pounds

–Paint / galvanizing area

–Estimated cost

GI Pipe Weight Chart (IS 1239, Medium & Heavy)

Nominal bore	OD (mm)	Medium t	Black kg/m	GI approx. kg/m	Heavy t	Black kg/m	GI approx. kg/m
15 NB (½")	21.3	2.6	1.20	1.25	3.2	1.43	1.47
20 NB (¾")	26.9	2.6	1.56	1.62	3.2	1.87	1.93
25 NB (1")	33.7	3.2	2.41	2.48	4.0	2.93	3.00
32 NB (1¼")	42.4	3.2	3.09	3.19	4.0	3.79	3.88
40 NB (1½")	48.3	3.2	3.56	3.67	4.0	4.37	4.48
50 NB (2")	60.3	3.6	5.03	5.18	4.5	6.19	6.33
65 NB (2½")	76.1	3.6	6.44	6.62	4.5	7.95	8.13
80 NB (3")	88.9	4.0	8.37	8.59	4.85	10.05	10.26
100 NB (4")	114.3	4.5	12.18	12.46	5.4	14.50	14.78

Black-pipe weights are calculated for plain ends. "GI approx." adds zinc of about 400 g/m² on the inside and outside surfaces; actual coating weight varies by mill. Screwed-and-socketed pipe is slightly heavier.

GI Pipe Weight by Size

GI Pipe Weight Formula

Black weight (kg/m) = (OD − t) × t × 0.02466

Add the zinc: (π × OD + π × ID) ÷ 1000 × coating (kg/m²). For a 1 inch medium pipe: 2.41 + 0.08 ≈ 2.49 kg/m.

Why Actual Weight Can Differ

Steel is rolled to a size range, not an exact size, so the weight on the weighbridge is rarely exactly the calculated weight.

TMT bars (IS 1786): the mass per meter may vary by about ±7% for bars up to 10 mm, ±5% for 12–16 mm and ±3% for bars above 16 mm.
Plates and sheets (IS 1852 / IS 2062): thickness has a rolling tolerance, so a "10 mm" plate can be slightly thicker or thinner.
Pipes and sections: corner radius, weld seam, zinc coating and end finish (plain or screwed) change the weight a little.

Use the calculated (nominal) weight for estimates and quotations, and the actual weighbridge weight for billing.

Frequently Asked Questions

What is the weight of a 1 inch GI pipe?

A 1 inch (25 NB) medium GI pipe weighs about 2.48 kg per meter, or about 14.9 kg for 6 m.

What is the weight of a 2 inch GI pipe?

A 2 inch (50 NB) medium GI pipe weighs about 5.18 kg per meter.

What is the weight of a ½ inch GI pipe?

A ½ inch (15 NB) medium GI pipe weighs about 1.25 kg per meter.

Is GI pipe heavier than MS pipe?

Slightly. The zinc coating adds roughly 2–4% to the weight of the same size and class.

What is the standard length of a GI pipe?

GI pipes are usually supplied in 6 m lengths (about 20 ft).