Stacked round MS steel pipes, related to MS pipe weight chart per IS 1239.
MS Pipe Weight Chart (kg/m): IS 1239 Light, Medium & Heavy
MS (Mild Steel) round pipe is a hollow cylindrical steel section manufactured by ERW or seamless process, classified under IS 1239 Part 1 — one of the most widely used structural and utility pipes across construction, plumbing, industrial, and fabrication applications in India. Pipes are sold by Nominal Bore (NB, an approximate internal diameter) in three weight classes based on wall thickness.
The Three Classes
| Class | Wall Thickness | Typical Use |
|---|---|---|
| Light | 2.0–3.2mm (by size) | Low-pressure water lines, conduit, general light-duty structural use |
| Medium | 2.6–4.0mm (by size) | Water supply, low-pressure gas lines, scaffolding, fencing, general fabrication — most commonly supplied class |
| Heavy | 3.2–4.8mm (by size) | High-pressure pipelines, structural columns, heavy fabrication, fire-fighting lines, industrial piping |
The Formula
Weight (kg/m) = (OD − WT) × WT × 0.0246615, where OD is outer diameter and WT is wall thickness, both in mm.
Worked example: a 50mm NB Medium class pipe (OD 60.3mm, WT 3.6mm) → (60.3 − 3.6) × 3.6 × 0.0246615 = 56.7 × 3.6 × 0.0246615 = 5.03 kg/m.
Total Weight (kg) = Weight per metre × Length (m) × Number of pipes.
To convert kg/m to kg/foot, multiply by 0.3048 — e.g. 5.03 kg/m × 0.3048 = 1.53 kg/foot.
Ordering & Bundle Reference
Standard MS pipes per IS 1239 are supplied in 6-metre lengths. Bundle sizes vary by diameter — smaller bore pipes typically come in bundles of 18 to 32 pieces. To calculate total bundle weight: kg/m × 6 metres × number of pipes in the bundle. Always confirm exact bundle quantity with the supplier before finalising an order.
Values from published charts are indicative — actual weights may vary slightly by manufacturer. Verify with the Mill Test Certificate for critical applications.
Frequently Asked Questions
What is the formula for MS pipe weight per metre?
Weight (kg/m) = (OD − WT) × WT × 0.0246615, where OD and WT (wall thickness) are in mm.
What's the difference between Light, Medium, and Heavy class MS pipe?
They differ in wall thickness at the same nominal bore — Light suits low-pressure/light-duty use, Medium is the most commonly supplied general-purpose class, and Heavy suits high-pressure and structural applications.
How do I convert MS pipe weight from kg/m to kg/foot?
Multiply the kg/m value by 0.3048.
What is the standard length of MS pipe supplied in India?
6 metres per IS 1239, typically supplied in size-dependent bundle quantities.
How is round MS pipe different from MS square pipe?
Round MS pipe follows IS 1239 with Light/Medium/Heavy classes; MS square (hollow) pipe follows IS 4923 — different standards, different weight formulas, and different typical applications.
Share nominal bore, class, and quantity — Vishwageeta Ispat will confirm kg/m and a mill-linked quote.
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