MS Pipe Weight Calculator — Formula, Chart & All Sizes
By Special Correspondent · SteelMath
MS (Mild Steel) pipe weight is one of the most frequently calculated values in the steel industry. Whether you’re placing a purchase order, checking a delivery, or estimating project materials, you need this number daily. Here’s the formula, a complete reference chart, and access to our free calculator.
The Formula
MS Pipe Weight per metre (kg/m) = (OD − Wall Thickness) × Wall Thickness × 0.02466
Where OD is the outer diameter in millimetres and Wall Thickness is also in millimetres. The constant 0.02466 derives from π × steel density (7,850) ÷ 1,000,000.
For those who prefer the alternative form: Weight (kg/m) = (OD² − ID²) × 0.00617, where ID is the inner diameter.
Common MS Pipe Weights — Quick Reference
Here are the weights for the most commonly traded MS pipes in India, following IS 1239 (ERW) and IS 3589 (SAW) standards:
15mm NB (½ inch), OD 21.3mm, thickness 2.6mm: weight 1.21 kg/m.
20mm NB (¾ inch), OD 26.9mm, thickness 2.6mm: weight 1.56 kg/m.
25mm NB (1 inch), OD 33.7mm, thickness 3.2mm: weight 2.41 kg/m.
32mm NB (1¼ inch), OD 42.4mm, thickness 3.2mm: weight 3.10 kg/m.
40mm NB (1½ inch), OD 48.3mm, thickness 3.2mm: weight 3.56 kg/m.
50mm NB (2 inch), OD 60.3mm, thickness 3.6mm: weight 5.03 kg/m.
65mm NB (2½ inch), OD 76.1mm, thickness 3.6mm: weight 6.42 kg/m.
80mm NB (3 inch), OD 88.9mm, thickness 4.0mm: weight 8.38 kg/m.
100mm NB (4 inch), OD 114.3mm, thickness 4.5mm: weight 12.18 kg/m.
150mm NB (6 inch), OD 168.3mm, thickness 5.0mm: weight 20.11 kg/m.
200mm NB (8 inch), OD 219.1mm, thickness 6.3mm: weight 33.05 kg/m.
These are medium (Class B) weights per IS standards. Light (Class A) pipes have thinner walls and weigh less. Heavy (Class C) pipes have thicker walls and weigh more.
Practical Tips
When ordering pipes, always specify whether you need light, medium, or heavy class — the weight difference can be 15–25%. A “2-inch pipe” without class specification is ambiguous and can lead to disputes.
For seamless pipes (IS 2062), weights may differ slightly from ERW pipes of the same dimensions due to manufacturing tolerances. Always confirm the pipe standard and wall thickness with your supplier.
Standard pipe lengths in India are 6 metres. When calculating total weight for a PO, multiply weight per metre by 6 to get per-piece weight, then by the number of pieces.
Use SteelMath’s Steel Weight Calculator for instant pipe weight calculations. Select “Pipe” from the section types, enter OD and wall thickness, and get your answer with one tap. No formula memorisation required.