| NB (mm) | Inch | OD (mm) | WT (mm) | kg/m | kg/6m |
|---|---|---|---|---|---|
| 15 | ½" | 21.3 | 2.6 | 1.21 | 7.26 |
| 20 | ¾" | 26.9 | 2.6 | 1.56 | 9.36 |
| 25 | 1" | 33.7 | 3.2 | 2.41 | 14.46 |
| 32 | 1¼" | 42.4 | 3.2 | 3.10 | 18.60 |
| 40 | 1½" | 48.3 | 3.2 | 3.56 | 21.36 |
| 50 | 2" | 60.3 | 3.6 | 5.03 | 30.18 |
| 65 | 2½" | 76.1 | 3.6 | 6.42 | 38.52 |
| 80 | 3" | 88.9 | 4 | 8.38 | 50.28 |
| 100 | 4" | 114.3 | 4.5 | 12.18 | 73.08 |
| 125 | 5" | 139.7 | 5 | 16.62 | 99.72 |
| 150 | 6" | 168.3 | 5 | 20.11 | 120.66 |
| 200 | 8" | 219.1 | 6.3 | 33.05 | 198.30 |
The weight of a mild steel pipe is determined by its cross-sectional area multiplied by the length and density of steel:
Where OD = Outer Diameter in mm, WT = Wall Thickness in mm. The constant 0.02466 = π × 7850 / 1,000,000.
Given: OD = 60.3mm, WT = 3.6mm
Step 1: (60.3 − 3.6) = 56.7
Step 2: 56.7 × 3.6 × 0.02466 = 5.03 kg/m
GI pipes weigh approximately 3-5% more than MS pipes due to the zinc coating. Multiply MS weight by 1.04 for GI pipe weight.
MS pipe weight per metre = (OD − WT) × WT × 0.02466, where OD is outer diameter in mm and WT is wall thickness in mm. Example: 2" NB pipe (OD 60.3mm, WT 3.6mm) weighs (60.3 − 3.6) × 3.6 × 0.02466 = 5.03 kg/m.
NB (Nominal Bore) is the approximate internal diameter used for classification, while OD (Outer Diameter) is the actual external measurement. A 50mm NB pipe has an actual OD of 60.3mm.
IS 1239 classifies steel pipes into Light (A), Medium (B) and Heavy (C) based on wall thickness. Medium class is most common. This calculator uses Medium class values by default.
A 1 inch (25mm NB) MS pipe in Medium class weighs 2.41 kg per metre with OD 33.7mm and WT 3.2mm. A 6m length weighs 14.46 kg.
Standard length is 6 metres as per IS 1239. GI pipes are also 6m. Custom cut lengths may be available for large orders.