MS Pipe Weight Calculator

Engineering Guide to Mild Steel Pipe Weight

Mild steel (MS) circular pipes and tubes are essential in industrial fabrication, scaffolding, structural trusses, fire protection piping, and plumbing conduits. Estimating pipe weight is essential for freight logistics, structural dead-load engineering, and purchasing by metric ton.

Derivation of the Mathematical Multiplier

The volume of steel in a one-meter length ($1,000\text{ mm}$) of round pipe is:

$$\text{Volume} = \text{Cross-Sectional Area} \times 1,000\text{ mm}$$

$$\text{Area} = \frac{\pi}{4} \left(\text{OD}^2 - \text{ID}^2\right) = \pi \times (\text{OD} - \text{WT}) \times \text{WT}$$

Taking standard structural carbon steel density of $7,850\text{ kg/m}^3$ ($7.85 \times 10^{-6}\text{ kg/mm}^3$):

$$\text{Weight (kg/m)} = \pi \times (\text{OD} - \text{WT}) \times \text{WT} \times 1,000 \times 0.00000785$$ $$\pi \times 0.00785 = \mathbf{0.0246615}$$

Thus, the industry-standard shortcut formula: $$\mathbf{\text{Weight (kg/m)} = (\text{OD} - \text{WT}) \times \text{WT} \times 0.02466}$$

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Common Standard Pipe Sizes Reference (IS 1239 / ASTM A53)

Nominal Bore (NB / Inch)	Outer Diameter (OD mm)	Light Class (kg/m)	Medium Class (kg/m)	Heavy Class (kg/m)
1/2” (15 mm)	21.3 mm	0.95 kg/m (2.0 mm WT)	1.22 kg/m (2.6 mm WT)	1.45 kg/m (3.2 mm WT)
3/4” (20 mm)	26.9 mm	1.41 kg/m (2.3 mm WT)	1.58 kg/m (2.6 mm WT)	1.90 kg/m (3.2 mm WT)
1” (25 mm)	33.7 mm	2.01 kg/m (2.6 mm WT)	2.44 kg/m (3.2 mm WT)	2.97 kg/m (4.0 mm WT)
1-1/2” (40 mm)	48.3 mm	3.25 kg/m (2.9 mm WT)	3.61 kg/m (3.2 mm WT)	4.43 kg/m (4.0 mm WT)
2” (50 mm)	60.3 mm	4.11 kg/m (2.9 mm WT)	5.10 kg/m (3.6 mm WT)	6.17 kg/m (4.5 mm WT)
3” (80 mm)	88.9 mm	6.81 kg/m (3.2 mm WT)	8.47 kg/m (4.0 mm WT)	10.10 kg/m (4.8 mm WT)