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Engineering Tools
Steel Pipe Weight Calculator (kg/m, kg/foot)
Quickly determine the theoretical weight of MS and seamless steel pipes for your procurement BOQ.
Accurate weight calculation is the starting point of steel pipe procurement. Whether you are estimating freight costs or budgeting a large-scale fabrication project, you need to know exactly how much your required pipes will weigh. Our interactive calculator uses the standard industry formula to instantly convert dimensions into theoretical kilograms per meter and total weight.
Calculate Pipe Weight
Enter pipe dimensions to calculate theoretical steel weight. Results update immediately and are intended for estimating and BOQ work; confirm actual supply mass and tolerances against the applicable standard and MTC.
Calculated result
Theoretical steel weight
Enter the outer diameter and wall thickness to see the result.
How the Formula Works
The theoretical weight of a cylindrical steel pipe is derived from its volume multiplied by the density of carbon steel. The standard accepted density for mild steel (MS) is approximately 7850 kg/m³. The formula subtracts the wall thickness from the outer diameter to find the average diameter, then multiplies by the wall thickness, Pi (π), and density.
Weight (kg/m) = π × (OD - WT) × WT × Density × 0.000001
- OD = Outer Diameter in millimeters (mm)
- WT = Wall Thickness in millimeters (mm)
- Density = 7850 kg/m³ (for standard carbon steel)
Common Sizes — Pre-computed Reference
For quick reference, here are the theoretical weights (in kg/m) for standard IS 1239 ERW pipes across Light (Class A), Medium (Class B), and Heavy (Class C) thicknesses.
| Nominal Bore (NB) | Outer Diameter (mm) | Light (A) kg/m | Medium (B) kg/m | Heavy (C) kg/m |
|---|---|---|---|---|
| 1/2" (15mm) | 21.3 | 0.952 | 1.22 | 1.45 |
| 3/4" (20mm) | 26.9 | 1.41 | 1.58 | 1.90 |
| 1" (25mm) | 33.7 | 2.01 | 2.44 | 2.97 |
| 1.5" (40mm) | 48.3 | 3.25 | 3.61 | 4.43 |
| 2" (50mm) | 60.3 | 4.11 | 5.10 | 6.17 |
| 3" (80mm) | 88.9 | 6.81 | 8.47 | 10.3 |
Standard Sizes — Schedule 40 / 80 Reference
For quick reference, here are the theoretical weights (in kg/m) for standard ASTM A53 Schedule 40 and Schedule 80 pipes. Schedule 40 is the standard wall thickness for general purpose pressure piping, while Schedule 80 is used for higher pressure applications.
| Nominal Bore (NB) | Outer Diameter (mm) | WT (mm) | Schedule | Weight (kg/m) |
|---|---|---|---|---|
| 1/2" (15mm) | 21.3 | 2.77 | 40 | 1.27 |
| 1/2" (15mm) | 21.3 | 3.73 | 80 | 1.62 |
| 1" (25mm) | 33.7 | 3.38 | 40 | 2.53 |
| 1" (25mm) | 33.7 | 4.55 | 80 | 3.27 |
| 2" (50mm) | 60.3 | 3.99 | 40 | 5.54 |
| 2" (50mm) | 60.3 | 5.54 | 80 | 7.48 |
| 3" (80mm) | 88.9 | 4.85 | 40 | 8.62 |
| 3" (80mm) | 88.9 | 7.62 | 80 | 15.25 |
| 4" (100mm) | 114.3 | 6.02 | 40 | 16.08 |
| 4" (100mm) | 114.3 | 8.56 | 80 | 22.32 |
| 6" (150mm) | 168.3 | 7.11 | 40 | 28.26 |
| 6" (150mm) | 168.3 | 10.97 | 80 | 42.56 |
Why Weight Matters When Buying
- Freight Estimation: Transport costs are calculated per Metric Ton (MT). Accurate theoretical weights ensure you book the correct truck capacity.
- Budgeting: Wholesale steel pipes are priced per kilogram. Multiplying the theoretical weight by the per-kg rate gives an accurate cost estimate.
- Structural Load: Engineers need exact pipe weights to calculate the dead load on scaffolding, framing, and foundation supports.
- Tolerance Verification: Comparing theoretical weight to the actual weighbridge slip helps verify that the mill's rolling tolerance is within the acceptable IS/ASTM limits.
Got Your Weight Calculated?
Now multiply it by today's steel rate. Send us your BOQ dimensions and we'll reply with a detailed wholesale quotation.
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