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Pipe Weight Formula โ€” Complete Guide

Industry-standard formulas for calculating the weight of round, square, and rectangular pipes. Includes step-by-step examples, variable explanations, and unit conversions.

โญ• Round Pipe Formula โฌœ Square Pipe Formula โ–ฌ Rectangular Pipe Formula ๐Ÿ”„ Unit Conversions ๐Ÿ“‹ Variable Reference โ“ FAQs
โญ• Formula 01

Round Pipe Weight Formula

Used for MS pipe, GI pipe, steel pipe, and any hollow circular section.

Primary Formula โ€” Round / Circular Pipe
Weight (kg/m) = (OD โ€“ t) ร— t ร— 0.02466
Where: OD = Outer Diameter (mm) ยท t = Wall Thickness (mm) ยท 0.02466 = ฯ€ ร— ฯ_steel / 1000
Alternative Full Form
Weight (kg/m) = ฯ€ ร— (OD โ€“ t) ร— t ร— 7850 / 1,000,000
ฯ_steel = 7850 kg/mยณ (mild steel standard density)

Variable Reference

ODOuter Diameter of pipein millimeters (mm)
tWall Thickness of pipein millimeters (mm)
0.02466ฯ€ ร— 7850 / 1,000,000Density constant for steel (kg/m per mmยฒ)
kg/mKilograms per meterOutput unit (weight per unit length)

Step-by-Step Calculation

1

Measure Outer Diameter (OD)

Get the outer diameter of the pipe in mm. For a 2-inch pipe (nominal bore), the actual OD is typically 60.3mm as per IS:1239.

2

Measure Wall Thickness (t)

Get the pipe wall thickness in mm. This is specified in pipe standards (e.g., IS:1239 Medium class = 3.2mm for 2-inch pipe).

3

Apply the Formula

Calculate: Weight (kg/m) = (OD โ€“ t) ร— t ร— 0.02466

4

Multiply by Length

To get total weight: Total Weight (kg) = Weight (kg/m) ร— Length (m)

5

Multiply by Quantity

For multiple pipes: Total Weight = Weight per pipe ร— Quantity (nos)

๐Ÿ“ Worked Example โ€” 2-inch MS Pipe (60.3mm OD ร— 3.2mm thick, 6m length, 10 nos)

Step 1: OD = 60.3 mm, t = 3.2 mm
Step 2: Weight/m = (60.3 โ€“ 3.2) ร— 3.2 ร— 0.02466
Step 3: = 57.1 ร— 3.2 ร— 0.02466 = 4.505 kg/m
Step 4: Weight per 6m pipe = 4.505 ร— 6 = 27.03 kg
Step 5: Total for 10 pipes = 27.03 ร— 10 = 270.3 kg
Total Weight = 270.3 kg
โฌœ Formula 02

Square Pipe Weight Formula

Used for SHS (Square Hollow Section) pipes โ€” MS, GI, steel square tubes.

Primary Formula โ€” Square Hollow Section (SHS)
Weight (kg/m) = (4 ร— W โ€“ 4 ร— t) ร— t ร— 0.00785
Simplified: Weight = 4 ร— (W โ€“ t) ร— t ร— 0.00785
W = Width/Side (mm) ยท t = Wall Thickness (mm) ยท 0.00785 = ฯ_steel / 1,000,000
Derivation from First Principles
Perimeter_wall = 4 ร— (W โ€“ t) [inner perimeter approximation] Cross-sectional area = Perimeter_wall ร— t Weight (kg/m) = Area ร— ฯ_steel / 1,000,000

Variable Reference

WWidth (same as Height for square)in millimeters (mm)
tWall Thicknessin millimeters (mm)
0.00785Steel density constant (7850 / 1,000,000)kg/mmยณ equivalent

๐Ÿ“ Worked Example โ€” 75ร—75ร—4mm Square MS Pipe, 12m length, 5 nos

Step 1: W = 75 mm, t = 4 mm
Step 2: Weight/m = (4 ร— 75 โ€“ 4 ร— 4) ร— 4 ร— 0.00785
Step 3: = (300 โ€“ 16) ร— 4 ร— 0.00785 = 284 ร— 4 ร— 0.00785 = 8.92 kg/m
Step 4: Weight per 12m = 8.92 ร— 12 = 107.04 kg
Step 5: Total for 5 pipes = 107.04 ร— 5 = 535.2 kg
Total Weight = 535.2 kg
โ–ฌ Formula 03

Rectangular Pipe Weight Formula

Used for RHS (Rectangular Hollow Section) โ€” all rectangular steel tubes.

Primary Formula โ€” Rectangular Hollow Section (RHS)
Weight (kg/m) = (2(W + H) โ€“ 4t) ร— t ร— 0.00785
W = Width (mm) ยท H = Height (mm) ยท t = Wall Thickness (mm)
Note: When W = H, this simplifies to the Square Pipe formula.

Variable Reference

WWidth of rectangular sectionin millimeters (mm)
HHeight of rectangular sectionin millimeters (mm)
tWall Thickness (uniform all sides)in millimeters (mm)
2(W+H)Full perimeter of outer rectanglein millimeters (mm)
4tCorner correction factoraccounting for corner overlaps

๐Ÿ“ Worked Example โ€” 150ร—100ร—5mm RHS, 6m, 20 nos

Step 1: W = 150mm, H = 100mm, t = 5mm
Step 2: 2(W+H) = 2 ร— (150+100) = 2 ร— 250 = 500mm
Step 3: Weight/m = (500 โ€“ 4ร—5) ร— 5 ร— 0.00785 = 480 ร— 5 ร— 0.00785 = 18.84 kg/m
Step 4: Per pipe (6m) = 18.84 ร— 6 = 113.04 kg
Step 5: Total (20 nos) = 113.04 ร— 20 = 2260.8 kg
Total Weight = 2260.8 kg โ‰ˆ 2.26 MT
๐Ÿ”„ Unit Conversion

Metric โ†” Imperial Conversions

For engineers working between India (metric) and USA (imperial) unit systems.

1 inch
โ†“
= 25.4 mm
1 foot
โ†“
= 0.3048 m = 304.8 mm
1 kg/m
โ†“
= 0.6720 lbs/ft
1 lbs/ft
โ†“
= 1.4882 kg/m
1 kg
โ†“
= 2.20462 lbs
1 MT (tonne)
โ†“
= 1000 kg = 2204.62 lbs
Converting kg/m to lbs/ft
Weight (lbs/ft) = Weight (kg/m) ร— 0.6720 Weight (kg/m) = Weight (lbs/ft) ร— 1.4882
๐Ÿ“‹ Material Reference

Steel Density & Material Constants

MaterialDensity (kg/mยณ)Density (g/cmยณ)Formula ConstantNotes
Mild Steel (MS)78507.850.02466 (round) / 0.00785 (SHS/RHS)IS standard
Galvanized Iron (GI)78007.80โ‰ˆ 0.02450 (round)Zinc coating included
Stainless Steel 30479307.930.02492 (round)For SS pipes
Stainless Steel 31679807.980.02508 (round)Marine grade
Aluminium27102.710.00851 (round)Lightweight structural

Pipe Weight Formula โ€” FAQs

Where does the constant 0.02466 come from?โ–ผ
The constant 0.02466 = ฯ€ ร— ฯ_steel / 1,000,000 = 3.14159 ร— 7850 / 1,000,000 = 0.024674. Rounded to 0.02466 for practical use. It converts the cross-sectional area of the pipe wall (in mmยฒ) to weight per meter (in kg).
Why is the formula (OD โ€“ t) ร— t instead of (ODยฒ โ€“ IDยฒ)?โ–ผ
Both are equivalent. The full formula uses ODยฒ โ€“ IDยฒ = (OD โ€“ ID)(OD + ID). Since ID = OD โ€“ 2t, we get: ODยฒ โ€“ (ODโ€“2t)ยฒ = 4t(ODโ€“t). The simplified formula (ODโ€“t) ร— t is derived from this, incorporating the factor 4 into the constant. Result is identical.
Can I use the same formula for GI pipe?โ–ผ
Yes. GI pipe uses the same formula as MS pipe. The zinc coating adds approximately 2โ€“3% to the actual weight, but for most engineering estimates, the MS formula gives acceptably accurate results for GI pipes.
How do I convert the result from kg/m to kg/foot?โ–ผ
Multiply kg/m by 0.3048. For example, if a pipe weighs 4.5 kg/m, then weight per foot = 4.5 ร— 0.3048 = 1.372 kg/ft. Our calculator shows both values automatically.
What is the weight formula for pipe in tons (MT)?โ–ผ
Calculate the total weight in kg first using the formula, then divide by 1000 to get metric tons (MT). For example, 2500 kg รท 1000 = 2.5 MT. This is useful for large procurement orders.
Is the pipe weight formula the same for all pipe standards?โ–ผ
The physics formula is the same, but actual weights can vary slightly between standards (IS, ASTM, DIN, BS) because they specify different OD and thickness tolerances. Always use the actual measured dimensions for critical calculations.

๐Ÿ”— Apply These Formulas

๐Ÿ”ต MS Pipe Calculator ๐ŸŸข GI Pipe Calculator ๐ŸŸฆ Square Pipe Calculator ๐Ÿ”ท Rectangular Pipe ๐Ÿ“Š Weight Charts

๐Ÿ“ Formula Quick Reference

โญ• Round Pipe
(OD โˆ’ t) ร— t ร— 0.02466
โฌœ Square Pipe
4(W โˆ’ t) ร— t ร— 0.00785
โ–ฌ Rectangular Pipe
(2(W+H) โˆ’ 4t) ร— t ร— 0.00785

๐Ÿ”ข Constants

ฯ€3.14159
Steel density7850 kg/mยณ
Round constant0.02466
SHS/RHS constant0.00785

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