Pipe Calculator
Pipe calculator — weight per meter, paint area, internal volume. Supports round, square, and rectangular profiles. Online and free.
Example: 57 mm, 89 mm, or 108 mm for water and gas pipes
Standard: 2–4 mm for square tube, 3–4 mm for round steel
Length of one section — typical mill lengths are 6 or 12 m
Calculation formula
Weight = Cross-section area (mm²) × Length (m) × 7850 ÷ 1,000,000
Round cross-section: π × (D² − d²) ÷ 4. Rectangular: A × B − (A − 2t) × (B − 2t). Steel density 7850 kg/m³.
About the pipe calculator
The pipe calculator computes weight per meter, paintable surface area, and internal volume for round and rectangular steel pipes. It works for electric-welded, seamless, and square profiles used in fences, trusses, and plumbing.
Enter outer diameter and wall thickness for round pipe, or two sides and wall thickness for square / rectangular profile — final weight is calculated using a steel density of 7850 kg/m³ with no intermediate rounding.
All calculations run directly in your browser: nothing is sent to a server, and the page works offline once it has loaded.
Benefits
Round and square in one
Two modes in one calculator: round, electric-welded, and square / rectangular profile
Three values at once
Weight in kg, paintable area in m², and internal volume in liters from a single calculation
Accurate steel density
Computed at 7850 kg/m³ — matches reference tables and supplier data sheets
FAQ
How is pipe weight per meter calculated?
Cross-section area is multiplied by 1 meter length and a steel density of 7850 kg/m³. For a 57×3.5 round pipe this gives about 4.62 kg/m, matching standard reference tables.
What square tube do I need for a fence?
Posts for a profnastil fence are usually 60×60×2 mm or 50×50×2 mm, with 40×20×2 mm for horizontal rails. The calculator gives the weight of each 3 or 6 m section so you can order the right total tonnage.
How do I calculate a truss from square tube?
Set chord size first (for example 40×40) and the span length, then size the web members (20×20). Sum the masses of every element to get truss weight for sizing the supports.
Why does surface area matter?
You need it to estimate primer and paint: a typical metal enamel uses 100–150 g/m² per coat. Multiply the area from the calculator by consumption and the number of coats.
How do I use internal pipe volume?
Internal volume in liters is needed for heating and plumbing: add up the volume of every pipe run, the boiler, and radiators to get the total coolant volume.
Does it work for stainless steel or aluminum?
The calculator uses steel density 7850 kg/m³. For stainless steel (~7900) the difference is within 1%; for aluminum (2700) multiply the result by 0.344, and for copper (8960) by 1.14.