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Maryland Metrics -- Steel tubes
Some practical formulas & calculators


      • Square and rectangular carbon (black) steel tubes
        Weight per meter in kg/m & lb/ft
      • Round carbon (black) steel tubes and round
        alloyed and high alloyed steel tubes

        Weight per meter in kg/m & lb/ft for carbon steel tubes
        Weight per meter in kg/m & lb/ft for alloyed tubes
      • Weight conversion for any steel tube from kg/m & lb/ft

Square and rectangular carbon (black) steel tubes:

Weight per meter in kg/m & lb/ft
kg/m = (Oc - 4Wt) * Wt * 0.00785


Square Tube

Rectangular tube

Oc = outside diameter, Wt = wall thickness
For square steel tubes: Oc = 4*a
For rectangular steel tubes: Oc = 2a + 2b

(1) Example for square steel tube 40 * 40 * 2 mm (40/40/2 mm)

Oc = 4*a = 160
Wt = 2
(160 - 8) * 2 * 0.00785 = 2.39 kg/m

Calculation for any carbon square steel tube
Enter a
Enter Wt
Weight
in mm
in mm
kg/m
lb/ft




(2) Example for rectangular steel tube 40 * 20 * 2 mm (40/20/2 mm)
Oc = 2a + 2b = 80 + 40 = 120
(120 - 8) * 2 * 0.00785 = 1.76 kg/m

Calculation for any carbon rectangular steel tube
Enter a
Enter b
Enter Wt
Weight
in mm
in mm
in mm
kg/m
lb/ft



Round carbon (black) steel tubes

Weight per meter kg/m for round carbon steel tubes
kg/m = (Od - Wt) * Wt * 0.02466

 

Round alloyed and high alloyed steel tubes

Weight per meter kg/m for alloyed tubes
Kg/m = (Od - Wt) * Wt * 0.02505

Id = inside diameter
l = tube length
Od = outside diameter
Wt = wall thickness

(1) Example for steel tube 33.7/3,25 in quality St 37 (carbon)
(33.7 - 3.25) * 3.25 * 0.02466 = 2.44 kg/m

Weight Calculation for any carbon steel tube
Enter Od
Enter Wt
Weight
in mm
in mm
kg/m
lb/ft

 

(2) Example for the same tube in quality DIN Work Norm Number 1.4571 (alloyed SS)
(33.7 - 3.25) * 3.25 * 0.02505 = 2.48 kg/m

Weight Calculation for any alloyed steel tube
Enter Od
Enter Wt
Weight
in mm
in mm
kg/m
lb/ft


weight conversion for any steel tube:

Lb/ft = kg/m x 0.6719969;                               kg/m = lb/ft x 1.488164


Conversion: kg/m to lb/ft
Enter kg/m: lb/ft:

 

Conversion: lb/ft to kg/m
Enter lb/ft: kg/m:

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