Pipe Weight Calculator
Weight calculating equation for steel pipes.
Weight of Empty Pipe
Weight of empty pipe per unit length can be calculated as
w_{p} = ρ_{m} A_{m}
= ρ_{m} π (d_{o}^{2 }  d_{i}^{2}) / 4
= (π / 4) ρ_{m} (d_{o}^{2 }  d_{i}^{2}) (1)
where
w_{p} = weight of empty pipe per unit length (kg/m, lb/in)
ρ_{m} = density of pipe material (kg/m^{3}, lb/in^{3})
A_{m} = crosssectional wall area of pipe (m^{2}, in^{2})
d_{o} = outside diameter (m, in)
d_{i} = d_{o}  2 t = inside diameter (m, in)
t = wall thickness (m, in)
Weight of Liquid in Pipe
Weight of liquid in pipes per unit length can be calculated as
w_{l} = ρ_{l} A_{i}
= ρ_{l} π (d_{i} / 2)^{2}
= (π / 4) ρ_{l} d_{i}^{2} (2)
where
w_{l} = weight of liquid in pipe per unit length of pipe (kg, lb)
A_{i} = crosssectional inside area of pipe (m^{2}, in^{2})
ρ_{l} = density of liquid (kg/m^{3}, lb/in^{3})
Weight of Pipe with Liquid
Weight of pipe with liquid can be calculated as
w = w_{p} + w_{i}
= ρ_{m} A_{m} + ρ_{l} A_{i}
= (ρ_{m} π (d_{o}^{2 }  d_{i}^{2}) / 4) + (ρ_{l} π d_{i}^{2} / 4)
= (π / 4) [ρ_{m} (d_{o}^{2 }  d_{i}^{2}) + ρ_{l} d_{i}^{2}] (3)
Weight of Pipe Calculator
This calculator can be used to calculate the weight of a pipe with  or without  liquid. The calculator is generic and can be used for both SI and Imperial units as long as the use of units are consistent.
d_{o}  outside diameter (m, in)
d_{i}  inside diameter (m, in)
ρ_{m}  density of piping material (kg/m^{3}, lb/in^{3})
ρ_{l}  density of liquid (kg/m^{3,} lb/in^{3}) (zero for empty pipe)
 1 m = 10^{3} mm
 1 m^{2} = 10^{6} mm^{2}
 1 in = 1/12 ft
 1 in^{2} = 1/144 ft^{2}
 1 lb/in^{3} = 1728 lb/ft^{2}
Example  Weight of 4" Schedule 40 Steel Pipe with Water  SI Units (default values in the calculator above)
The outside diameter of 4" Schedule 40 Steel Pipe is 114.3 mm. The inside diameter is 102.3 mm. The density of steel is 7850 kg/m^{3}. The density of water is 1000 kg/m^{3}.
The weight of empty pipe per unit length can be calculatet with (1) as:
w_{p} = (π / 4) (7850 kg/m^{3}) ((0.1143 m)^{2 }  (0.1023 m)^{2})
= 16 kg/m
The weight of the liquid in the pipe per unit length can be calculatet with (2) as:
w_{l} = (π / 4) (1000 kg/m^{3}) (0.1023 m)^{2}
= 8.2 kg/m
The weight of pipe filled with water per unit length can be calculated with (3) as
w = (π / 4) [(7850 kg/m^{3})((0.1143 m)^{2 }  (0.1023 m)^{2}) + (1000 kg/m^{3}) (0.1023 m)^{2}]
= 24.2 kg/m
Example  Weight of 4" Schedule 40 Steel Pipe
The outside diameter of 4" Schedule 40 Steel Pipe is 4.500 inches. The wall thickness is 0.237 inches and the inside diameter is 4.026 in. The density of steel is 490 lb/ft^{3} (0.28 lb/in^{3}). The weight of empty pipe per unit length can be calculated as
w = (π / 4) (0.28 lb/in^{3}) ((4.500 in)^{2}  (4.026 in)^{2})
= 0.89 lb/in
= 10.7 lb/ft
Typical Weight of Schedule 40 Steel Pipe with/without Water
Nominal Pipe Size  Weight of Pipe  Weight of Pipe filled with Water  

(in)  (mm)  (lbs/ft)  (kg/m)  (lbs/ft)  (kg/m) 
3/8  10  0.6  0.9  0.7  1.0 
1/2  15  0.8  1.2  0.9  1.2 
3/4  20  1.1  1.7  1.3  2.0 
1  25  1.7  2.5  2.1  3.0 
1 1/4  32  2.3  3.4  2.9  4.3 
1 1/2  40  2.7  4.0  3.6  5.3 
2  50  3.6  5.4  5.0  7.5 
2 1/2  65  5.8  8.6  7.9  11.7 
3  80  7.6  11.2  10.8  15.9 
3 1/2  90  9.1  13.5  13.4  19.8 
4  100  10.8  16.0  16.3  24.2 
5  125  14.6  21.7  23.2  34.6 
6  150  19.0  28.2  31.5  46.8 
8  200  28.5  42.5  50.1  74.6 
10  250  40.5  60.2  74.6  111 
12  300  51.1  75.9  102  152 
14  350  63.0  93.7  122  181 
16  400  83.0  124  160  237 
18  450  105  156  202  301 
20  500  123  183  243  362 
24  600  171  255  345  514 
Weight of Insulation on Pipe
Weight of stone wool insulation mat on pipe.
Nominal Diameter  Outside Diameter (mm)  Weight of Insulation (kg/m pipe)  

Insulation Thichness (mm)  
(mm)  (in)  30  40  50  60  80  100  120  140  
15  ½  21.3  4  5  6  8  11  15  19  24 
25  1  33.7  4  5  7  8  12  15  20  25 
50  2  60.3  5  7  8  10  13  17  22  27 
65  2½  76.1  6  7  9  10  14  18  23  28 
80  3  88.9  7  8  10  11  15  19  24  29 
100  4  114.3  8  9  11  12  16  21  26  31 
200  8  219.1  12  14  16  18  23  28  33  39 
300  12  323.9  17  19  21  24  29  35  41  47 
500  20  508.0  25  28  31  34  40  47  54  62 
700  28  711.0  34  37  41  44  52  60  69  78 
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