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# Calculate Pipe Weight

## Weight calculating formula for steel pipes ### Weight of Empty Pipe

Weight of empty pipe per unit length can be calculated as

wpρm Am

= ρm π (do2 - di2) / 4

= (π / 4) ρm (do2 - di2)                               (4)

where

wpweight of empty pipe per unit length (kg/m, lb/in)

ρm = density of pipe material (kg/m3, lb/in3)

Am = cross-sectional wall area of pipe (m2, in2)

do = outside diameter (m, in)

di = do - 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

wl = ρl Ai

= ρl π (di / 2)2

= (π / 4) ρl di2                                    (5)

where

wl = weight of liquid in pipe per unit length of pipe (kg, lb)

Ai = cross-sectional inside area of pipe (m2, in2)

ρl = density of liquid (kg/m3, lb/in3)

### Weight of Pipe with Liquid

Weight of pipe with liquid can be calculated as

w = wp + wi

= ρm Am + ρl Ai

=  (ρm π (do2 - di2) / 4) + (ρl π di2 / 4)

= (π / 4) [ρm (do2 - di2) + ρl di2]                      (6)

#### 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.

do - outside diameter (m, in)

di - inside diameter (m, in)

ρm - density of piping material (kg/m3, lb/in3)

ρldensity of liquid (kg/m3, lb/in3) (zero for empty pipe)

• 1 m = 103 mm
• 1 m2 = 106 mm2
• 1 in = 1/12 ft
• 1 in2 = 1/144 ft2
• 1 lb/in3 = 1728 lb/ft2

### 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/ft3 (0.28 lb/in3). The weight per inch length of empty pipe can be calculated as

m = (π / 4) (0.28 lb/in3) ((4.500 in)2 - (4.026 in)2)

= 0.89 lb/in

= 10.7 lb/ft

### Example - Weight of 4" Schedule 40 Steel Pipe with Water - SI Units

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/m3. The density of water is 1000 kg/m3.  The weight per m length of pipe filled with water can be calculated as

m = (π / 4) [(7850 kg/m3)((0.1143 m)2 - (0.1023 m)2) + (1000 kg/m3) (0.1023 m)2

= 26.3 kg/m

## Related Topics

• Dimensions - Sizes and dimensions of pipes and tubes, and their fittings - inside and outside diameter, weight and more

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• en: pipe weight calculation

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## Citation

• Engineering ToolBox, (2004). Calculate Pipe Weight. [online] Available at: https://www.engineeringtoolbox.com/pipe-weight-calculation-d_745.html [Accessed Day Mo. Year].

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