18" pipe weight and dimensions

104.76 lb/ft · 155.93 kg/m (Sch 40)

18" nominal pipe size (DN) has an outside diameter of 18 in (457.2 mm). Schedule 40 has a 0.562 in (14.27 mm) wall and weighs 104.76 lb per foot.

18" pipe weight calculator

Total weight
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18" pipe schedules

ScheduleWall (in)Wall (mm)ID (in)ID (mm)lb/ftkg/m21 ft (lb)6 m (kg)
Schedule 5S 0.1654.19 17.670448.8 31.4646.82 661280.9
Schedule 10 0.2506.35 17.500444.5 47.4470.60 996423.6
Schedule 20 0.3127.92 17.376441.4 58.9987.81 1,239526.9
Schedule 40S 0.3759.52 17.250438.2 70.65105.16 1,484631.0
Standard (STD) 0.3759.52 17.250438.2 70.65105.16 1,484631.0
Schedule 30 0.43711.10 17.126435.0 82.05122.11 1,723732.7
Schedule 80S 0.50012.70 17.000431.8 93.54139.22 1,964835.3
Extra strong (XS) 0.50012.70 17.000431.8 93.54139.22 1,964835.3
Schedule 40 0.56214.27 16.876428.7 104.76155.93 2,200935.6
Schedule 60 0.75019.05 16.500419.1 138.30205.84 2,9041,235.0
Schedule 80 0.93723.80 16.126409.6 170.91254.38 3,5891,526.3
Schedule 100 1.15629.36 15.688398.5 208.15309.81 4,3711,858.9
Schedule 120 1.37534.92 15.250387.4 244.37363.71 5,1322,182.3
Schedule 140 1.56239.67 14.876377.9 274.48408.52 5,7642,451.1
Schedule 160 1.78145.24 14.438366.7 308.79459.59 6,4852,757.5

Schedules with an S suffix (5S, 10S, 40S, 80S) are stainless steel pipe per ASME B36.19M; weights shown are for carbon steel, so multiply by about 1.01 for stainless steel.

Weight filled with water and flow area

For supports and hangers, add the weight of the contents. Water weighs 62.4 lb/ft³ (1000 kg/m³).

ScheduleFlow area (in²)Flow area (cm²)Water (lb/ft)Pipe + water (lb/ft)Pipe + water (kg/m)
Schedule 5S245.221,582.1 106.31137.77205.03
Schedule 10240.531,551.8 104.27151.71225.78
Schedule 20237.131,529.9 102.80161.79240.80
Schedule 40S233.711,507.8 101.32171.97255.94
Standard (STD)233.711,507.8 101.32171.97255.94
Schedule 30230.361,486.2 99.87181.92270.73
Schedule 80S226.981,464.4 98.40191.94285.66
Extra strong (XS)226.981,464.4 98.40191.94285.66
Schedule 40223.681,443.2 96.97201.73300.25
Schedule 60213.821,379.5 92.70231.00343.79
Schedule 80204.241,317.7 88.54259.45386.15
Schedule 100193.301,247.1 83.80291.95434.52
Schedule 120182.651,178.5 79.18323.55481.56
Schedule 140173.801,121.4 75.35349.83520.66
Schedule 160163.721,056.2 70.98379.77565.21

Wall thickness by schedule

Sch 5S 4.19 mm Sch 10 6.35 mm Sch 20 7.92 mm Sch 40S 9.52 mm STD 9.52 mm Sch 30 11.1 mm Sch 80S 12.7 mm XS 12.7 mm Sch 40 14.27 mm Sch 60 19.05 mm Sch 80 23.8 mm Sch 100 29.36 mm Sch 120 34.92 mm Sch 140 39.67 mm Sch 160 45.24 mm

Cross-section (Sch 40)

OD 457.2 mm (18 in)

Drawn to scale.

How the weight is calculated

Weight per foot = 10.69 × (OD − t) × t = 10.69 × (18 − 0.562) × 0.562 = 104.76 lb/ft.

The factor 10.69 is the density of carbon steel (0.2836 lb/in³) × π × 12 in/ft.

A large-diameter steel pipe with a cut pipe section on the ground
Photo: Fumikas Sagisavas, Wikimedia Commons, CC0.

Frequently asked questions

How much does 18" Schedule 40 pipe weigh?

18" Sch 40 pipe weighs 104.76 lb/ft (155.93 kg/m). A 21 ft random length weighs about 2,200 lb and a 6 m length about 935.6 kg.

What is the outside diameter of 18" pipe?

18 in (457.2 mm). The outside diameter is the same for every schedule; a higher schedule means a thicker wall and a smaller inside diameter.

How much does 18" Schedule 40 pipe weigh full of water?

201.73 lb/ft: 104.76 lb/ft of steel plus 96.97 lb/ft of water (300.25 kg/m in total). Use this for pipe support and hanger loads.

What is the inside diameter of 18" Schedule 40 pipe?

16.876 in (428.7 mm), from OD − 2 × wall = 18 − 2 × 0.562.

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Dimensions per ASME B36.10M-2015, adapted from Wikipedia, "Nominal Pipe Size" (CC BY-SA 4.0). Weights are plain-end carbon steel; verify with the mill certificate.