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Pipe Inside Diameter and Flow Area Chart

Pipe inside diameter chart with the bore, internal flow area and contained volume per metre for Sch 40 and Sch 80 pipe.

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Inside diameter, flow area and volume

NPSDNSch 40 ID mmSch 40 area cm²Sch 40 L/mSch 80 ID mmSch 80 area cm²Sch 80 L/m
1/866.840.370.0375.480.240.024
1/489.220.670.0677.660.460.046
3/81012.481.220.12210.700.900.090
1/21515.761.950.19513.841.500.150
3/42020.963.450.34518.882.800.280
12526.645.570.55724.304.640.464
1 1/43235.089.670.96732.508.300.830
1 1/24040.9413.161.31638.1411.421.142
25052.4821.632.16349.2219.031.903
2 1/26562.6830.863.08658.9827.322.732
38077.9247.694.76973.6642.614.261
3 1/29090.1263.796.37985.4457.335.733
4100102.2682.138.21397.1874.177.417
5125128.20129.0812.908122.24117.3611.736
6150154.08186.4618.646146.36168.2416.824
8200202.74322.8332.283193.70294.6829.468
10250254.46508.5450.854242.82463.0846.308
12300303.18721.9272.192288.84655.2565.525
14350333.34872.7087.270317.50791.7379.173
16400381.001140.09114.009363.521037.88103.788
18450428.461441.82144.182409.341316.01131.601
20500477.821793.16179.316455.621630.40163.040
22550501.841977.97197.797
24600575.042597.08259.708548.082359.27235.927
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About this Table

Pipe inside diameter chart with the bore, internal flow area and contained volume per metre for Sch 40 and Sch 80 pipe.

Basis: Calculated from ASME B36.10M OD and wall: ID = OD − 2t, area = π ID² ÷ 4, volume per metre in litres = area in cm² ÷ 10.

How to use

  1. Use the ID for flow velocity and flowmeter sizing.
  2. Velocity in m/s = flow in m³/h ÷ (area in cm² × 0.36).
  3. Use L/m for line fill volumes and hydrotest water.

Notes

  • Flowmeter sizing should use the actual pipe ID, not the DN.

Related tools

Pipe Flow Velocity CalculatorFree on instrumentationblog.inPipe Sizing CalculatorFree on instrumentationblog.inMagnetic Flow Meter SizingFree on instrumentationblog.in
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Frequently Asked Questions

What is the ID of 4 inch Sch 40 pipe?

102.26 mm.

How do I get velocity from flow?

v (m/s) = Q (m³/h) ÷ (A (cm²) × 0.36).

Why is DN not the inside diameter?

DN is a size label. The real bore depends on OD and schedule.

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