Steel Pipe Size Chart and Schedules

This steel pipe size chart provides a quick reference for pipe dimensions, including nominal pipe sizes, schedules, wall thickness, and weight per foot. A printable PDF version is available below.

VIEW PIPE CHART (PDF)

Steel Pipe Dimensions Chart: Pipe Size Chart with OD, Wall Thickness and Weight

Quick-reference dimensions for 1/2″ through 12″ nominal pipe sizes are shown below. For larger sizes and additional schedules through 36″, download the full pipe chart.

Weights are theoretical plain-end values in pounds per foot. Refer to the mill test report for exact figures. Our domestic A-135 lightwall in 8″ Schedule 10 has a 0.188″ wall.

How to Read a Pipe Size Chart

Nominal Pipe Size (NPS) and Outside Diameter

NPS is a standard naming system, not an actual measurement. For 1/8″ through 12″, the outside diameter (OD) is larger than the nominal size. From 14″ and up, NPS equals OD. Each size keeps the same OD across every schedule.

Schedule 10, 40 and 80 on a Pipe Size Chart

Schedule sets the wall thickness for a given pipe size. As the schedule number goes up, the wall gets thicker and the inside diameter (ID) gets smaller, while the OD stays the same. Schedule 10 is a lightwall pipe common in fire protection and grooved systems, Schedule 40 covers general piping, and Schedule 80 has a thicker wall for higher pressure and industrial use. For example, 2″ Schedule 40 weighs 3.66 lb/ft, while 2″ Schedule 80 weighs 5.03 lb/ft.

STD and XS Equivalents

Older weight classes still appear on specs and mill certs. Standard weight (STD) matches Schedule 40 through 10″, and extra strong (XS) matches Schedule 80 through 8″. Above those sizes the walls differ, so check the full pipe size chart PDF.

How to Find Inside Diameter (ID)

Subtract twice the wall thickness from the OD (ID = OD − 2 × wall). For 2″ Schedule 40, the ID is 2.375″ − 2 × 0.154″ = about 2.067″.

Steel Pipe Weight per Foot: Using the Pipe Size Chart

Weight per foot depends on OD and wall thickness, so it rises with each schedule. For plain-end carbon steel pipe, weight (lb/ft) = 10.69 × (OD − wall) × wall, with OD and wall in inches. For 2″ Schedule 40: 10.69 × (2.375 − 0.154) × 0.154 = about 3.66 lb/ft.

Weight per foot affects freight, handling, and storage. Comparing weights helps distributors estimate landed cost and plan mixed loads.

To calculate weight for any size, wall thickness, length, and quantity, use our pipe weight calculator.

Steel Pipe Products in Schedule 10, 40 and 80

United Pipe & Steel supplies lengths of steel pipe only, with no fittings. Choose the product that fits your order:

• Domestic welded steel pipe: continuous weld and ERW, black and galvanized
• Globally sourced welded steel pipe: ERW, black and galvanized
• Globally sourced seamless steel pipe: A106 for higher temperature and pressure

Need a different size, schedule, or finish? Call 800-777-7473. We evaluate every request.

Related Steel Pipe Resources

• Pipe weight calculator
• Carbon Steel pipe products
• Steel pipe price sheets
• Standards and specifications guide
• ASTM A53 Pipe
• Wheatland Tube: ASTM A53 Grade B Type F technical reference (PDF). Pipe dimensions follow ASME B36.10M.