Four reference tools for working out what a pipe weighs, what wall thickness a schedule gives it, and what the nominal size actually measures. The dimension figures behind them come from the ASME B36.10M and B36.19M tables.
The tools
| Tool | What it answers |
|---|---|
| Steel Pipe Weight Calculator | The nominal weight per metre of any outside diameter and wall thickness, from the standard formula at a steel density of 7.85 g/cm³. |
| Steel Pipe Weight Chart | Nominal weight from NPS 1/8 to NPS 24 in SCH 10, SCH 40 (STD), SCH 80 (XS) and SCH 160, in kilograms per metre and per foot. |
| Pipe Schedule Chart | The wall thickness for every schedule in ASME B36.10M, and the stainless schedules in ASME B36.19M, with the outside diameter each is measured against. |
| Steel Pipe Size Chart | The outside diameter, the DN equivalent and the inside diameter for SCH 40 and SCH 80 pipe from NPS 1/8 to NPS 24. |
How to use them in order
- Start with the size chartNominal size is a label, not a measurement. NPS 6 is 168.3 mm outside diameter regardless of the wall thickness, and the bore is what changes with the schedule.
- HS codes – the tariff headings for steel pipe, fittings, flanges and sucker rods
- Then the schedule chartA schedule is a wall thickness series, not a pressure rating. For a given size, a higher schedule number means a thicker wall, and the external diameter stays the same.
- Then the weight chart or the calculatorIf the size and schedule are both in the chart, read the weight off it. If the wall thickness is not a standard schedule, or the outside diameter is not in the table, use the calculator.
These are nominal weights. The weight that governs a purchase order is the actual weight, calculated from the actual wall thickness under the tolerance of the standard the pipe is made to.
Downloadable charts
Every chart on these pages is also a one-page PDF. They are free to download and to pass on, with no form and no email address.
| Download | What is in it |
|---|---|
| Steel pipe weight chart (PDF) | Nominal weight per metre and per foot, NPS 1/8 to 24, in SCH 10, SCH 40 (STD), SCH 80 (XS) and SCH 160, from the ASME B36.10M dimensions. |
| Pipe schedule wall thickness chart (PDF) | Wall thickness for every schedule in ASME B36.10M and the ASME B36.19M stainless schedules, listed against the outside diameter each is measured on. |
| Steel pipe size & dimensions chart (PDF) | Outside diameter, DN equivalent and inside diameter for SCH 40 and SCH 80 pipe from NPS 1/8 to 24. |
| Product line card (PDF) | The five product lines, the standards and grades behind each, and the documents that travel with an order. |
The weight calculator needs no download — it runs on this site. The line card has its own page, which sets out what is on it.
Related pages
- Steel pipe standards & grades – what each grade requires and how to choose between them
- ASTM A106 Grade B pipe – the seamless specification for high-temperature service
- API 5L X65 PSL2 pipe – the line pipe grade behind most transmission pipelines
- What drives the price – the five things a quotation is built from, and why we do not publish a list
- Applications – how the service decides the specification
- Request a quotation – send the size, schedule, grade, quantity and destination port
Frequently asked questions
What is the difference between nominal size and outside diameter?
Nominal size is a label used to identify the pipe; outside diameter is the actual measurement fixed by the standard. NPS 6 pipe is 168.3 mm outside diameter whatever schedule it is, because the standard keeps the outside diameter constant and varies the wall thickness to change the bore. That is why nominal size in inches does not match the measurement in millimetres.
Is a schedule a pressure rating?
No. A schedule is a wall thickness series belonging to the size. The wall thickness in turn gives the pipe a pressure capability, but the pressure capability depends on the material grade, the temperature and the design code as well, so the schedule on its own does not tell you what pressure the pipe will hold.
Why does my calculated weight differ from the mill certificate?
The chart and the calculator give nominal weight, computed from nominal outside diameter and nominal wall thickness. Mill certificates report actual weight, from actual dimensions that sit within the tolerance of the standard. A difference of a few percent is expected, and the contract weight is normally the theoretical weight calculated from the standard dimensions.
Can these charts be used for stainless steel?
The schedule chart covers stainless steel pipe separately, because stainless schedules are listed by wall thickness rather than by a numbered series in the same way. The weight relationship itself is the same; only the density differs slightly from carbon steel, which is why the calculator states the density it uses.
Send the size, schedule or wall thickness, the grade, the quantity and the destination port. We reply with availability and pricing. Have the size and schedule but need a price?
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