316 Stainless Steel Pipe Weight Chart: Metric and Inch Sizes Explained

A 316 stainless steel pipe weight chart turns a dimensional schedule into a mass figure that can be read off in seconds, which is exactly what a buyer needs when pricing a shipment, booking freight or checking that a support structure will carry the line. This chart lists outside diameter, nominal size, wall thickness and mass per metre for the sizes used most often in process, marine and food-grade piping, and explains how to use the values correctly.

What a Weight Chart Does and Does Not Tell You

A chart is a nominal reference, not a certificate. Every figure printed below is calculated from nominal outside diameter and nominal wall thickness using the standard round-pipe formula and the density basis of 316 stainless steel. It is accurate enough for budgeting, freight classification and structural loading estimates. It is not a substitute for the mass recorded on a mill test certificate, which reflects the actual dimensions and density of the heat supplied.

Use the chart for: quotations, container loading plans, crane and rigging selection, and preliminary structural checks.

Use certified values for: final invoicing by weight, lifting plans that are governed by a safety factor, and any acceptance test that quotes a mass tolerance.

316 Stainless Steel Pipe Weight Chart (Metric and Inch Sizes)

Mass per metre is calculated as outside diameter minus wall thickness, multiplied by wall thickness, multiplied by 0.02491, with both dimensions in millimetres. The pound per foot column is the same value converted at 0.67197 lb/ft per kg/m.

Outside diameter (mm)	Nominal size	Outside diameter (in)	Wall thickness (mm)	Mass per metre (kg/m)	Mass per foot (lb/ft)
19.05	Tube OD 3/4 in	0.750 in	1.65	0.715	0.481
25.40	Tube OD 1 in	1.000 in	2.11	1.224	0.823
33.40	NPS 1	1.315 in	2.77	2.114	1.420
42.16	NPS 1-1/4	1.660 in	2.77	2.718	1.827
48.26	NPS 1-1/2	1.900 in	2.77	3.139	2.109
60.33	NPS 2	2.375 in	3.05	4.352	2.925
73.03	NPS 2-1/2	2.875 in	3.05	5.317	3.573
88.90	NPS 3	3.500 in	3.05	6.523	4.383
114.30	NPS 4	4.500 in	3.05	8.453	5.680
141.30	NPS 5	5.563 in	3.40	11.681	7.849
168.30	NPS 6	6.625 in	4.78	19.473	13.085
219.10	NPS 8	8.625 in	6.35	33.656	22.616
273.05	NPS 10	10.750 in	7.11	47.106	31.654
323.85	NPS 12	12.750 in	7.92	62.336	41.888
355.60	NPS 14	14.000 in	9.53	82.164	55.211
406.40	NPS 16	16.000 in	9.53	94.225	63.316

Note that nominal pipe size is not the same as outside diameter. The outside diameter is fixed for a given nominal size across all schedules, and only the wall thickness changes; that is why a Schedule 80 pipe of the same nominal size is heavier than a Schedule 40 pipe. Where a size is described as tube outside diameter rather than nominal pipe size, the inch column gives the actual measured outside diameter in inches so that the two systems can be compared directly.

How to Read the Chart Correctly

Start from the outside diameter in millimetres. Outside diameter is the controlling dimension in the formula; nominal size is only a convenient label.

Check the wall thickness against the schedule. A chart row is valid only for the wall thickness printed beside it. Substituting a heavier wall changes the mass per metre substantially.

Watch the mixing of tube and pipe. Tube sizes are quoted by outside diameter, pipe sizes by nominal bore. The same nominal figure can describe two different outside diameters.

Multiply by the ordered length last. Always compute mass per metre first, then multiply by the cut length, so that a length change does not require the whole calculation to be repeated.

Chart Values Versus Calculated Values

A chart and the formula should agree, and any difference usually has one of three causes. The first is the constant: charts built on the 304 density basis use 0.02491, while a value for 316 at 8.00 g/cm3 uses 0.02513, about 0.9% higher. The second is the dimensional basis, since nominal wall thickness differs from the delivered wall within the tolerance of the applicable specification. The third is whether the chart quotes mass per metre or mass per foot, since mixing the two without conversion introduces a factor of 1.48816.

Where the applicable product specification sets a mass tolerance for the delivered pipe, a chart value should be treated as the nominal centre of that band rather than as a guaranteed figure.

Unit Conversions for Estimating

To convert	Multiply by	Worked example
kg/m to lb/ft	0.67197	5.490 kg/m x 0.67197 = 3.689 lb/ft
lb/ft to kg/m	1.48816	3.689 lb/ft x 1.48816 = 5.490 kg/m
kg/m to kg per 6 m length	6.000	5.490 kg/m x 6 = 32.94 kg
lb/ft to lb per 20 ft length	20.000	3.689 lb/ft x 20 = 73.78 lb

Keeping one unit system from start to finish removes most estimating errors. If the purchase order is written in feet, convert the chart to pounds per foot once and stay in imperial units; if the enquiry is metric, stay in kilograms per metre.

Frequently Asked Questions

Q: How do I use a 316 stainless steel pipe weight chart?
Identify the outside diameter and the wall thickness of the pipe you are buying, read the mass per metre for that combination, then multiply by the total length. For imperial quotations, use the pound per foot column and multiply by the length in feet.

Q: Is a pipe weight chart the same as a mill test certificate?
No. A chart gives nominal mass calculated from nominal dimensions, while a mill test certificate reports the actual mass of the delivered material. Certified values should be used for invoicing and for lifting plans.

Q: Why is Schedule 80 heavier than Schedule 40 in the same size?
Because Schedule 80 has a thicker wall while the outside diameter stays the same. The extra metal in the annulus increases mass per metre, which is the whole purpose of the heavier schedule.

Q: Does nominal pipe size equal outside diameter?
No. Nominal pipe size is a label that groups pipes with the same outside diameter across different schedules. For NPS 6, for example, the outside diameter is 168.3 mm regardless of whether the pipe is Schedule 10 or Schedule 80.

Q: How much does a 6 m length of 316 pipe weigh?
Multiply the mass per metre by six. A 60.33 mm outside diameter pipe with a 3.05 mm wall gives 4.61 kg/m, so a 6 m length is about 27.7 kg, ignoring the small trim allowance at the ends.

Q: Which density is used for the chart?
The chart uses the standard metric constant 0.02491, which corresponds to a density of about 7.93 g/cm3. For 316 and 316L the density is closer to 7.98-8.00 g/cm3, so a value calculated at 0.02513 will be about 0.9% higher.