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Mechanical Engineering · Piping

Pipe Schedule Chart

Compare common steel pipe schedules by NPS, DN, outside diameter, wall thickness, calculated inside diameter, flow area, weight, and water capacity. Select any listed combination to update the dimensioned cross-section.

Basis
ASME B36.10-2022
Schedules
10, 40, 80, 160
Range
NPS 1/2–12
Rows
59 valid combinations

Interactive dimension lookup

Select a Pipe Size and Schedule

Choose a valid schedule for the selected NPS. The diagram and calculated values update immediately.

Pipe cross-section for NPS 2 Schedule 40Circular steel pipe cross-section showing outside diameter, calculated inside diameter, and nominal wall thickness.NPS 2 · Schedule 40OD 2.375 in · ID 2.067 in
The bore-to-OD ratio is scaled from the selected dimensions. Very thin walls retain a minimum visible width so the section remains readable.
Selected pipe
NPS 2 · DN 50 · Sch 40
Outside diameter
2.375 in
Wall thickness
0.154 in
Calculated inside diameter
2.067 in
Calculated flow area
3.356 in²
Approximate weight
3.65 lb/ft
Water capacity
0.174 gal/ft

Schedule is not a pressure rating. Allowable pressure also depends on material specification, temperature, manufacturing tolerance, corrosion allowance, joining method, and the governing piping code.

Find the smallest pipe meeting a minimum inside diameter

Enter a minimum bore and choose a schedule.

Searchable dimensional reference

Pipe Schedule 10, 40, 80, and 160 Dimensions

Common ASME B36.10 wrought-steel combinations from NPS 1/2 through NPS 12.

Search by NPS, DN, schedule, STD, or XS. Select up to six rows to compare one physical property at a time.

Limited educational reference for common ASME B36.10 wrought-steel schedules. OD and wall thickness are nominal source values; ID, area, weight, and capacity are calculated.
DesignationDimensionsFlow geometryMassCapacity
NPS 1/2 · Sch 10 DN 15 10 — 0.840 in
21.34 mm		 0.083 in
2.11 mm		 0.674 in
17.12 mm		 0.357 in²
230 mm²		 0.67 lb/ft
1.00 kg/m		 0.019 gal/ft
0.23 L/m
NPS 1/2 · Sch 40 DN 15 40 STD 0.840 in
21.34 mm		 0.109 in
2.77 mm		 0.622 in
15.80 mm		 0.304 in²
196 mm²		 0.85 lb/ft
1.27 kg/m		 0.016 gal/ft
0.20 L/m
NPS 1/2 · Sch 80 DN 15 80 XS 0.840 in
21.34 mm		 0.147 in
3.73 mm		 0.546 in
13.87 mm		 0.234 in²
151 mm²		 1.09 lb/ft
1.62 kg/m		 0.012 gal/ft
0.15 L/m
NPS 1/2 · Sch 160 DN 15 160 — 0.840 in
21.34 mm		 0.188 in
4.78 mm		 0.464 in
11.79 mm		 0.169 in²
109 mm²		 1.31 lb/ft
1.95 kg/m		 0.009 gal/ft
0.11 L/m
NPS 3/4 · Sch 10 DN 20 10 — 1.050 in
26.67 mm		 0.083 in
2.11 mm		 0.884 in
22.45 mm		 0.614 in²
396 mm²		 0.86 lb/ft
1.28 kg/m		 0.032 gal/ft
0.40 L/m
NPS 3/4 · Sch 40 DN 20 40 STD 1.050 in
26.67 mm		 0.113 in
2.87 mm		 0.824 in
20.93 mm		 0.533 in²
344 mm²		 1.13 lb/ft
1.68 kg/m		 0.028 gal/ft
0.34 L/m
NPS 3/4 · Sch 80 DN 20 80 XS 1.050 in
26.67 mm		 0.154 in
3.91 mm		 0.742 in
18.85 mm		 0.432 in²
279 mm²		 1.47 lb/ft
2.19 kg/m		 0.022 gal/ft
0.28 L/m
NPS 3/4 · Sch 160 DN 20 160 — 1.050 in
26.67 mm		 0.219 in
5.56 mm		 0.612 in
15.54 mm		 0.294 in²
190 mm²		 1.94 lb/ft
2.89 kg/m		 0.015 gal/ft
0.19 L/m
NPS 1 · Sch 10 DN 25 10 — 1.315 in
33.40 mm		 0.109 in
2.77 mm		 1.097 in
27.86 mm		 0.945 in²
610 mm²		 1.40 lb/ft
2.09 kg/m		 0.049 gal/ft
0.61 L/m
NPS 1 · Sch 40 DN 25 40 STD 1.315 in
33.40 mm		 0.133 in
3.38 mm		 1.049 in
26.64 mm		 0.864 in²
558 mm²		 1.68 lb/ft
2.50 kg/m		 0.045 gal/ft
0.56 L/m
NPS 1 · Sch 80 DN 25 80 XS 1.315 in
33.40 mm		 0.179 in
4.55 mm		 0.957 in
24.31 mm		 0.719 in²
464 mm²		 2.17 lb/ft
3.23 kg/m		 0.037 gal/ft
0.46 L/m
NPS 1 · Sch 160 DN 25 160 — 1.315 in
33.40 mm		 0.250 in
6.35 mm		 0.815 in
20.70 mm		 0.522 in²
337 mm²		 2.84 lb/ft
4.23 kg/m		 0.027 gal/ft
0.34 L/m
NPS 1-1/4 · Sch 10 DN 32 10 — 1.660 in
42.16 mm		 0.109 in
2.77 mm		 1.442 in
36.63 mm		 1.633 in²
1054 mm²		 1.81 lb/ft
2.69 kg/m		 0.085 gal/ft
1.05 L/m
NPS 1-1/4 · Sch 40 DN 32 40 STD 1.660 in
42.16 mm		 0.140 in
3.56 mm		 1.380 in
35.05 mm		 1.496 in²
965 mm²		 2.27 lb/ft
3.38 kg/m		 0.078 gal/ft
0.96 L/m
NPS 1-1/4 · Sch 80 DN 32 80 XS 1.660 in
42.16 mm		 0.191 in
4.85 mm		 1.278 in
32.46 mm		 1.283 in²
828 mm²		 3.00 lb/ft
4.46 kg/m		 0.067 gal/ft
0.83 L/m
NPS 1-1/4 · Sch 160 DN 32 160 — 1.660 in
42.16 mm		 0.250 in
6.35 mm		 1.160 in
29.46 mm		 1.057 in²
682 mm²		 3.76 lb/ft
5.60 kg/m		 0.055 gal/ft
0.68 L/m
NPS 1-1/2 · Sch 10 DN 40 10 — 1.900 in
48.26 mm		 0.109 in
2.77 mm		 1.682 in
42.72 mm		 2.222 in²
1434 mm²		 2.08 lb/ft
3.10 kg/m		 0.115 gal/ft
1.43 L/m
NPS 1-1/2 · Sch 40 DN 40 40 STD 1.900 in
48.26 mm		 0.145 in
3.68 mm		 1.610 in
40.89 mm		 2.036 in²
1313 mm²		 2.72 lb/ft
4.04 kg/m		 0.106 gal/ft
1.31 L/m
NPS 1-1/2 · Sch 80 DN 40 80 XS 1.900 in
48.26 mm		 0.200 in
5.08 mm		 1.500 in
38.10 mm		 1.767 in²
1140 mm²		 3.63 lb/ft
5.40 kg/m		 0.092 gal/ft
1.14 L/m
NPS 1-1/2 · Sch 160 DN 40 160 — 1.900 in
48.26 mm		 0.281 in
7.14 mm		 1.338 in
33.99 mm		 1.406 in²
907 mm²		 4.86 lb/ft
7.23 kg/m		 0.073 gal/ft
0.91 L/m
NPS 2 · Sch 10 DN 50 10 — 2.375 in
60.32 mm		 0.109 in
2.77 mm		 2.157 in
54.79 mm		 3.654 in²
2358 mm²		 2.64 lb/ft
3.93 kg/m		 0.190 gal/ft
2.36 L/m
NPS 2 · Sch 40 DN 50 40 STD 2.375 in
60.32 mm		 0.154 in
3.91 mm		 2.067 in
52.50 mm		 3.356 in²
2165 mm²		 3.65 lb/ft
5.44 kg/m		 0.174 gal/ft
2.16 L/m
NPS 2 · Sch 80 DN 50 80 XS 2.375 in
60.32 mm		 0.218 in
5.54 mm		 1.939 in
49.25 mm		 2.953 in²
1905 mm²		 5.02 lb/ft
7.47 kg/m		 0.153 gal/ft
1.91 L/m
NPS 2 · Sch 160 DN 50 160 — 2.375 in
60.32 mm		 0.344 in
8.74 mm		 1.687 in
42.85 mm		 2.235 in²
1442 mm²		 7.46 lb/ft
11.10 kg/m		 0.116 gal/ft
1.44 L/m
NPS 2-1/2 · Sch 10 DN 65 10 — 2.875 in
73.02 mm		 0.120 in
3.05 mm		 2.635 in
66.93 mm		 5.453 in²
3518 mm²		 3.53 lb/ft
5.25 kg/m		 0.283 gal/ft
3.52 L/m
NPS 2-1/2 · Sch 40 DN 65 40 STD 2.875 in
73.02 mm		 0.203 in
5.16 mm		 2.469 in
62.71 mm		 4.788 in²
3089 mm²		 5.79 lb/ft
8.62 kg/m		 0.249 gal/ft
3.09 L/m
NPS 2-1/2 · Sch 80 DN 65 80 XS 2.875 in
73.02 mm		 0.276 in
7.01 mm		 2.323 in
59.00 mm		 4.238 in²
2734 mm²		 7.66 lb/ft
11.40 kg/m		 0.220 gal/ft
2.73 L/m
NPS 2-1/2 · Sch 160 DN 65 160 — 2.875 in
73.02 mm		 0.375 in
9.52 mm		 2.125 in
53.97 mm		 3.547 in²
2288 mm²		 10.01 lb/ft
14.90 kg/m		 0.184 gal/ft
2.29 L/m
NPS 3 · Sch 10 DN 80 10 — 3.500 in
88.90 mm		 0.120 in
3.05 mm		 3.260 in
82.80 mm		 8.347 in²
5385 mm²		 4.33 lb/ft
6.45 kg/m		 0.434 gal/ft
5.39 L/m
NPS 3 · Sch 40 DN 80 40 STD 3.500 in
88.90 mm		 0.216 in
5.49 mm		 3.068 in
77.93 mm		 7.393 in²
4769 mm²		 7.58 lb/ft
11.27 kg/m		 0.384 gal/ft
4.77 L/m
NPS 3 · Sch 80 DN 80 80 XS 3.500 in
88.90 mm		 0.300 in
7.62 mm		 2.900 in
73.66 mm		 6.605 in²
4261 mm²		 10.25 lb/ft
15.26 kg/m		 0.343 gal/ft
4.26 L/m
NPS 3 · Sch 160 DN 80 160 — 3.500 in
88.90 mm		 0.438 in
11.13 mm		 2.624 in
66.65 mm		 5.408 in²
3489 mm²		 14.32 lb/ft
21.32 kg/m		 0.281 gal/ft
3.49 L/m
NPS 3-1/2 · Sch 10 DN 90 10 — 4.000 in
101.60 mm		 0.120 in
3.05 mm		 3.760 in
95.50 mm		 11.104 in²
7164 mm²		 4.97 lb/ft
7.40 kg/m		 0.577 gal/ft
7.16 L/m
NPS 3-1/2 · Sch 40 DN 90 40 STD 4.000 in
101.60 mm		 0.226 in
5.74 mm		 3.548 in
90.12 mm		 9.887 in²
6379 mm²		 9.11 lb/ft
13.56 kg/m		 0.514 gal/ft
6.38 L/m
NPS 3-1/2 · Sch 80 DN 90 80 XS 4.000 in
101.60 mm		 0.318 in
8.08 mm		 3.364 in
85.45 mm		 8.888 in²
5734 mm²		 12.51 lb/ft
18.61 kg/m		 0.462 gal/ft
5.73 L/m
NPS 4 · Sch 10 DN 100 10 — 4.500 in
114.30 mm		 0.120 in
3.05 mm		 4.260 in
108.20 mm		 14.253 in²
9196 mm²		 5.61 lb/ft
8.35 kg/m		 0.740 gal/ft
9.20 L/m
NPS 4 · Sch 40 DN 100 40 STD 4.500 in
114.30 mm		 0.237 in
6.02 mm		 4.026 in
102.26 mm		 12.730 in²
8213 mm²		 10.79 lb/ft
16.06 kg/m		 0.661 gal/ft
8.21 L/m
NPS 4 · Sch 80 DN 100 80 XS 4.500 in
114.30 mm		 0.337 in
8.56 mm		 3.826 in
97.18 mm		 11.497 in²
7417 mm²		 14.98 lb/ft
22.30 kg/m		 0.597 gal/ft
7.42 L/m
NPS 4 · Sch 160 DN 100 160 — 4.500 in
114.30 mm		 0.531 in
13.49 mm		 3.438 in
87.33 mm		 9.283 in²
5989 mm²		 22.51 lb/ft
33.50 kg/m		 0.482 gal/ft
5.99 L/m
NPS 5 · Sch 10 DN 125 10 — 5.563 in
141.30 mm		 0.134 in
3.40 mm		 5.295 in
134.49 mm		 22.020 in²
14207 mm²		 7.77 lb/ft
11.56 kg/m		 1.144 gal/ft
14.21 L/m
NPS 5 · Sch 40 DN 125 40 STD 5.563 in
141.30 mm		 0.258 in
6.55 mm		 5.047 in
128.19 mm		 20.006 in²
12907 mm²		 14.62 lb/ft
21.75 kg/m		 1.039 gal/ft
12.91 L/m
NPS 5 · Sch 80 DN 125 80 XS 5.563 in
141.30 mm		 0.375 in
9.52 mm		 4.813 in
122.25 mm		 18.194 in²
11738 mm²		 20.78 lb/ft
30.92 kg/m		 0.945 gal/ft
11.74 L/m
NPS 5 · Sch 160 DN 125 160 — 5.563 in
141.30 mm		 0.625 in
15.88 mm		 4.313 in
109.55 mm		 14.610 in²
9426 mm²		 32.96 lb/ft
49.05 kg/m		 0.759 gal/ft
9.43 L/m
NPS 6 · Sch 10 DN 150 10 — 6.625 in
168.27 mm		 0.134 in
3.40 mm		 6.357 in
161.47 mm		 31.739 in²
20477 mm²		 9.29 lb/ft
13.82 kg/m		 1.649 gal/ft
20.48 L/m
NPS 6 · Sch 40 DN 150 40 STD 6.625 in
168.27 mm		 0.280 in
7.11 mm		 6.065 in
154.05 mm		 28.890 in²
18639 mm²		 18.97 lb/ft
28.24 kg/m		 1.501 gal/ft
18.64 L/m
NPS 6 · Sch 80 DN 150 80 XS 6.625 in
168.27 mm		 0.432 in
10.97 mm		 5.761 in
146.33 mm		 26.067 in²
16817 mm²		 28.57 lb/ft
42.52 kg/m		 1.354 gal/ft
16.82 L/m
NPS 6 · Sch 160 DN 150 160 — 6.625 in
168.27 mm		 0.719 in
18.26 mm		 5.187 in
131.75 mm		 21.131 in²
13633 mm²		 45.35 lb/ft
67.49 kg/m		 1.098 gal/ft
13.63 L/m
NPS 8 · Sch 10 DN 200 10 — 8.625 in
219.07 mm		 0.148 in
3.76 mm		 8.329 in
211.56 mm		 54.485 in²
35151 mm²		 13.40 lb/ft
19.94 kg/m		 2.830 gal/ft
35.15 L/m
NPS 8 · Sch 40 DN 200 40 STD 8.625 in
219.07 mm		 0.322 in
8.18 mm		 7.981 in
202.72 mm		 50.027 in²
32275 mm²		 28.55 lb/ft
42.49 kg/m		 2.599 gal/ft
32.28 L/m
NPS 8 · Sch 80 DN 200 80 XS 8.625 in
219.07 mm		 0.500 in
12.70 mm		 7.625 in
193.67 mm		 45.664 in²
29460 mm²		 43.39 lb/ft
64.57 kg/m		 2.372 gal/ft
29.46 L/m
NPS 8 · Sch 160 DN 200 160 — 8.625 in
219.07 mm		 0.906 in
23.01 mm		 6.813 in
173.05 mm		 36.456 in²
23520 mm²		 74.69 lb/ft
111.15 kg/m		 1.894 gal/ft
23.52 L/m
NPS 10 · Sch 10 DN 250 10 — 10.750 in
273.05 mm		 0.165 in
4.19 mm		 10.420 in
264.67 mm		 85.276 in²
55016 mm²		 18.65 lb/ft
27.76 kg/m		 4.430 gal/ft
55.02 L/m
NPS 10 · Sch 40 DN 250 40 STD 10.750 in
273.05 mm		 0.365 in
9.27 mm		 10.020 in
254.51 mm		 78.854 in²
50874 mm²		 40.48 lb/ft
60.25 kg/m		 4.096 gal/ft
50.87 L/m
NPS 10 · Sch 80 DN 250 80 XS 10.750 in
273.05 mm		 0.500 in
12.70 mm		 9.750 in
247.65 mm		 74.662 in²
48169 mm²		 54.74 lb/ft
81.46 kg/m		 3.879 gal/ft
48.17 L/m
NPS 10 · Sch 160 DN 250 160 — 10.750 in
273.05 mm		 1.125 in
28.57 mm		 8.500 in
215.90 mm		 56.745 in²
36610 mm²		 115.65 lb/ft
172.10 kg/m		 2.948 gal/ft
36.61 L/m
NPS 12 · Sch 10 DN 300 10 — 12.750 in
323.85 mm		 0.180 in
4.57 mm		 12.390 in
314.71 mm		 120.568 in²
77786 mm²		 24.17 lb/ft
35.96 kg/m		 6.263 gal/ft
77.79 L/m
NPS 12 · Sch 40 DN 300 40 — 12.750 in
323.85 mm		 0.406 in
10.31 mm		 11.938 in
303.23 mm		 111.932 in²
72214 mm²		 53.53 lb/ft
79.65 kg/m		 5.815 gal/ft
72.21 L/m
NPS 12 · Sch 80 DN 300 80 XS 12.750 in
323.85 mm		 0.500 in
12.70 mm		 11.750 in
298.45 mm		 108.434 in²
69957 mm²		 65.42 lb/ft
97.35 kg/m		 5.633 gal/ft
69.96 L/m
NPS 12 · Sch 160 DN 300 160 — 12.750 in
323.85 mm		 1.312 in
33.32 mm		 10.126 in
257.20 mm		 80.531 in²
51956 mm²		 160.27 lb/ft
238.51 kg/m		 4.183 gal/ft
51.96 L/m

ID = OD − 2t. Approximate plain-end weight uses W = 10.6802t(OD − t) lb/ft. Capacity assumes an empty circular bore and excludes lining, deposits, corrosion, and dimensional tolerance.

Advanced filters and table actions

Selected-row comparison

Compare Selected Pipe Values

The chart intentionally shows one compatible physical property at a time for a clear, truthful scale.

Select pipe rows in the table to compare values.

Pipe Schedule Chart Key Takeaways

  • Schedule controls nominal wall thickness, not OD. The OD stays fixed for a given NPS.
  • Higher schedules usually reduce bore and capacity. Compare ID or area—not just the schedule number.
  • STD and XS are aliases only where the wall matches. In this range, Schedule 40 matches STD through NPS 10, while NPS 12 Schedule 40 does not.
  • Calculated ID is nominal. Actual bore can change with tolerance, corrosion, lining, and deposits.

Scope and Important Limitations

This page covers a high-utility subset of ASME B36.10 wrought-steel dimensions: Schedules 10, 40, 80, and 160 from NPS 1/2 through NPS 12. It does not reproduce the complete copyrighted standard or cover every available schedule, size, stainless S-schedule, plastic SDR system, tubing series, pressure class, or project specification.

How to Read and Use the Pipe Schedule Chart

  1. Choose NPS or DN and the schedule required by the specification.
  2. Read OD and nominal wall thickness from the reference row.
  3. Use the calculated ID for preliminary flow area, volume, and velocity work.
  4. Use weight for estimating only; purchased pipe may vary with material and tolerance.
  5. Verify final selection against the purchased standard, governing piping code, and project specification.

Dimension and capacity relationships

ID = OD − 2t

Internal area = π(ID²)/4

Water capacity = internal area × 12/231 gal/ft

Worked Pipe Schedule Examples

NPS 2: Schedule 40 vs 80

Both pipes have a 2.375 in OD. Schedule 40 has a 0.154 in wall and 2.067 in ID; Schedule 80 has a 0.218 in wall and 1.939 in ID.

The Schedule 80 bore area is about 12% smaller, so the same flow produces higher velocity before other losses are considered.

NPS 6: Schedule 10 vs 160

Both pipes have a 6.625 in OD. Schedule 10 has a 0.134 in wall, while Schedule 160 has a 0.719 in wall.

The much thicker Schedule 160 wall sharply increases weight and reduces bore. That tradeoff must be evaluated with the design code and hydraulic requirements.

How Pipe Schedule Affects Design

Hydraulics

  • Inside diameter and flow area
  • Velocity and Reynolds number
  • Pressure loss and pump duty
  • Contained volume

Mechanical design

  • Code-required wall
  • Material allowable stress
  • Temperature and pressure
  • Corrosion and erosion allowance

Fabrication

  • Weld preparation and matching bore
  • Weight and support loads
  • Availability and cost
  • Owner and project specifications

Engineering Basis and Data Transparency

Common ASME B36.10 Schedule 10, 40, 80, and 160 dimensions with original derived calculations.

The controlling dimensional basis is ASME B36.10-2022. This page presents a limited educational subset and calculated values rather than a complete reproduction or downloadable transcription of the copyrighted standard.

Dataset and Review Details

Publisher
Turn2Engineering Editorial Team
Dimensional basis
ASME B36.10-2022
Included scope
NPS 1/2–12; Sch 10, 40, 80, 160
Source values
OD and nominal wall thickness
Calculated values
ID, area, weight, water capacity
Rights status
Limited reference; no bulk CSV
Generated
August 4, 2026
Design status
Educational and preliminary

Related Pipe Tools and References

Pipe Schedule Chart FAQ

Pipe schedule is a standardized wall-thickness designation. For a given NPS, a higher listed schedule generally means a thicker nominal wall and smaller calculated bore.

Carry the Calculated Bore into the Next Engineering Check

Use NPS and schedule to identify nominal dimensions, then use the calculated ID for preliminary volume, velocity, Reynolds number, and pressure-loss work. Confirm the final material and wall selection with the applicable purchased standard, piping code, and project specification.

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