Pipefitter's Pocket Card — PVC Dimensions, Pressure Ratings & Offset Multipliers
One-page pipefitter's card: PVC Schedule 40/80 dimensions, pressure ratings with temperature derating, and rolling offset travel multipliers.
Updated August 22, 2026
The PVC and fit-up numbers a pipefitter reaches for between the spool sheet and the saw, on one card: ASTM D1785 Schedule 40 and 80 PVC outside diameters with walls and computed bores for the common trade sizes, the published D1785 pressure ratings for water at 73 °F, the temperature derating factors that shrink those ratings as the line warms, and the travel multipliers that turn a measured offset into a center-to-center length at each standard fitting angle.
Every cell is generated from the constants behind the pipe schedules and PVC pressure rating charts and the pipe offset calculator — bores are computed as OD − 2 × wall, and each multiplier is the cosecant of the exported preset angle, never a looked-up constant. Print it for the gang box; the steel schedule table lives on the plumber card, and the linked pages carry the 6″ PVC row, threading derates, and rolling offset math this card trims.
Pipefitter's Pocket Card — PVC Dimensions, Pressure Ratings & Offset Multipliers — updated August 22, 2026
PVC pipe Sch 40/80 (ASTM D1785)
| Size | OD (in) | S40 wall | S40 ID | S80 wall | S80 ID |
|---|---|---|---|---|---|
| 1/2" | 0.840 | 0.109 | 0.622 | 0.147 | 0.546 |
| 3/4" | 1.050 | 0.113 | 0.824 | 0.154 | 0.742 |
| 1" | 1.315 | 0.133 | 1.049 | 0.179 | 0.957 |
| 1-1/4" | 1.660 | 0.140 | 1.380 | 0.191 | 1.278 |
| 1-1/2" | 1.900 | 0.145 | 1.610 | 0.200 | 1.500 |
| 2" | 2.375 | 0.154 | 2.067 | 0.218 | 1.939 |
| 2-1/2" | 2.875 | 0.203 | 2.469 | 0.276 | 2.323 |
| 3" | 3.500 | 0.216 | 3.068 | 0.300 | 2.900 |
| 4" | 4.500 | 0.237 | 4.026 | 0.337 | 3.826 |
Sizes 1/2″–4″; ID computed as OD − 2 × minimum wall (plus-only tolerance, so ID is the maximum bore). 6″ row and copper/steel tables: pipe schedules chart.
PVC pressure ratings, psi (ASTM D1785)
| Size | Sch 40 | Sch 80 |
|---|---|---|
| 1/2" | 600 | 850 |
| 3/4" | 480 | 690 |
| 1" | 450 | 630 |
| 1-1/4" | 370 | 520 |
| 1-1/2" | 330 | 470 |
| 2" | 280 | 400 |
| 2-1/2" | 300 | 420 |
| 3" | 260 | 370 |
| 4" | 220 | 320 |
| 6" | 180 | 280 |
Water at 73 °F, non-shock, unthreaded PVC 1120 (hydrostatic design stress 2,000 psi). Threaded Sch 80 is rated at 50% of these values; do not thread Sch 40.
Temperature derating factors
| Temp (°F) | Factor |
|---|---|
| 73 | 1.00 |
| 80 | 0.88 |
| 90 | 0.75 |
| 100 | 0.62 |
| 110 | 0.51 |
| 120 | 0.40 |
| 130 | 0.31 |
| 140 | 0.22 |
Max working pressure = 73 °F rating × factor. 140 °F is the PVC service limit; no threaded joints above 110 °F.
Offset travel multipliers (fitting angles)
| Fitting angle | Travel = offset × |
|---|---|
| 11.25° | 5.1258 |
| 22.5° | 2.6131 |
| 30° | 2.0000 |
| 45° | 1.4142 |
| 60° | 1.1547 |
Travel = offset ÷ sin(angle), center to center; subtract two fitting take-outs for the cut length. Rolling offsets (true offset = √(rise² + roll²)): pipe offset calculator.
Sources
- ASTM D1785 PVC pipe dimensions (Tables 1/2) and Appendix X1 pressure ratings; ID = OD − 2 × wall
- Manufacturer temperature derating factors (Harvel / U.S. Plastic), applied industry-wide
- W. V. Graves, The Pipe Fitter's and Pipe Welder's Handbook — travel = offset ÷ sin(angle) at the standard fitting angles
Try the Calculators
Pipefitter's Pocket Card — PVC Dimensions, Pressure Ratings & Offset Multipliers — reuven.tools/cheat-sheets/pipefitter-card — verified against: ASTM D1785 PVC pipe dimensions (Tables 1/2) and Appendix X1 pressure ratings; ID = OD − 2 × wall; Manufacturer temperature derating factors (Harvel / U.S. Plastic), applied industry-wide; W. V. Graves, The Pipe Fitter's and Pipe Welder's Handbook — travel = offset ÷ sin(angle) at the standard fitting angles