Standard 8" nominal Schedule 40 PVC pipe has an exact inside diameter of 7.981 inches, holding 2.5986 US gallons (32.271 liters per meter) per linear foot. Part of our PVC Pipe Volume Hub and universal Pipe Volume Calculator suite.
Calculations are based on cylindrical formula \(V = \pi r^2 L\). Verify dimensions against manufacturer specs for code submittals.
Instant capacity and weight lookup table for common pipe lengths filled with water at 60°F (15.5°C).
| Pipe Length (Ft) | US Gallons | Liters | Cubic Feet (ft³) | Water Weight (lbs) | Dry Pipe (lbs) | Total Wet Weight |
|---|---|---|---|---|---|---|
| 1 ft | 2.599 gal | 9.84 L | 0.347 ft³ | 21.7 lbs | 5.4 lbs | 27.1 lbs |
| 2 ft | 5.197 gal | 19.67 L | 0.695 ft³ | 43.3 lbs | 10.8 lbs | 54.1 lbs |
| 5 ft | 12.993 gal | 49.18 L | 1.737 ft³ | 108.4 lbs | 26.9 lbs | 135.3 lbs |
| 10 ft | 25.986 gal | 98.36 L | 3.474 ft³ | 216.7 lbs | 53.9 lbs | 270.6 lbs |
| 20 ft | 51.972 gal | 196.72 L | 6.948 ft³ | 433.4 lbs | 107.8 lbs | 541.2 lbs |
| 50 ft | 129.93 gal | 491.8 L | 17.37 ft³ | 1083.6 lbs | 269.5 lbs | 1353.1 lbs |
| 100 ft | 259.86 gal | 983.6 L | 34.74 ft³ | 2167.2 lbs | 539.0 lbs | 2706.2 lbs |
| 250 ft | 649.65 gal | 2459.1 L | 86.85 ft³ | 5418.0 lbs | 1347.5 lbs | 6765.5 lbs |
| 500 ft | 1299.30 gal | 4918.1 L | 173.70 ft³ | 10836.0 lbs | 2695.0 lbs | 13531.0 lbs |
Step-by-step mathematical demonstration using cylinder geometric principles and ASTM D1785 specifications.
Nominal size is 8", but true inner diameter is 7.981 inches.
r = ID / 2 = 7.981 / 2 = 3.9905" Compute circular cross-section area using $A = \pi \times r^2$:
A = \pi \times (3.9905)^2 = 50.0270 sq in Multiply cross-sectional area by 12 inches (1 linear foot):
V_linear = 50.0270 \times 12 = 600.324 cu in/ft Divide cubic inches by 231 (cubic inches in 1 US Gallon):
Gallons/Ft = 600.324 / 231 = 2.5986 Gal/Ft Physical dimensions, pressure thresholds, and hydraulic velocity limits.
Primary Use Case: Large municipal irrigation trunk lines, industrial wastewater disposal, and site development infrastructure drainage.
Explore adjacent diameter calculations or compare with different pressure schedules.
Compare fluid holding capacity, wall thickness, and weight against other standard piping materials for 8" nominal diameter:
Frequently asked engineering and volumetric capacity questions for 8" PVC.
A 100-foot run of 8-inch Schedule 40 PVC pipe holds 259.86 US Gallons (983.7 Liters) of water.