Standard 3/4" nominal Type K copper tubing has an ASTM B88 calibrated inside diameter of 0.745 inches, holding 0.0227 US gallons (0.282 liters per meter) per linear foot. Part of our Copper 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 copper pipe runs filled with potable water at 60°F.
| Pipe Length (Ft) | US Gallons | Liters | Cubic Feet (ft³) | Water Weight (lbs) | Dry Copper (lbs) | Total Wet Weight |
|---|---|---|---|---|---|---|
| 1 ft | 0.023 gal | 0.09 L | 0.003 ft³ | 0.2 lbs | 0.6 lbs | 0.8 lbs |
| 2 ft | 0.045 gal | 0.17 L | 0.006 ft³ | 0.4 lbs | 1.3 lbs | 1.7 lbs |
| 5 ft | 0.114 gal | 0.43 L | 0.015 ft³ | 0.9 lbs | 3.2 lbs | 4.1 lbs |
| 10 ft | 0.227 gal | 0.86 L | 0.030 ft³ | 1.9 lbs | 6.4 lbs | 8.3 lbs |
| 20 ft | 0.454 gal | 1.72 L | 0.061 ft³ | 3.8 lbs | 12.8 lbs | 16.6 lbs |
| 50 ft | 1.14 gal | 4.3 L | 0.15 ft³ | 9.4 lbs | 32.0 lbs | 41.5 lbs |
| 100 ft | 2.27 gal | 8.6 L | 0.30 ft³ | 18.9 lbs | 64.1 lbs | 83.0 lbs |
| 250 ft | 5.68 gal | 21.5 L | 0.76 ft³ | 47.3 lbs | 160.3 lbs | 207.5 lbs |
| 500 ft | 11.35 gal | 43.0 L | 1.52 ft³ | 94.5 lbs | 320.5 lbs | 415.0 lbs |
Step-by-step mathematical demonstration using cylinder geometric principles and ASTM B88 specifications.
Nominal size is 3/4", but true inner diameter is 0.745 inches.
r = ID / 2 = 0.745 / 2 = 0.3725" Compute circular cross-section area using $A = \pi \times r^2$:
A = \pi \times (0.3725)^2 = 0.4359 sq in Multiply cross-sectional area by 12 inches (1 linear foot):
V_linear = 0.4359 \times 12 = 5.231 cu in/ft Divide cubic inches by 231 (cubic inches in 1 US Gallon):
Gallons/Ft = 5.231 / 231 = 0.0227 Gal/Ft Physical dimensions, pressure thresholds, and hydraulic velocity limits.
Primary Use Case: Standard for underground municipal meter-to-house water supply lines where extreme soil stress and durability are required.
Explore adjacent diameter calculations or compare with different copper types (Type K vs Type L).
Compare fluid holding capacity, wall thickness, and weight against other standard piping materials for 3/4" nominal diameter:
Frequently asked engineering and volumetric capacity questions for 3/4" copper tubing.
A 100-foot run of 3/4 inch Type K copper holds 2.27 US Gallons (8.59 Liters) of water.