Standard 1/2" nominal Type K copper tubing has an ASTM B88 calibrated inside diameter of 0.527 inches, holding 0.0113 US gallons (0.14 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 | 0.011 gal | 0.04 L | 0.002 ft³ | 0.1 lbs | 0.3 lbs | 0.4 lbs |
| 2 ft | 0.023 gal | 0.09 L | 0.003 ft³ | 0.2 lbs | 0.7 lbs | 0.9 lbs |
| 5 ft | 0.056 gal | 0.21 L | 0.008 ft³ | 0.5 lbs | 1.7 lbs | 2.2 lbs |
| 10 ft | 0.113 gal | 0.43 L | 0.015 ft³ | 0.9 lbs | 3.4 lbs | 4.4 lbs |
| 20 ft | 0.226 gal | 0.85 L | 0.030 ft³ | 1.9 lbs | 6.9 lbs | 8.8 lbs |
| 50 ft | 0.56 gal | 2.1 L | 0.08 ft³ | 4.7 lbs | 17.2 lbs | 21.9 lbs |
| 100 ft | 1.13 gal | 4.3 L | 0.15 ft³ | 9.4 lbs | 34.4 lbs | 43.8 lbs |
| 250 ft | 2.82 gal | 10.7 L | 0.38 ft³ | 23.5 lbs | 86.0 lbs | 109.5 lbs |
| 500 ft | 5.65 gal | 21.3 L | 0.76 ft³ | 47.0 lbs | 172.0 lbs | 219.0 lbs |
Step-by-step mathematical demonstration using cylinder geometric principles and ASTM B88 specifications.
Nominal size is 1/2", but true inner diameter is 0.527 inches.
r = ID / 2 = 0.527 / 2 = 0.2635" Compute circular cross-section area using $A = \pi \times r^2$:
A = \pi \times (0.2635)^2 = 0.2181 sq in Multiply cross-sectional area by 12 inches (1 linear foot):
V_linear = 0.2181 \times 12 = 2.618 cu in/ft Divide cubic inches by 231 (cubic inches in 1 US Gallon):
Gallons/Ft = 2.618 / 231 = 0.0113 Gal/Ft Physical dimensions, pressure thresholds, and hydraulic velocity limits.
Primary Use Case: Mandated by plumbing codes for direct burial underground municipal water service connections and harsh under-slab piping.
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 1/2" nominal diameter:
Frequently asked engineering and volumetric capacity questions for 1/2" copper tubing.
Type K has a thicker wall (0.049" vs 0.040") for underground burial durability, making the inside diameter 0.527" (holding 0.0113 gal/ft) compared to Type L (0.545" ID, 0.0121 gal/ft).