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ASTM B88 / NSF 61 Type L Copper True ID: 0.785" (19.94 mm) 580 PSI Max

3/4" Type L Copper Pipe Volume & Capacity Calculator

Standard 3/4" nominal Type L copper tubing has an ASTM B88 calibrated inside diameter of 0.785 inches, holding 0.0251 US gallons (0.312 liters per meter) per linear foot. Part of our Copper Pipe Volume Hub and universal Pipe Volume Calculator suite.

Presets:
Calculated Result

Total Liquid Capacity

Internal Holding Volume
0.5028 US gallons
≈ 1.903 litres

Unit Conversions

US Gallons 0.5028 gal
Litres 1.903 L
Cubic Feet (ft³) 0.0672 ft³
Cubic Inches (in³) 116.16 in³
Imperial Gallons 0.4187 UK gal
Cubic Meters (m³) 0.0019 m³
Filled Water Weight 4.2 lbs (1.9 kg)
Linear Capacity Rate 0.0251 gal/ft

Calculations are based on cylindrical formula \(V = \pi r^2 L\). Verify dimensions against manufacturer specs for code submittals.

Pre-Calculated Capacity Table

3/4" Type L Copper Quick Reference Sizing Chart

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 0.025 gal 0.10 L 0.003 ft³ 0.2 lbs 0.5 lbs 0.7 lbs
2 ft 0.050 gal 0.19 L 0.007 ft³ 0.4 lbs 0.9 lbs 1.3 lbs
5 ft 0.126 gal 0.48 L 0.017 ft³ 1.0 lbs 2.3 lbs 3.3 lbs
10 ft 0.251 gal 0.95 L 0.034 ft³ 2.1 lbs 4.5 lbs 6.6 lbs
20 ft 0.502 gal 1.90 L 0.067 ft³ 4.2 lbs 9.1 lbs 13.3 lbs
50 ft 1.26 gal 4.8 L 0.17 ft³ 10.4 lbs 22.8 lbs 33.2 lbs
100 ft 2.51 gal 9.5 L 0.34 ft³ 20.9 lbs 45.5 lbs 66.4 lbs
250 ft 6.28 gal 23.8 L 0.84 ft³ 52.3 lbs 113.8 lbs 166.0 lbs
500 ft 12.55 gal 47.5 L 1.68 ft³ 104.5 lbs 227.5 lbs 332.0 lbs
Engineering Formula

How to Calculate 3/4" Copper Pipe Volume Manually

Step-by-step mathematical demonstration using cylinder geometric principles and ASTM B88 specifications.

Step 1

Determine the Internal Radius (r)

Nominal size is 3/4", but true inner diameter is 0.785 inches.

r = ID / 2 = 0.785 / 2 = 0.3925"
Step 2

Calculate Cross-Sectional Area (A)

Compute circular cross-section area using $A = \pi \times r^2$:

A = \pi \times (0.3925)^2 = 0.4840 sq in
Step 3

Calculate Linear Foot Volume

Multiply cross-sectional area by 12 inches (1 linear foot):

V_linear = 0.4840 \times 12 = 5.808 cu in/ft
Step 4

Convert to US Gallons & Liters

Divide cubic inches by 231 (cubic inches in 1 US Gallon):

Gallons/Ft = 5.808 / 231 = 0.0251 Gal/Ft
Technical Specifications

3/4" Type L Copper Engineering Profile

Physical dimensions, pressure thresholds, and hydraulic velocity limits.

Outside Diameter (OD)
0.875 inches
22.2 mm
Inside Diameter (ID)
0.785 inches
19.94 mm
Wall Thickness
0.045 inches
ASTM B88 Standard
Max Recommended Flow
7.5 GPM
At 5 ft/s velocity
Rated Working Pressure
580 PSI
Solder joint limit
Max Temperature Limit
400°F
204°C continuous

Common Plumbing & Heating Applications for 3/4" Type L Copper:

  • Main residential cold & hot water trunks
  • Water heater inlet & outlet lines
  • Hydronic heating zone manifolds

Primary Use Case: Standard distribution size for whole-house main plumbing trunks, feeding multiple fixtures simultaneously without pressure drop.

Size Navigation

Compare Other Copper Pipe Sizes

Explore adjacent diameter calculations or compare with different copper types (Type K vs Type L).

← Previous Size 1/2" Type L Copper Overview Directory All Copper Pipe Sizes (Type K & L) Next Size → 1" Type L Copper Compare Alternative Type ↔ 3/4" Type K Copper
Cross-Material Comparison

Compare 3/4" Pipe in Other Materials

Compare fluid holding capacity, wall thickness, and weight against other standard piping materials for 3/4" nominal diameter:

PVC Schedule 40 (ASTM D1785) 3/4" PVC Sch 40 PEX Potable Tubing (ASTM F876) PEX CTS Tubing Flow & Velocity (5-8 ft/s) 3/4" Copper Flow Rate Domestic Hot Water Water Heater Sizing Tool
Expert FAQ Guide

3/4" Type L Copper FAQs

Frequently asked engineering and volumetric capacity questions for 3/4" copper tubing.

2 Questions Answered
Q1 How many gallons in a 50 ft run of 3/4" Type L copper pipe?

A 50-foot run of 3/4 inch Type L copper pipe holds approximately 1.26 US Gallons (4.75 Liters) of water.

Q2 What is the inside diameter of 3/4" Type L copper pipe?

The inner diameter is 0.785 inches (19.94 mm), outer diameter is 0.875 inches (7/8"), and wall thickness is 0.045 inches.

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