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ASTM D1785 / ASTM D2665 Schedule 40 True ID: 3.068" (77.93 mm) 260 PSI @ 73°F

3" Schedule 40 PVC Pipe Volume & Capacity Calculator

Standard 3" nominal Schedule 40 PVC pipe has an exact inside diameter of 3.068 inches, holding 0.384 US gallons (4.769 liters per meter) per linear foot. Part of our PVC Pipe Volume Hub and universal Pipe Volume Calculator suite.

Presets:
Calculated Result

Total Liquid Capacity

Internal Holding Volume
7.681 US gallons
≈ 29.075 litres

Unit Conversions

US Gallons 7.681 gal
Litres 29.075 L
Cubic Feet (ft³) 1.027 ft³
Cubic Inches (in³) 1,774.24 in³
Imperial Gallons 6.396 UK gal
Cubic Meters (m³) 0.0291 m³
Filled Water Weight 64.1 lbs (29.1 kg)
Linear Capacity Rate 0.3840 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" Schedule 40 PVC Quick Reference Sizing Chart

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 0.384 gal 1.45 L 0.051 ft³ 3.2 lbs 1.4 lbs 4.6 lbs
2 ft 0.768 gal 2.91 L 0.103 ft³ 6.4 lbs 2.8 lbs 9.2 lbs
5 ft 1.920 gal 7.27 L 0.257 ft³ 16.0 lbs 7.0 lbs 23.1 lbs
10 ft 3.840 gal 14.54 L 0.513 ft³ 32.0 lbs 14.1 lbs 46.1 lbs
20 ft 7.680 gal 29.07 L 1.026 ft³ 64.1 lbs 28.2 lbs 92.3 lbs
50 ft 19.20 gal 72.7 L 2.56 ft³ 160.2 lbs 70.5 lbs 230.7 lbs
100 ft 38.40 gal 145.4 L 5.13 ft³ 320.3 lbs 141.0 lbs 461.3 lbs
250 ft 96.00 gal 363.4 L 12.82 ft³ 800.8 lbs 352.5 lbs 1153.3 lbs
500 ft 192.00 gal 726.8 L 25.65 ft³ 1601.5 lbs 705.0 lbs 2306.5 lbs
Engineering Formula

How to Calculate 3" PVC Pipe Volume Manually

Step-by-step mathematical demonstration using cylinder geometric principles and ASTM D1785 specifications.

Step 1

Determine the Internal Radius (r)

Nominal size is 3", but true inner diameter is 3.068 inches.

r = ID / 2 = 3.068 / 2 = 1.5340"
Step 2

Calculate Cross-Sectional Area (A)

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

A = \pi \times (1.5340)^2 = 7.3927 sq in
Step 3

Calculate Linear Foot Volume

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

V_linear = 7.3927 \times 12 = 88.712 cu in/ft
Step 4

Convert to US Gallons & Liters

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

Gallons/Ft = 88.712 / 231 = 0.384 Gal/Ft
Technical Specifications

3" Schedule 40 PVC Engineering Profile

Physical dimensions, pressure thresholds, and hydraulic velocity limits.

Outside Diameter (OD)
3.5 inches
88.9 mm
Inside Diameter (ID)
3.068 inches
77.93 mm
Wall Thickness
0.216 inches
ASTM D1785 Tolerance
Max Recommended Flow
115.2 GPM
At 5 ft/s velocity
Working Pressure
260 PSI
At 73°F (23°C)
Max Temperature Limit
140°F
60°C continuous

Common Plumbing & Piping Applications for 3" Schedule 40:

  • Toilet water closet waste stacks
  • Main residential soil stacks
  • Large commercial condensate mains

Primary Use Case: Standard plumbing code requirement for water closet (toilet) discharge drainage stacks and primary residential roof vents.

Size Navigation

Compare Other PVC Pipe Sizes

Explore adjacent diameter calculations or compare with different pressure schedules.

← Previous Size 2" Schedule 40 PVC Overview Directory All PVC Pipe Sizes (Sch 40 & 80) Next Size → 4" Schedule 40 PVC Compare Alternative Schedule ↔ 3" Schedule 80 PVC
Cross-Material Comparison

Compare 3" Pipe in Other Materials

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

Copper Tubing (ASTM B88) 3" Copper (Type K/L/M) Cast Iron DWV (ASTM A888) Cast Iron Soil Pipe Schedule 40 Steel (ASTM A53) Steel Schedule 40 Pipe Fluid Velocity & GPM 3" Flow Rate Calculator
Expert FAQ Guide

3" Schedule 40 PVC FAQs

Frequently asked engineering and volumetric capacity questions for 3" PVC.

2 Questions Answered
Q1 How many gallons does a 3 inch PVC pipe hold per foot?

A 3" Schedule 40 PVC pipe holds 0.3840 US Gallons (1.453 Liters) per linear foot.

Q2 How many gallons in a 10-foot section of 3" PVC pipe?

A 10-foot section holds 3.84 US Gallons (14.53 Liters) of water, weighing approximately 32.0 lbs in fluid alone.

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