Frequently Asked Questions
How many gallons in 50 feet of 4-inch pipe?
ID = 4 in, radius = 2 in = 0.1667 ft. Volume = pi x 0.1667^2 x 50 = 4.36 cu ft x 7.481 = 32.6 gallons.
What is the volume of a 6-inch pipe per foot?
pi x (3/12)^2 x 1 = 0.1963 cu ft/ft = 1.47 gallons per foot of 6-inch pipe.
How heavy is water in 100 ft of 2-inch pipe?
Volume = pi x (1/12)^2 x 100 = 2.18 cu ft = 16.3 gallons. Water weight = 16.3 x 8.34 = 136 lbs.
What is the formula for pipe volume?
Volume = pi x (inner_diameter_in / 24)^2 x length_ft in cubic feet. Multiply by 7.481 for gallons.
What is the difference between nominal and actual pipe diameter?
Nominal pipe size (NPS) is a conventional label, not the actual inner diameter. A 2-in Schedule 40 pipe has an inner diameter of 2.067 in, not exactly 2 in. For precise calculations use the actual inner diameter from a pipe specification table.
Can I use this for rectangular ducts?
No. This calculator is for round pipes only. For rectangular ducts multiply width x height (in feet) x length to get cubic feet, then multiply by 7.481 for gallons if needed.
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Estimates for informational purposes only.
Important Disclaimer: Estimates for informational purposes only.
This calculator provides estimates for informational purposes only. Results are based on assumptions and may not reflect actual outcomes. Consult qualified professionals in relevant fields before making important decisions based on these results.