Pipe Volume Calculator

Calculate the volume of water held inside a pipe from its inside diameter and length.

Inside Diameter2 inLength10 ft
ID = Inside Diameter
L = Length
r = Radius (ID / 2)
V = Volume
VOLUME
— gal
(US Gallons)

Usage Tip

Enter the inside diameter of the pipe and the length to find the exact volume of water the pipe can hold.

THE MATH
V = π × r2 × L
Where: r = ID2 (radius)  •  L = length  •  π = 3.14159265
• Volume is calculated in cubic units
• 1 gallon = 231 cubic inches
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The calculators and tools on Formula Factory are provided for general guidance and informational purposes only. Results are estimates based on standard formulas and the values you enter — they do not constitute professional engineering, electrical, or architectural advice. Always verify calculations with a qualified professional before making decisions for any safety-critical, code-compliance, or commercial application. Formula Factory makes no representations or warranties as to the accuracy or completeness of any result, and accepts no liability for errors, omissions, or any outcomes arising from reliance on this information.