Pipe Volume & Capacity
Construction & DIYCalculate internal liquid volume, fluid capacity in gallons or liters, and filled water weight for pipes, tubing, and cylindrical conduits from internal diameter and length.
Also 123.56 liters · water weight 272.4 lbs
About this calculator
Plumbers, HVAC technicians, and hydronic heating engineers need to calculate the exact volume of water or refrigerant contained inside a piping network to properly size expansion tanks, glycol mixtures, and drainage systems.
This tool calculates internal cylindrical volume in cubic inches, cubic feet, gallons, and liters, and computes the total added weight of water when the pipe is fully flooded.
How It Works & Formula
Internal Radius r = Inner Diameter / 2. Volume = π × r² × Length. Liquid capacity converts cubic volume to gallons (1 cu ft ≈ 7.48052 gal) or liters (1 m³ = 1000 L). Water weight multiplies volume by water density (8.34 lbs/gal or 1 kg/L).
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