How to Calculate Tank Volume
Whether you're sizing a water storage tank, fuel tank, or industrial container, knowing exact volume is critical for purchasing, compliance, and logistics planning.
Rectangular Tank Formula
Volume = Length × Width × Height
Convert to gallons by dividing cubic inches by 231, or convert cubic centimeters to liters by dividing by 1,000.
Cylindrical Tank Formula
Volume = π × (Diameter ÷ 2)² × Height
This formula works for both vertical and horizontal cylinders — the total capacity is the same regardless of orientation.
Why HDPE Tanks Are the Industry Standard
High-Density Polyethylene (HDPE) tanks have become the preferred choice for water storage, chemical storage, and food-grade applications because they're:
- FDA-compliant for potable water (21 CFR 177.1520)
- UV-stabilized for outdoor use in extreme climates
- Corrosion-proof — unlike steel tanks that rust
- Lightweight — 40-60% less weight than steel equivalents
- Seamless construction via rotational molding