Water Tank Capacity Calculator
Estimate tank capacity by shape and dimensions. Results are shown in liters, cubic meters, and US/UK gallons.
How to Calculate Tank Volume
Water tank capacity is calculated by finding the tank volume based on its shape, then converting that volume into liters or gallons. This tool uses standard geometry formulas and applies an optional fill percentage to estimate filled capacity.
Tank Volume Formulas Explained
- Rectangular: length × width × height
- Vertical cylinder: π × (d/2)² × height
- Horizontal cylinder: π × (d/2)² × length (full tank)
Differences Between Tank Shapes
Rectangular tanks are common for underground and concrete tanks. Cylindrical tanks are common for overhead plastic tanks. Horizontal tanks are often used for transport and storage where height is limited.
FAQ
iHow do I calculate water tank capacity?
Choose the tank shape, enter dimensions, calculate volume in cubic meters, then convert to liters or gallons.
How many liters are in 1 cubic meter?
1 cubic meter (1 m³) equals 1000 liters.
What is the formula for cylindrical tank volume?
Use volume = π × (diameter/2)² × height.
How do I calculate partial tank capacity?
Use fill percentage for a simple estimate. For horizontal tanks, fill depth can be used to compute a more accurate partial volume.
How accurate is this calculator?
It provides a practical estimate using standard formulas. Real capacity can vary due to internal shape, thickness, and manufacturing tolerances.
Disclaimer
This calculator provides an estimate only. Actual usable capacity may differ due to internal tank geometry, fittings, and tolerances.