Water Tank Volume Calculator – Calculate Tank Capacity in Liters & Gallons
Quickly find out how much water your tank can hold with our Water Tank Volume Calculator. Supports cylindrical, rectangular, and other tank shapes. Get results in liters, gallons, or cubic meters instantly.
Tank Volume Results
Enter values and click Calculate to see results
Volume Formulas
Conversion factors:
1 m³ = 1,000 liters = 264.17 gallons = 35.31 cubic feet
How to Calculate Water Tank Volume
Select Tank Shape
Choose cylindrical, rectangular, spherical, or conical tank shape.
Enter Dimensions
Input tank measurements (diameter/length, width, height) in your preferred unit.
Get Capacity Results
See tank volume in liters, gallons, cubic meters, and cubic feet.
Key Features of This Tank Calculator
**Multiple Tank Shapes**
Support for cylindrical, rectangular, spherical, and conical tank geometries.
**Flexible Units**
Enter dimensions in meters, feet, inches, or cm. Output in liters or gallons.
**Complete Conversions**
Results shown in all common volume units for easy reference.
**Accurate Formulas**
Uses precise geometric formulas for each tank shape calculation.
Frequently Asked Questions
How do I calculate tank volume?
For cylindrical tanks: V = π × r² × h. For rectangular: V = l × w × h. For spherical: V = (4/3) × π × r³. Measure internal dimensions for accurate capacity.
How many gallons is my water tank?
Calculate volume in cubic feet, then multiply by 7.48 to get gallons. Or calculate in cubic meters and multiply by 264.17 for gallons.
What size water tank do I need?
A typical household needs 50-100 gallons per person. A family of 4 might need a 400-500 gallon tank for backup water storage.
How do I measure a round tank?
Measure the diameter (widest point across the circle) and divide by 2 for radius. Measure height from bottom to top. Use these in the cylinder formula.
Should I measure inside or outside dimensions?
Always measure inside dimensions for capacity calculations. Tank walls have thickness that reduces internal volume.
Other Free Tools
Water Flow Rate Calculator
Water Flow Rate Calculator – Calculate Flow Rate in Pipes
Pipe Water Tank Pressure Calculator
Pipe Water Pressure Calculator – Calculate Static Pressure from Water Tank Height
Water Requirement Calculator
Water Intake Calculator – How Much Water Should You Drink Per Day?
Aquarium Filtration Calculator
Aquarium Filtration Calculator – Find the Right Filter Size for Your Fish Tank
Aquarium Volume Calculator
Aquarium Volume Calculator – Calculate Fish Tank Water Capacity
Manning Equation Calculator
Manning Equation Calculator – Open Channel Flow