Determine the exact holding capacity of your water tank with our Water Tank Calculator. Whether you have a vertical cylinder, a horizontal capsule, or a rectangular cistern, our tool calculates the total volume and water weight to help you plan for storage and structural support.
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Water Tank Volume Calculator
Calculate the capacity and water weight for various tank shapes.
Tank Dimensions
About This Calculator
This calculator determines the liquid capacity of storage tanks in gallons, liters, and cubic feet. It supports common tank shapes including vertical cylinders, horizontal cylinders (capsules), and rectangular/square tanks.
Note: The weight calculation assumes the tank is filled with water (density ≈ 8.34 lbs/gal or 1 kg/L). For other liquids (like fuel or oil), the weight will vary based on specific gravity.
Calculate Water Tank Capacity
Calculate the volume and water weight of vertical, horizontal, and rectangular tanks. Accurate results in gallons and liters.
1
Select Shape
Choose your tank shape (Cylinder, Rectangle, etc.).
2
Enter Dimensions
Input the height, diameter, length, or width.
3
Get Results
View the total capacity in gallons/liters and the weight.
Key Features
Multi-Shape Support
Calculate for Vertical Cylinders, Horizontal Capsules, and Rectangular tanks.
Capacity Conversion
Instantly see results in Gallons, Liters, and Cubic Feet.
Weight Estimation
Get the total weight of the water when the tank is full.
Frequently Asked Questions
For a vertical cylinder, use V = π × r² × h. Our calculator handles this automatically.
A US gallon of water weighs approximately 8.34 lbs (3.785 kg).
Yes, the volume calculation is accurate for any liquid, but the weight estimate is specific to water.
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