engineering Calculator

Water Tank Capacity & Volume Calculator

Calculate water storage capacity, total gallons/liters, and water weight for cylindrical, rectangular, and spherical tanks.

Audited by UniqCalc Methodology Team • Formula Checked • Free & No Registration Required

Verified Mathematical Model & Formulation

Cylinder Volume = π × (Diameter/2)^2 × Height
Rectangular Volume = Length × Width × Height
1 m³ = 1,000 Liters = 264.172 US Gallons
Water Weight = 1 kg/Liter (8.34 lbs/Gallon)

Computes geometric volume from boundary dimensions, converts to liquid metric/US imperial units, and calculates structural live load water weight.

Configurable Parameters & Standard Units

  • Tank Geometry (1=Cylinder, 2=Rectangular): (Default: 1 count)
  • Diameter (Cylinder) or Length (Box) in Meters: (Default: 1.8 m)
  • Width in Meters [Rectangular Box only]: (Default: 1.5 m)
  • Height in Meters: (Default: 2.2 m)

Standard Worked Example & Practical Verification

Scenario: A vertical rooftop poly tank with diameter 1.6 meters and height 2.0 meters.

Calculated Solution
4,021 Liters (1,062 US Gallons, 4.02 Tons Water Weight)

Practical Takeaway: Structural support beams under the roof must be engineered to support the 4-ton live load when full.

Frequently Asked Questions

How much does 1,000 liters of water weigh?

1,000 liters of fresh water weighs exactly 1,000 kilograms (1 metric ton) or approximately 2,205 pounds.

How much water should a household store?

Standard engineering guidelines recommend 150 to 250 liters of water storage per occupant per day for domestic use (drinking, hygiene, cooking).