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Water Tank Capacity Calculator

Litres for rectangular or circular tanks.

Enter details

How to use

  1. Fill in: Tank shape, Length (m, rect only), Width (m, rect only), Diameter (m, circular only) and Height / depth (m). Fields with defaults or marked optional can stay as shown.
  2. Tap Calculate Capacity.
  3. Read the result - you can print or save it as PDF.

Worked example

With Tank shape = Rectangular, Length = 2, Width = 1.5, Diameter = 1.5, Height / depth = 1.5:

TANK CAPACITY4,500 litres
  • Capacity: 4,500 L
  • Volume: 4.5 m³
  • Kilolitres: 4.5 kL
  • Approx. family days*: 6.7 days
*At ~135 litres per person per day for a family of 5. Fill level and walls reduce usable capacity.