Home & Construction calculator

Water Tank and Pipe Volume Calculator

Choose the container shape and enter only the dimensions needed for its internal volume.

Calculated privately on your device
No account. Formula and assumptions are shown below.

Calculator inputs

Tank and pipe volume details

Formula & disclaimer

Rectangular Volume = Length × Width × Height; Cylinder or Pipe Volume = π × (Diameter ÷ 2)² × Height or Length

View assumptions

Formula reviewCalcs at Hand Editorial TeamVerified 31 August 2026 · automated checks included

Three useful checks, kept deliberately short.

What this result includes

Gross internal capacity is 3.6 m³, or 3,600 litres.

A practical example

A 2 m × 1.5 m × 1.2 m rectangular tank: Multiply internal dimensions · Convert cubic metres to litres · Keep freeboard separate.

Common input mistake

Usable capacity may be lower because of freeboard, outlets, slopes or displaced equipment.

Rectangular Volume = Length × Width × Height; Cylinder or Pipe Volume = π × (Diameter ÷ 2)² × Height or Length

Use internal, not external, dimensions for liquid capacity.

Keep in mind: Confirm usable capacity, structural limits, overflow and water-quality requirements for installed systems.

Produced byCalcs at Hand Editorial Team

Last formula check31 August 2026

Review methodKnown examples + boundary cases