Construction & home

Rectangular Tank Capacity Calculator

Find internal tank capacity from inside dimensions.

Editable waste and coverage assumptionsCheck supplier specifications
Project planner
Project planner

Review dimensions, coverage and waste before ordering.

See the method

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Your material estimate

Your result

Let’s calculate.

Use the Calculate button to see your result.

Review the method below for assumptions and conventions.

How to use this tool

  1. Enter length, width, height.
  2. Select Calculate to view the result.
  3. Check the method and assumptions below before using the result.

Input reference and sample values

Use the units and choices shown for each field. Sample values are provided for practice, not as recommendations.

InputFormat and unitsSample
LengthNumeric value. Unit: m. Must be greater than zero.5
WidthNumeric value. Unit: m. Must be greater than zero.4
HeightNumeric value. Unit: m. Must be greater than zero.2.5

Result for these sample inputs

50000 L

Select Try the example in the form to load these values and calculate them again. This replaces the current form inputs. Compare the result with the method and worked explanation below.

The method, explained

Capacity in liters = length × width × height × 1000.

A WORKED EXAMPLE

Using length = 5 m, width = 4 m, height = 2.5 m, the result is 50000 L. Change these example inputs to match your task; use the method above to check each step.

What to keep in mind

Use internal dimensions. Does not account for freeboard or internal equipment. A material-quantity estimate, not a structural design or building-code check. Confirm site measurements, supplier coverage and waste before ordering.

Methodology maintained by ClarityKit. How these tools are built and checked.