AALASOS-ENGR
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Water Tank Capacity

Estimate required storage capacity.

Project & Input Data

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no.

Your project criterion: enter the value from your governing code, specification or approved supplier data. No standard value is assumed.

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Engineering Assumptions

Preliminary decision support

  • The number of storage days is a user-entered criterion from the applicable code or the project's operational continuity requirement.
  • A preliminary decision-support estimate: the result does not replace an approved design calculation or review by a competent authority.
  • All percentages and inputs are user-defined; the calculation is purely arithmetic and assumes no particular code or specification.

Formula Summary

  • Required volume (L) = daily demand × storage days + other reserve
  • Water level (m) = volume(m³) ÷ footprint area

Results

Enter your data and press Calculate to see the results.

Engineering Insight

Increasing the storage days raises the required volume linearly and directly affects the tank's water level or footprint.

Recommended Action

Confirm the resulting water level is structurally and architecturally feasible before finalising the tank dimensions.

Next step

This calculator is fully usable as it is. Professional adds saved projects, calculation history and PDF/Excel reports; Premium adds the integrated workflows and the BOQ generator.

Workflow: Plumbing Design SuiteAll tools in this disciplineCompare levels and pricing

Storage sizing is simply demand × storage days plus any reserve you must hold. Enter those, plus the tank footprint you have space for, and the calculator returns the required volume and the resulting water depth so you can check it against the available head-room.

Method and assumptions

  • Required volume (L) = daily demand × storage days + other reserve
  • Water level (m) = volume(m³) ÷ footprint area
  • The number of storage days is a user-entered criterion from the applicable code or the project's operational continuity requirement.
  • A preliminary decision-support estimate: the result does not replace an approved design calculation or review by a competent authority.
  • All percentages and inputs are user-defined; the calculation is purely arithmetic and assumes no particular code or specification.

Worked example

24,000 L/day demand held for 2 days plus a 5,000 L reserve, in a tank with an 18 m² footprint.

Worked example results
ResultValue
Required volume (L)53,000 L
Required volume (m³)53 m³
Water level2.94 m

These figures are produced by the same calculator engine used on this page.

Frequently asked questions

How many storage days should I use?
That is a project or authority criterion you enter. The tool assumes no statutory storage period.
Is fire-water storage included?
No. Domestic storage only. Fire reserve is estimated separately in the Fire Water Tank Estimate tool.
Does the depth include freeboard?
No. The reported depth is the water level for the entered footprint; add freeboard and structural thickness yourself.

Related calculators

Next step

Free calculators are open to everyone. Project saving and PDF/Excel reports come with Professional, and integrated workflows with Premium.