Home Calculators

Water Tank Volume Calculator

Estimate rectangular tank volume in gallons. The estimate updates in your browser as you type.

Tank volume 119.688 gal

Local estimate.

What this tool is for

Water Tank Volume Calculator is built for home project planning inside home calculators when you need to turns tank dimensions into gallons. It focuses on water tank volume instead of making you adapt a broad calculator to a narrow task.

When to use it

Use it when length, width, and height are already known and you want a fast estimate before comparing options, checking a worksheet, or copying the result into another workflow.

Inputs

  • Length describes the size or distance used in the calculation. Use ft for this field.
  • Width describes the size or distance used in the calculation. Use ft for this field.
  • Height describes the size or distance used in the calculation. Use ft for this field.

Formula

gallons = length x width x height x 7.48052

Example

4 x 2 x 2 ft holds about 119.69 gallons.

What the result means

The result labeled "Water Tank Volume" is the direct output of gallons = length x width x height x 7.48052. In the worked example, 4 x 2 x 2 ft holds about 119.69 gallons.

Before you rely on the result

Use the estimate before shopping or planning. Product coverage, waste, local code, site conditions, and safety requirements may change the final amount.