Home & ConstructionFormula-based · Runs in your browser

Square Footage Calculator

Calculate area for repeated rectangular spaces in square feet, yards, and acres.

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Inputs

Enter the values you know. Optional fields may be left empty.

Local save controls below
Required
ft
Required
ft
Required

Result

Updates as valid inputs change.

Calculated locally
Total square feet
Area each
Square yards
Acres

Saved locally, explained clearly

Drafts, calculations, scenarios, and workflow progress stay in this browser unless you export them.

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Calculation steps

Follow what happened from the selected formula to the displayed answer.

Show substituted values and intermediate working
Calculate current inputs to see the working.
  1. 1

    Formula selected

    The calculator uses the following formula or method.

    Total square feet = length × width × quantity

  2. 2

    Values entered

    Your values are placed into the calculation.

    Enter values to see what is used in this step.

  3. 3

    Result calculated

    The formula or method produces the following result values.

    Results will appear after a successful calculation.

  4. 4

    Answer formatted

    Displayed values are rounded and formatted using each output’s configured precision.

Scenario comparison

Save working scenarios, then select two or three to compare. Formula versions and inputs remain visible.

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Recent calculations

Successful calculations are retained locally according to your privacy settings.

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Data and privacy

How it works

Length and width are multiplied for one rectangle, then multiplied by quantity.

Input query strings and outputs

Use an input name in this page’s URL as ?name=value, and join additional inputs with &. Portable shared links may instead use the compact ?ac= state parameter.

Input query strings

3
  • ?length= Length

    Number · Required · Default: 12

  • ?width= Width

    Number · Required · Default: 10

  • ?quantity= Number of equal areas

    Number · Required · Default: 1

Outputs

4
  • totalSquareFeet Total square feet

    Number · Primary output

  • singleArea Area each

    Number

  • squareYards Square yards

    Number

  • acres Acres

    Number

Irregular spaces

Split an irregular floor into rectangles and add the results.

Sources
Limitations
  • Material quantities are estimates. Confirm site dimensions, product coverage, waste, and local requirements before ordering or construction.