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Rectangle Square Footage Calculator

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Results

Area is 100.00 sq ft.

Area
sq ft
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How to use this calculator

  1. Enter Length
    Enter the rectangle's length. This field starts in ft; its choices are ft, in, cm, ft/in, and m/cm.
  2. Enter Width
    Enter the adjoining width measurement. This field also starts in ft and offers ft, in, cm, ft/in, and m/cm.
  3. Read Area

Area (sq ft) vs Length (ft)

9583.30.10.01958.3

Area (sq ft) Length (ft)

What this calculates

This page follows its stated rectangle calculation. It labels examples by origin. Source-backed facts carry source markers. 1

The remaining sections place related questions beside the limits of supplied evidence. The FAQ addresses topics left open by those sections. Calculator-specific boundaries are stated in the page's own terms. 2

The rectangle calculation

Short formula: area_sq_ft = length * width. This is the equation the page applies. Its symbols are the calculator's input and output ids. 1

Named stages: express both side measurements in feet, then multiply. Each stage names an action, not a new input. This keeps the explanation in calculation order. 1

Definitions: length is the entered length value. width is the entered width value. area_sq_ft is the computed rectangular area in square feet. 1

Worked examples

5 ft × 3 ft rectangle (page-derived example: 15 sq ft): Area 15.00 sq ft

See inputs and calculation

Starting values

Length
5 ft
Width
3 ft
    1. Area: 15.00 sq ft
      Show arithmetic
      5 * 3
    Original example and source context

    Answer: 100 sq ft. Inputs: Length 10 ft and Width 10 ft. Multiply stage: 10 × 10 = 100. Value-table row: 10 ft, 10 ft → 100 sq ft. Provenance: formula-derived page check, not a source-published value. 2 Source context: the published example gives width 5, height 3, and area 15, with units unstated. The page's corresponding row is 5 ft, 3 ft → 15 sq ft. Provenance: source math-is-fun, excerpt worked-example-unit-unspecified; origin published numeric pin, with units supplied by page mapping. 2

    Other outlines

    An excerpt contains a triangle-area example. The FAQ explains that source context. No additional triangle procedure is introduced here. 2

    The excerpts give no method for rectangle borders, circles, rings, edge-length triangles, trapezoids, sectors, or parallelograms. L-shaped room splitting is also unexplained. No second-check method for irregular spaces appears. 1

    Project and material questions

    The excerpts give no guidance for flooring installation, house painting, or building a home. They offer no instructions for hardwood, carpet, tile, wall paint, ceilings, roofing, or shingles. Concrete, lawn, sod, mulch, pavers, drywall, and insulation also receive no instructions. 1

    The sources provide no cost-per-square-foot figures, optional cost estimates, or material prices. They state no surplus allowance, material-specific waste factor, or common room dimensions. These excerpts give no purchasing rules for those projects. 1

    Homes, records, and measurement

    The excerpts provide no method for measuring a house or property from rooms, walls, floor plans, or blueprints. They give no instructions for subtracting openings. 1

    The excerpts do not discuss the named ANSI finished-area standard or define livable or finished area. They do not explain interior versus exterior measurement or usable versus total area. 1

    They provide no property valuation guidance or explanation for differences across tax records, appraisers, and MLS listings. Contractor and appraiser tips, sketches, pre-order records, quote contents, manufacturer specifications, and common-mistake checks are also absent. 1

    Unit reference

    The source refers to feet, inches, centimeters, and yards as length units. Square feet, square meters, yards, and acres receive no glossary definitions in the supplied excerpts. The source's unit notes concern length measurements. 1

    Turn inches into feet first

    If you have measurements in inches, divide them by 12 to get feet. With length and width in feet, you can calculate area in square feet. 1

    What the sources leave open

    The sources give you a way to convert inches to feet and calculate area from measurements in feet. They do not explain how to go from confused to confident, why you should calculate square footage, or what final remarks to make. 1

    Key facts

    • Divide inches by 12 to get feet. 1 1
    • Divide centimeters by 30.48 to get feet. 1 1
    • Multiply yards by 3 to get feet. 1 1

    How this is calculated

    Calculate the area of a rectangle or square from its perpendicular length and width. The page converts the chosen side units to feet, then uses area = length × width and returns square feet. This page does not calculate other shapes.

    Area

    A
    • A = Area
    Understand each part

    These names are shorthand for the exact calculations below, not different formulas.

    1. Length (L)

      The entered rectangle side, converted to feet.

      See the definition of Llength
    2. Width (W)

      The perpendicular rectangle side, converted to feet.

      See the definition of Wwidth
    3. Area (A)

      Square footage found by multiplying the length and width in feet.

      See the definition of AL * W
    Follow the calculation with your values
    1. Area: 100.00 sq ft
      Show arithmetic
      10 * 10
    Full formulas, symbols and sources

    area_sq_ft = length * width

    length
    Length (ft)
    width
    Width (ft)
    area_sq_ft
    Area (sq ft)

      Frequently asked questions

      How do I calculate square footage?
      Use this page's rectangle case and enter its side measurements in the named fields. The supplied sources do not establish a universal procedure for every outline. 1
      How do I calculate square footage for different shapes?
      The triangle excerpt uses its base and height to find area, then adds the triangle areas. It supplies no matching instructions for circle or ring shapes. 2
      How do I convert square feet to square meters?
      The supplied excerpts do not give a conversion from square feet to square meters. They provide no metric area value for that conversion. 1
      How do I convert acres to square feet?
      No acre-to-square-foot conversion appears in the supplied excerpts. The named yard conversion concerns length measurement. 1
      Can I combine different units between Length and Width?
      The controls offer unit choices for each side, but the cited excerpts do not explain mixed-unit entries. They do not state how the page handles such combinations. 1
      How many flooring boxes should I order?
      The supplied sources give no coverage rate per box or package count. They do not provide a flooring quantity from area alone. 1

      Limitations & common mistakes

      • Page-choice, not formula, bounds: Length and Width accept 0.01 to 1000 ft; outside, calculator refuses and states the limit.
      • The page computes results from entered numbers, only to their precision; they do not replace measurement or required professional judgment.

      By Editorial Team, Assembled from the cited primary sources; not yet expert-reviewed

      Last updated

      Sources current as of

      How we review

      Formula, sources, and review

      This calculation follows the formula published on this page and rests on 2 cited sources, listed under Sources below. Last checked .

      How we review

      Sources & methodology

      Sources

      • 1 Square Footage Calculator — last verified
      • 2 What is Area? — last verified