BYTETOOLS

Square Footage Calculator

Calculate square footage and land area from rectangle dimensions or map coordinates (X,Y or lat/long). Get square feet, meters, yards, acres and hectares.

1,000
Square feet
92.9
Square meters
111.11
Square yards
0.022957
Acres
0.00929
Hectares

Summary

1,000 sq ft / 92.9 sq m / 111.11 sq yd / 0.022957 acres / 0.00929 ha

What is the Square Footage Calculator?

The ByteTools Square Footage Calculator turns a length and width, or a list of boundary coordinates, into an area shown at once in square feet, square meters, square yards, acres and hectares.

  • Rectangle mode: length × width in feet, meters or yards
  • Polygon mode: shoelace formula for planar X,Y survey coordinates
  • Latitude/longitude polygons measured with the spherical area formula
  • Results in square feet, square meters, square yards, acres and hectares
  • Clear error notes for bad input or fewer than three vertices
  • 100% client-side — coordinates and dimensions never leave your browser

How to use the Square Footage Calculator

  1. 1

    Pick an input method: Rectangle (length × width) or Polygon (coordinates).

  2. 2

    For a rectangle, enter length and width and choose feet, meters or yards.

  3. 3

    For a polygon, choose planar X,Y or latitude/longitude, then paste one vertex per line.

  4. 4

    Read the area in square feet, square meters, square yards, acres and hectares.

  5. 5

    Click Copy to grab the full summary of all five units.

About the Square Footage Calculator

The ByteTools Square Footage Calculator turns a length and width, or a list of boundary coordinates, into an area shown at once in square feet, square meters, square yards, acres and hectares. Choose rectangle mode for a simple room, deck or lot, or polygon mode when you have the corner points of an irregular parcel.

It is built for anyone sizing a space without survey software: homeowners costing flooring, turf or paint, real-estate agents describing lot size, gardeners planning beds, and roofers or contractors estimating material. Rectangle mode multiplies length by width in feet, meters or yards; polygon mode measures any shape from its vertices.

For land parcels you can paste latitude/longitude corners copied from a maps app and get the real-world ground area via the spherical polygon formula, or paste planar X,Y survey coordinates and let the shoelace formula do the work. Every calculation runs 100% in your browser — nothing is uploaded.

Frequently asked questions

How do I calculate the square footage of a room?

Measure the length and the width in feet, then multiply them: a 40 by 25 foot room is 1,000 square feet. Use rectangle mode, type both numbers, keep the unit on feet, and the area appears instantly along with the equivalent in meters, yards, acres and hectares.

Can this tool draw an area on a map?

No — this is an area calculator, not an interactive map you draw on. To measure a plot from a map, open it in Google Maps or another maps app, right-click each corner to copy its latitude and longitude, then paste those points one per line into polygon mode with the latitude/longitude option selected.

How do you calculate the area of an irregular shape?

List the corner coordinates in order around the perimeter and paste them into polygon mode. For flat survey grids the tool uses the shoelace formula on your X,Y points; for GPS corners it uses the spherical polygon formula so the ground area is correct even over large parcels.

How many square feet are in an acre?

One acre is 43,560 square feet, or about 4,047 square meters. This calculator shows acres alongside square feet and hectares for every result, so you can read lot size in whichever unit your listing, deed or planning form expects.

What is the shoelace formula?

It is a way to find the area of any simple polygon from its vertex coordinates by summing cross-products of consecutive points and halving the absolute total. It is exact for flat, planar X,Y coordinates such as those from a survey grid, which is why polygon mode uses it for planar input.

Are my measurements uploaded anywhere?

No. All the math runs locally in your browser with JavaScript, so dimensions and coordinates are never transmitted or stored. That keeps confidential parcel corners and client site data entirely on your device, and the tool works offline as a PWA.

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