▦ Square FootageCalculator
Calculators RoomHouseRoofRoof PitchHip RoofTileGrout & ThinsetFlooringDeckPaintPainting CostConcreteCountertopCabinetsBaseboard & TrimWall / DrywallConcrete BlockLawnPoolRectangleTriangleCircleIrregular ShapePrice Per Sq FtBTU by Sq FtFeet & InchesSquare Meter
Converters Area Converter (All Units)Acreage CalculatorAcres to HectaresSq In to Sq FtSq Ft to Sq YardsLinear Foot CalculatorCubic Yard CalculatorSq Ft to Sq MetersSq Meters to Sq Ft
Guides How to Calculate Square FootageWhat Is a Square FootSquare Footage ChartStandard Room SizesAverage Bedroom SizeCloset DimensionsCountertop DimensionsStandard Ceiling HeightStandard Door SizesStandard Garage SizeGarage ConversionPool Table Room SizeConference Room SizeHow Sq Ft Is MeasuredCommercial Sq FtGross Floor AreaGross vs Net Sq FtDoes a Garage CountAverage House SizeAverage Apartment SizeAC Size by Sq FtWhat Counts as Sq FtANSI Z765 StandardGross Living AreaDoes a Basement CountBasement TypesDoes a Sunroom CountWhat Is a Florida RoomDoes an Attic CountDo Porches & Decks CountDo Closets CountDo Stairs CountAbove vs Below Grade

About Square Footage Calculator

Square Footage Calculator is a free set of area calculators, unit converters and plain-English guides for anyone measuring a room, a house, a roof or a material order. You can use every tool without an account, and nothing you type into a calculator leaves your browser.

What you will find here

  • Calculators for rooms, whole houses, roofs, flooring, tile, paint, concrete, decks, lawns and odd shapes, with feet and inches handled for you.
  • Converters between square feet, square meters, square yards, acres, hectares and other units.
  • Guides that answer the questions behind the numbers, such as what counts as square footage in a home listing or appraisal.

How the calculators work

Every calculator runs in your browser using standard geometry and exact unit conversion factors. Your measurements are not sent to us or stored anywhere, so you can refresh the page and start over at any time.

How we write and check pages

  • Each page answers the question it targets first, then explains the details.
  • We are reviewing every page against primary sources such as NIST, building codes and the ANSI Z765 standard, and each fact on a reviewed page is checked a second time by a separate reviewer.
  • We link out only to authoritative sources so you can check our work.
  • We update pages when standards, rules or data change.

Corrections

If a result or a fact looks wrong, tell us on the contact page. We check every report and fix confirmed errors as soon as we can.

How the site is funded

The site is free to use. Some pages may include affiliate links to tools or materials, and we may earn a commission if you buy through them at no extra cost to you. Affiliate relationships never change a calculation or a recommendation. Details are in our affiliate disclosure.

Important

Results are estimates for planning. Check measurements on site and confirm material quantities with your supplier or contractor before you buy. See the full disclaimer.