Square Footage Calculator
Construction & Home ImprovementCalculate the square footage of a room or house from length and width in feet and inches, with quantity and cost-per-square-foot options.
Square Footage
The total area in square feet, including quantity if more than 1.
Estimated Total Cost
$0.00
Square footage multiplied by the price per square foot. $0 if no price is entered.
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Construction & Home Improvement calculators
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Odeh Ahwal0people find this calculator helpful
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Construction & Home Improvement calculators
Whether you're pricing out new flooring, listing a house for sale, or figuring out how much paint to buy, square footage is usually the first number you need. This calculator finds the area of a rectangular room, house, or lot from its length and width, in feet or feet-and-inches if that's how you measured.
Enter a quantity if you're calculating the same size room or panel multiple times, like several identical bedrooms or paver sections, and it multiplies the total for you. If you know the price per square foot of your material, whether it's flooring, tile, turf, or paint, enter it too and the calculator estimates the total cost alongside the area.
This tool assumes a rectangular (or square) space. If your room or lot has an irregular shape, like an L-shape or a bump-out, split it into two or more rectangular sections, calculate each one separately, and add the results together, the same approach every major square footage calculator recommends. It doesn't calculate volume (cubic feet), convert between area units like acres or square meters, or handle non-rectangular shapes like circles or triangles directly.
How to Calculate Square Footage
For a rectangular room, area is length times width, both measured in feet: length times width equals square feet. A room that's 12 feet long and 10 feet wide is 12 times 10, or 120 square feet.
If your measurements aren't a whole number of feet, decimal feet work too: a 13.5 by 11.25-foot room comes out to 151.88 square feet. Below, you can also enter extra inches instead of converting to decimal feet yourself.
What counts as square footage isn't always obvious. Standard finished, heated living space (bedrooms, kitchens, living rooms) always counts. Garages, unfinished basements, porches, and attics are usually excluded from a home's official listed square footage even though they're real, measurable spaces, since most local and national real estate standards only count finished, climate-controlled areas. If you're measuring for your own purposes, like flooring or paint, measure whatever space you're actually working on regardless of that convention.
Measuring in Feet and Inches
Most tape measures read in feet and inches, not decimal feet, so this calculator has a separate inches field for each dimension. A room measuring 12 feet 6 inches by 10 feet 3 inches is entered as 12 ft plus 6 in for length, and 10 ft plus 3 in for width, working out to 12.5 x 10.25, or 128.13 square feet.
Leave the inches fields at 0 if you already have decimal feet, like from a floor plan or a listing, since the inches only add extra precision on top of the feet value.
Multiple Rooms and Material Cost
The Quantity field multiplies your result, useful when you have several identical rooms, panels, or sections, like three matching bedrooms or a run of identical paver sections. For rooms of different sizes, calculate each one separately and add the totals together instead.
Enter a price per square foot and the calculator estimates the total material cost alongside the area. At $4.50 per square foot, a 120 square foot room comes to $540; the same room at quantity 2 with the same price comes to $1,080.
Pricing out concrete or paint specifically? The Concrete Volume Calculator and Paint Coverage Calculator handle those material-specific quantities directly.
Irregular Shapes and What's Out of Scope
This calculator handles rectangular and square spaces only. For an irregular shape, like an L-shaped room or a lot with a bump-out, split it into two or more rectangles, calculate each section's square footage separately, and add them together.
It also doesn't calculate volume. If you need cubic feet or cubic yards for concrete, mulch, or gravel, where depth matters as well as area, use the Cubic Yards Calculator instead. And it always returns square feet; for square meters or square yards, use the unit toggle on the result, or the dedicated Square Meters to Square Feet Converter for the reverse conversion.
Square Footage Calculators for Specific Projects
This is the general-purpose version. For a specific project with its own typical measurements or waste-factor conventions, one of these dedicated calculators may fit better:
- Square Footage Calculator for Painting a Room - wall area and paint coverage
- Square Footage Calculator for Flooring / Tiling - flooring and tile material estimates
- Square Footage Calculator for Real Estate Listings - listing-standard area measurement
- Square Footage Calculator for Gardening / Lawn - yard and garden bed area
- Square Footage Calculator for Commercial Office Space - office leasing and layout area
- Square Footage Calculator for HVAC / AC Unit Sizing - area for BTU/tonnage sizing
- Square Footage Calculator for Carpet / Rugs - carpet and rug material estimates
Frequently Asked Questions
How do I measure an irregularly shaped room?
Break the room into rectangular sections, calculate each section's square footage separately, then add them together. For triangular sections, multiply length by width and divide by 2.
What is square footage commonly used for?
Common uses include real estate listings, flooring and paint material estimates, HVAC sizing, and rental pricing comparisons (price per square foot).
Should I measure wall-to-wall or include closets and alcoves?
For most practical purposes (flooring, paint), measure the full usable floor area including closets. For real estate listing purposes, follow your local standard measurement guidelines, which can vary by region.
Do I need to enter inches, or is decimal feet fine?
Either works. Use the inches field if you measured with a tape measure and have a leftover few inches, like 12 ft 6 in; use decimal feet if your measurement already comes as a decimal, like from a floor plan or listing.
How do I calculate square footage for a 2-story house?
Calculate each floor's square footage separately using its own length and width, then add the totals together. This calculator gives you one floor (or one room) at a time.
Does this calculator show square meters or square yards?
The result is in square feet by default, with a unit toggle to switch the display to square meters. For a dedicated square yards or acres conversion, use one of the square footage unit converters instead.
Can I use this for a whole house with rooms of different sizes?
Yes, but calculate each differently sized room separately and add the results together. The Quantity field is only for multiplying identical rooms or sections, not adding different ones.
Why is my estimated total cost $0.00?
The price per square foot field defaults to $0, so the cost estimate stays at $0.00 until you enter a real price for your material.
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