All square footage calculators
Pick the calculator that matches your project — every tool is free, works in real time, and keeps your measurements private in your browser.
Core calculators
RoomMeasure any room — rectangular, L-shaped, or multi-section — in seconds.TriangleFind the area of triangular spaces, gables, and attic sections.RoofCalculate roof area with pitch adjustment for accurate estimates.ConcreteConvert slab square footage to cubic yards and bags of concrete.WallMeasure wall area for paint, wallpaper, or paneling — minus openings.Flooring / TileEstimate flooring and tile with a built-in waste factor.SidingCalculate exterior siding area for accurate contractor quotes.DrywallTurn wall and ceiling square footage into sheets of drywall.YardPlan sod, mulch, and fencing by measuring your yard area.CostEstimate total project cost from price per square foot.
Materials & finishes
CountertopCalculate countertop square footage for granite, quartz, or laminate — measure each counter segment, add a fabrication waste factor, and get the slab area to order.TileCalculate tile square footage for floors, walls, and backsplashes — measure the area, add a waste factor for cuts, and get the exact number of boxes to buy.CarpetCalculate carpet square footage — measure length × width, add a 10% waste factor for seams and cuts, and convert to square yards to order.PaintCalculate paint square footage and gallons — measure wall area, subtract doors and windows, then divide by 350 to see how much paint you need per coat.InsulationCalculate insulation square footage for attics and walls, then divide by the coverage per bag or roll to see how many batts or bags of blown-in you need.WallpaperCalculate wallpaper square footage — measure each wall, subtract doors and windows, add for pattern repeat, and see how many rolls to buy.ShowerCalculate shower tile square footage — add the three walls (width × height) plus the floor pan, then a 10% waste factor, to see how much tile to order.FenceCalculate fence square footage for staining or painting — multiply total length by height, double it for both sides, and divide by coverage for gallons.DeckCalculate deck square footage from length × width, split L-shapes into rectangles, add a 10% board waste factor, and estimate decking and stain to order.BrickCalculate brick square footage and how many bricks you need — measure the wall area, subtract openings, and multiply by about 7 bricks per square foot.
Rooms & interiors
StairsCalculate the square footage of stairs for carpet or flooring — count each step's tread plus riser, multiply by stair width, and add landings separately.FloorCalculate floor square footage fast — multiply length by width, add up each room and hallway, and split irregular floor plans into rectangles for the total.
Property & buildings
PoolCalculate pool square footage for covers, liners, and solar blankets — rectangular pools use length × width, round pools use π × radius². Deck measured separately.HouseCalculate the square footage of a house by adding up each finished room — measure length × width, sum every room and floor, and exclude the garage.ApartmentCalculate apartment square footage room by room — add each room's length × width to get the interior area for comparing rentals and cost per square foot.BuildingCalculate building square footage fast: multiply the footprint (length × width) by the number of floors for gross area, then separate usable and rentable space.WarehouseCalculate warehouse square footage — multiply length by width for the floor, add any mezzanine, and see gross vs. usable storage area for leasing and racking.AtticCalculate attic square footage for insulation and finished living space — measure the floor as length × width, then apply the 7-foot ceiling rule for usable area.DrivewayCalculate driveway square footage fast — measure length × width, split L-shaped or flared driveways into rectangles, and size concrete, asphalt, gravel, or sealer.GarageCalculate garage square footage — multiply floor length by width to size epoxy coating, storage, or a conversion. Note: a garage doesn't count as living area.BasementCalculate basement square footage by measuring the floor length × width. Below-grade basements are excluded from above-grade GLA and reported separately.OfficeCalculate office square footage with length × width. Get the numbers for a home-office tax deduction, a commercial lease, or flooring — plus the simplified $5/sq ft method.
Shapes
CircleCalculate the square footage of a circle — multiply pi by the radius squared. Enter a radius or diameter to get round area in square feet instantly.TrapezoidFind the square footage of a trapezoid — average the two parallel sides, multiply by the perpendicular height, and get the area in square feet fast.OctagonCalculate the square footage of a regular octagon from its side length or flat-to-flat width — use area ≈ 4.828 × side² or ≈ 0.828 × width² for gazebos, decks, and patios.L-Shaped RoomCalculate the square footage of an L-shaped room — split the L into two rectangles, multiply length × width for each, and add the two areas together.Irregular ShapeCalculate the square footage of any irregular or odd shape — divide it into rectangles, triangles, and circles, measure each, and add the areas together.HexagonCalculate the square footage of a regular hexagon from its side length or flat-to-flat width — area ≈ 2.598 × side², or split it into 6 equilateral triangles.
Outdoor & landscaping
LawnCalculate lawn square footage for sod, seed, fertilizer, and weed control — measure the grassed area, subtract the house and driveway, and get the number to buy by.StoneCalculate stone square footage, then convert to cubic yards or tons — measure your bed, pick a depth, and see exactly how much decorative rock to order.GravelCalculate gravel square footage, then convert to cubic yards and tons by depth — measure length × width and get exactly how much gravel to order for a driveway or path.SandCalculate how much sand you need — measure the area, set the depth, and get cubic yards or tons for paver bedding, sandboxes, or leveling.MulchCalculate the square footage of your beds and see exactly how many bags or cubic yards of mulch you need at a 2–3 inch depth to cover them.SodCalculate how much sod you need — measure your yard's length × width, subtract beds and driveways, add 5–10% for cuts, and get pallets to order.PaversCalculate paver square footage for a patio or walkway, then divide by your paver size to see how many pavers you need — plus a waste factor for cuts.AsphaltCalculate asphalt square footage for a driveway or lot — measure length × width, pick a thickness, and get the tons of hot-mix asphalt to order.
Unit conversions
Sq Ft to Sq MConvert square feet to square meters instantly. Multiply sq ft by 0.092903 (or divide by 10.7639) — 1,000 sq ft = 92.9 sq m. Exact factor, worked examples, and a live tool.Sq M to Sq FtConvert square meters to square feet instantly. Multiply square meters by 10.7639 — 100 sq m equals 1,076.4 sq ft. Free, accurate metric-to-imperial area converter.Sq Ft to Sq YdConvert square feet to square yards instantly. Divide square feet by 9 — 900 sq ft = 100 sq yd. Handy for carpet, which is often priced by the square yard.Sq Ft to AcresConvert square feet to acres instantly. 1 acre = 43,560 sq ft, so divide your square footage by 43,560 to get acres for land, lot, and property sizing.Acres to Sq FtConvert acres to square feet instantly. 1 acre = 43,560 sq ft — just multiply. Fast, accurate acre-to-square-foot converter for land, lots, and lawns.Sq Ft to HectaresConvert square feet to hectares instantly. Divide square feet by 107,639 to get hectares — 1 hectare = 10,000 m² = 107,639 sq ft = 2.471 acres.Sq Ft to MarlaConvert square feet to marla instantly. One standard marla equals 272.25 sq ft — divide your area by 272.25 to get marla, with regional variance noted.Sq Ft to KanalConvert square feet to kanal instantly. 1 kanal = 5,445 sq ft = 20 marla. Divide your square footage by 5,445 to get the plot size in kanal.Sq Ft to GazConvert square feet to gaz (square yards) instantly. 1 gaz = 9 sq ft, so divide square feet by 9 — used for plot and property sizes in Pakistan and India.Sq In to Sq FtConvert square inches to square feet instantly. Divide sq in by 144 — 144 sq in = 1 sq ft. Fast, exact converter for tile, upholstery, and small-part estimates.
Common room sizes
8×10 RoomA 8×10 room is 80 square feet (8 ft × 10 ft). See it in square meters and square yards, and how much flooring or paint you need.10×10 RoomA 10×10 room is 100 square feet (10 ft × 10 ft). See it in square meters and square yards, and how much flooring or paint you need.10×12 RoomA 10×12 room is 120 square feet (10 ft × 12 ft). See it in square meters and square yards, and how much flooring or paint you need.10×14 RoomA 10×14 room is 140 square feet (10 ft × 14 ft). See it in square meters and square yards, and how much flooring or paint you need.10×15 RoomA 10×15 room is 150 square feet (10 ft × 15 ft). See it in square meters and square yards, and how much flooring or paint you need.10×20 RoomA 10×20 room is 200 square feet (10 ft × 20 ft). See it in square meters and square yards, and how much flooring or paint you need.11×11 RoomA 11×11 room is 121 square feet (11 ft × 11 ft). See it in square meters and square yards, and how much flooring or paint you need.12×12 RoomA 12×12 room is 144 square feet (12 ft × 12 ft). See it in square meters and square yards, and how much flooring or paint you need.12×14 RoomA 12×14 room is 168 square feet (12 ft × 14 ft). See it in square meters and square yards, and how much flooring or paint you need.12×16 RoomA 12×16 room is 192 square feet (12 ft × 16 ft). See it in square meters and square yards, and how much flooring or paint you need.12×18 RoomA 12×18 room is 216 square feet (12 ft × 18 ft). See it in square meters and square yards, and how much flooring or paint you need.12×20 RoomA 12×20 room is 240 square feet (12 ft × 20 ft). See it in square meters and square yards, and how much flooring or paint you need.12×24 RoomA 12×24 room is 288 square feet (12 ft × 24 ft). See it in square meters and square yards, and how much flooring or paint you need.14×14 RoomA 14×14 room is 196 square feet (14 ft × 14 ft). See it in square meters and square yards, and how much flooring or paint you need.14×16 RoomA 14×16 room is 224 square feet (14 ft × 16 ft). See it in square meters and square yards, and how much flooring or paint you need.15×15 RoomA 15×15 room is 225 square feet (15 ft × 15 ft). See it in square meters and square yards, and how much flooring or paint you need.16×16 RoomA 16×16 room is 256 square feet (16 ft × 16 ft). See it in square meters and square yards, and how much flooring or paint you need.16×20 RoomA 16×20 room is 320 square feet (16 ft × 20 ft). See it in square meters and square yards, and how much flooring or paint you need.18×18 RoomA 18×18 room is 324 square feet (18 ft × 18 ft). See it in square meters and square yards, and how much flooring or paint you need.20×20 RoomA 20×20 room is 400 square feet (20 ft × 20 ft). See it in square meters and square yards, and how much flooring or paint you need.20×24 RoomA 20×24 room is 480 square feet (20 ft × 24 ft). See it in square meters and square yards, and how much flooring or paint you need.20×30 BuildingA 20×30 building is 600 square feet (20 ft × 30 ft). See it in square meters and square yards, and how much flooring or paint you need.30×40 BuildingA 30×40 building is 1200 square feet (30 ft × 40 ft). See it in square meters and square yards, and how much flooring or paint you need.40×60 BuildingA 40×60 building is 2400 square feet (40 ft × 60 ft). See it in square meters and square yards, and how much flooring or paint you need.