Square Footage Calculator: instantly find room, house, or lot area by entering length and width - no manual math, formulas, or unit conversions required.
Age = Current date − Date of birth, adjusted for whether the birthday has occurred this year.The calculation converts entered dimensions into area or volume, then applies coverage, pack size, coats or waste where supported. Openings, slopes, pattern matching, uneven surfaces and manufacturer coverage can change the final purchase quantity.
This Square Footage Calculator calculates the square footage of a room, floor, wall, yard, or any other rectangular space. Input the length and width of the space to get the square footage. Include inches and feet if the calculator supports it. Accurate measurements are necessary in planning a flooring, paintable surface, tile pattern, landscape, renovation, or other project.
For example, a room measuring 14 feet long and 12 feet wide has an area of 168 square feet. Measurements do not need to be whole numbers. A dimension such as 10 feet 6 inches equals 10.5 feet.
In a square or rectangular area, square feet can be calculated by multiplying the length by the width. The units must be the same prior to multiplication.
To make sure the calculator gives a result in square feet, if length and width are in feet and inches, insert these respectively and multiply out, making sure to convert them to feet first! If the length and width are in inches, the result will be in square inches unless the calculator allows you to enter feet-and-inches separately.
Irregular Areas Generally one has to make more than one calculation. Break the irregular shape into simple rectangular sections, calculate the square footage for each and add together. This approach is usually better than trying to estimate the size of the whole irregular shape at one go.
Square Footage = Length × Width
Where:
For measurements containing inches:
Decimal Feet = Feet + (Inches ÷ 12)
For example, 11 feet 6 inches becomes:
11 + (6 ÷ 12) = 11.5 feet
If calculating several rectangular sections:
Total Square Footage = Area 1 + Area 2 + Area 3 + additional areas
Suppose a homeowner wants to determine the floor area of a bedroom before comparing flooring quantities. The room measures 13 feet 6 inches long and 11 feet wide.
Square Footage = Length × Width
First convert 6 inches into feet:
6 ÷ 12 = 0.5 feet
The room length is therefore 13.5 feet.
13.5 × 11 = 148.5 square feet
The bedroom has an estimated floor area of 148.5 square feet.
This number represents the measured floor area. It is not automatically the quantity of flooring that should be purchased because installation waste, cuts, layout, package sizes, and manufacturer instructions may affect material requirements.
Square footage provides a useful starting point for estimating materials sold or specified by area, but the measured area and the amount of material required are not always identical.
Projects involving flooring, tile, panels, roofing products, or other cut materials can generate waste because pieces must be trimmed around walls, corners, fixtures, openings, or unusual shapes. Complex layouts can create more offcuts than simple rectangular installations.
Package sizes also matter. A product may be sold by the carton, roll, sheet, bundle, or other package rather than in exact one-square-foot increments. Use the manufacturer's stated package coverage when converting calculated square footage into packages.
Do not assume that every product has the same waste allowance or coverage rate. Installation pattern, product dimensions, reusable offcuts, surface conditions, required layers, and manufacturer specifications can all affect the final quantity.
Calculate the total square footage of a space by multiplying the length by the width (both in feet). For example, a room 12 feet by 10 feet has 120 square feet (12 x 10 = 120). For spaces of irregular shape subdivide the space into rectangles, find the areas for each and add the results together.
Break the room into basic rectangular or triangular areas. Find the area of each section independently via length width (or for triangles use half of the base height), then sum up all the sub-area calculations to determine the entire square footage.
There's no real difference - "square footage" is the general term for the total area, while "square feet" (sq ft) is the unit of measurement used to express that area. Saying a room "is 200 square feet" describes its square footage.
There are 43,560 square feet in an acre. This helps to remember when converting land areas to be used in farm or landscape entries.
Take a square footage multiply by 0.0929 to find a square meter. For example, 1,000 square meter is approximately equal to 92.9 square meter. The most common use of this conversion is for international real estate or construction.
Yes, in most standard measurement practices, closets and hallways within the home's interior are included in total livable square footage. Garages, unfinished basements, and porches are usually excluded unless specifically noted.
Measure each section separately, add the sections and calculate before adding waste. Compare the result with the exact package coverage and round up to a purchasable quantity.
Square footage is used to measure the size of a 2-D surface. It is most often used for measuring areas of rooms, floors, walls, patios, decks, lawns and other home improvement areas. 1 square foot is the area of a square that is 1 foot long and 1 foot wide.
| Space Dimensions | Square Footage |
|---|---|
| 8 ft × 10 ft | 80 sq ft |
| 10 ft × 10 ft | 100 sq ft |
| 10 ft × 12 ft | 120 sq ft |
| 12 ft × 12 ft | 144 sq ft |
| 12 ft × 15 ft | 180 sq ft |
| 15 ft × 20 ft | 300 sq ft |
| 20 ft × 20 ft | 400 sq ft |
When estimating the total square footage of several rooms, calculate each room separately and add the results together. This method reduces errors when rooms have different dimensions.
For example, suppose a home project includes three rectangular spaces:
Total area = 270 + 168 + 40 = 478 square feet
If the spaces have alcoves, closets, extensions, or other irregular sections, measure those sections separately and include or exclude them according to the specific project.
If both measurements are available only in inches, multiply the length by the width to find square inches and then divide by 144 because one square foot contains 144 square inches.
Square Feet = (Length in Inches × Width in Inches) ÷ 144
For example, an area measuring 120 inches by 96 inches contains:
(120 × 96) ÷ 144 = 80 square feet
Square feet vs Linear feet-different units of measurement. Linear feet measure length, while square feet measure area. A board that is 10 linear feet long will not be 10 square feet. The width of that board must also be taken into account.
| Measurement | What It Measures | Example Use |
|---|---|---|
| Linear feet | Length | Trim, fencing, molding |
| Square feet | Area | Flooring, walls, rooms |
| Cubic feet | Volume | Soil, storage capacity, fill material |
Some home-improvement materials may be discussed in square yards rather than square feet. There are 9 square feet in 1 square yard.
Square Yards = Square Feet ÷ 9
For example, 270 square feet equals:
270 ÷ 9 = 30 square yards
The square footage needed for a specific project may differ from the advertised or total square footage of a home. Property square footage may describe living area, while a flooring, painting, or remodeling project may involve only selected surfaces.
Measure the actual project area whenever possible instead of relying only on real-estate listings, floor plans, or previous estimates. Closets, stairways, built-in cabinets, wall openings, and unfinished areas may need to be handled differently depending on what is being installed or measured.
For L-shaped or irregular areas, divide the space into smaller rectangles. Find the square footage of each rectangle and add the results. This approach works well for many rooms, patios, decks, and landscaping areas without requiring a single complicated formula.
For projects involving circles, triangles, highly irregular boundaries, slopes, or complex architectural layouts, a dedicated area or project-specific calculator may provide a more appropriate estimate.
Square footage is usually the starting measurement rather than the final purchasing quantity. Before ordering flooring, tile, panels, or other materials, verify the manufacturer's stated coverage, package quantity, installation instructions, layout requirements, and any appropriate allowance for cutting or waste.
Do not assume a standard waste percentage applies to every project. Material dimensions, room shape, installation pattern, damaged pieces, reusable offcuts, and project complexity can all affect the amount required.