How to calculate the square footage of a room?

Measure the length and width of the room in feet. Multiply length × width. For L-shaped rooms, divide into two rectangles, calculate each, and add them together. Include closets and alcoves if needed.

How is square footage calculated from inches?

Measure in inches, multiply length × width to get square inches, then divide by 144 to convert to square feet. Example: 150" × 180" = 27,000 sq in ÷ 144 = 187.5 sq ft.

Square Footage Calculator - Room, House & Area Calculator

Room Square Footage Calculator

Calculate square footage of any rectangular room or area. Supports feet, inches, or a mix of both.

Input Units

Length

Width

Square Footage Results

FORMULA: Square Footage = Length × Width. For feet & inches: convert inches to decimal feet (inches ÷ 12) before multiplying. Example: 12ft 6in = 12.5ft.

Shape Square Footage Calculator

Calculate square footage for rectangles, triangles, circles, trapezoids, and more.

Length (ft)

Width (ft)

Base (ft)

Height (ft)

Radius (ft)

Side A / Top (ft)

Side B / Bottom (ft)

Height (ft)

Split your L-shape into two rectangles (A and B):

Rect A Length (ft)

Rect A Width (ft)

Rect B Length (ft)

Rect B Width (ft)

Shape Area Results

Multi-Room / House Square Footage Calculator

Add multiple rooms to calculate total square footage for an entire house or project.

Room 1

Room Name

Length (ft)

Width (ft)

Room 2

Room Name

Length (ft)

Width (ft)

Room 3

Room Name

Length (ft)

Width (ft)

House Total Square Footage

TIP: For real estate purposes, only include finished, heated living spaces. Exclude garages, unfinished basements, and outdoor areas.

Square Footage Unit Converter

Convert between square feet, square meters, square yards, acres, and hectares.

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Conversion Results

Price Per Square Foot Calculator

Calculate total cost from square footage and price per sq ft, or figure price per square foot from total cost.

Calculation Mode

Total Area (sq ft)

Price per Sq Ft ($)

Cost Results

How to Calculate Square Footage

Square footage is the measurement of an area in square feet (ft²). It is the most common way to describe the size of a room, house, or piece of land in the United States. Our square footage calculator makes it easy to calculate the area of any space.

Basic Square Footage Formula

The fundamental formula to calculate square footage is: Area = Length × Width. Both measurements must be in feet. For a room measuring 12 feet by 14 feet: 12 × 14 = 168 square feet.

How to Calculate Square Footage with Feet and Inches

When measuring in feet and inches, first convert inches to decimal feet by dividing by 12. For example, 10 feet 6 inches = 10 + (6÷12) = 10.5 feet. Then multiply: 10.5ft × 12ft = 126 square feet. Our square footage calculator with feet and inches handles this conversion automatically.

How to Calculate Square Footage of a Room

To calculate the square footage of a room: measure the longest wall (length) and the shortest wall (width) in feet. Multiply them together. For irregularly shaped rooms, divide the space into rectangles, calculate each, and add them up. Include closets and nooks for accurate totals.

How to Calculate Square Footage of a House

Calculating the square footage of a house requires measuring every room individually and adding them together. Include all finished, heated living spaces: bedrooms, living rooms, kitchen, bathrooms, hallways, and closets. Exclude garages, unfinished basements, attics, and outdoor spaces.

How to Calculate Square Footage in a Triangle

For triangular areas: Area = ½ × Base × Height. Measure the base and the perpendicular height. Example: a triangular area with a 20ft base and 12ft height = ½ × 20 × 12 = 120 square feet.

Square Footage from Inches

To calculate square footage from inches: multiply length × width in inches to get square inches, then divide by 144 (since 1 sq ft = 144 sq in). Example: 96" × 120" = 11,520 sq in ÷ 144 = 80 square feet.

Frequently Asked Questions

How do you calculate square footage?+

Multiply the length by the width of the area, both measured in feet. For example, a 10ft × 12ft room = 120 square feet. For non-rectangular shapes, use the appropriate formula (triangle = ½ × base × height, circle = π × radius²).

How to calculate square footage of a room with feet and inches?+

Convert inches to decimal feet first: divide inches by 12. Then multiply. Example: 15ft 8in × 11ft 4in = 15.667ft × 11.333ft = 177.6 square feet. Our calculator handles this automatically.

How many square feet is a 12×12 room?+

A 12×12 room is 144 square feet (12 × 12 = 144). This is also exactly 1 roofing square or 16 square yards.

How do you figure square footage for tile?+

Calculate the floor area (length × width), then add 10-15% for waste from cuts and breakage. For a 10×12ft room (120 sqft): 120 × 1.10 = 132 square feet of tile needed.

How many square feet in an acre?+

There are 43,560 square feet in one acre. An acre is approximately 208.7 × 208.7 feet, or roughly the size of a football field (minus the end zones).

How to calculate square footage price?+

To find total cost: multiply square footage × price per sq ft. To find price per sq ft: divide total cost ÷ square footage. Example: 1,500 sqft at $3.50/sqft = $5,250 total.