Square Footage Calculator
A Square Footage Calculator helps you quickly calculate the area of a room, house, office, yard, or piece of land in square feet (sq ft). Whether you’re installing flooring, buying carpet, painting walls, landscaping your garden, or estimating building materials, knowing the exact square footage helps you plan accurately and avoid costly mistakes.
Our free square foot calculator (also called a sq ft calculator or sqft calculator) supports multiple shapes and measurement units, making it easy to calculate areas for both simple and irregular spaces.
If you’re measuring larger properties, you may also find our Acreage Calculator, Square Feet to Acres Converter, and Acres to Square Feet Calculator helpful.
What Is Square Footage?
Square footage is a measurement of area, expressed in square feet (sq ft or ft²). It represents the amount of two-dimensional space inside a room, building, or parcel of land.
Square footage is commonly used for:
- Home and apartment sizes
- Office spaces
- Flooring and carpeting
- Roofing projects
- Landscaping
- Painting estimates
- Real estate listings
- Construction planning
For example, if a room measures 12 feet long and 10 feet wide, its area is:
Square Footage = Length × Width
12 × 10 = 120 sq ft
How to Calculate Square Footage
The simplest way to calculate square footage is to multiply the length by the width of the space.
Formula
Square Footage = Length × Width
Where:
- Length is measured in feet
- Width is measured in feet
The result is expressed in square feet (sq ft).
Example
A room measures:
- Length = 15 ft
- Width = 12 ft
Calculation:
15 × 12 = 180 sq ft
The room has an area of 180 square feet.
How to Measure Square Footage
Before calculating square footage, you’ll need accurate measurements.
Follow these simple steps:
- Measure the length of the room using a tape measure or laser distance meter.
- Measure the width of the room.
- Ensure both measurements use the same unit (preferably feet).
- Multiply the length by the width.
- If the room has an irregular shape, divide it into smaller rectangles and calculate each section separately.
- Add all the areas together to get the total square footage.
Measuring in Inches
If your measurements are in inches:
- Divide each measurement by 12 to convert inches into feet.
- Multiply the converted length and width.
Example:
- Length = 144 inches = 12 feet
- Width = 120 inches = 10 feet
Area:
12 × 10 = 120 sq ft
Calculate Room Square Footage
Calculating the square footage of a room is one of the most common uses of this calculator.
Bedroom Example
Length = 14 ft
Width = 12 ft
Area:
14 × 12 = 168 sq ft
Living Room Example
Length = 18 ft
Width = 15 ft
Area:
18 × 15 = 270 sq ft
Kitchen Example
Length = 10 ft
Width = 9 ft
Area:
10 × 9 = 90 sq ft
Entire House
To calculate the square footage of an entire house:
- Measure each room individually.
- Calculate each room’s area.
- Add all room areas together.
Example:
| Room | Square Footage |
|---|---|
| Living Room | 270 sq ft |
| Kitchen | 90 sq ft |
| Bedroom 1 | 168 sq ft |
| Bedroom 2 | 144 sq ft |
| Bathroom | 60 sq ft |
Total House Area = 732 sq ft
Square Footage Formulas for Different Shapes
Not every space is perfectly rectangular. Our calculator supports multiple shapes automatically.
| Shape | Formula |
|---|---|
| Rectangle | Length × Width |
| Square | Side² |
| Triangle | (Base × Height) ÷ 2 |
| Circle | π × Radius² |
| Trapezoid | ((Base₁ + Base₂) × Height) ÷ 2 |
| Parallelogram | Base × Height |
| Ellipse | π × Semi-major Axis × Semi-minor Axis |
| Regular Polygon | (Perimeter × Apothem) ÷ 2 |
Simply select the shape in the calculator and enter the required dimensions.
Why Use Our Square Footage Calculator?
Our calculator makes measuring areas fast and accurate.
Key Features
- Calculate square footage instantly
- Supports rectangular and irregular shapes
- Measure multiple rooms and total the results
- Works with feet, inches, yards, and meters
- Automatically converts between common area units
- Ideal for home improvement and construction projects
- Mobile-friendly and easy to use
Common Uses of a Square Footage Calculator
People use square footage calculations for many everyday tasks, including:
- Buying flooring or carpet
- Estimating paint requirements
- Measuring walls for wallpaper
- Installing tiles
- Roofing estimates
- Landscaping and lawn planning
- Concrete slab calculations
- Real estate property listings
- Interior design projects
- Construction planning
Knowing the correct area helps you purchase the right amount of materials and reduce waste.
Square Footage Unit Conversions
Our calculator can also convert between popular area units, including:
- Square feet to square meters
- Square meters to square feet
- Square feet to square yards
- Square yards to square feet
- Square feet to acres
- Acres to square feet
- Square inches to square feet
- Square feet to hectares
These built-in conversions eliminate the need for separate calculations.
Frequently Asked Questions
How do I calculate square footage?
Multiply the length by the width, using the same unit of measurement.
Formula:
Square Feet = Length × Width
How do I measure square footage?
Measure the length and width with a tape measure or laser measure. Convert all measurements into feet before multiplying them.
How do I calculate the square footage of a room?
Measure the room’s length and width in feet, then multiply them together.
Example:
12 ft × 10 ft = 120 sq ft
How do I calculate the square footage of a house?
Measure every room separately, calculate each room’s area, then add all the areas together to get the home’s total square footage.
How do I calculate square footage for irregular rooms?
Divide the room into simple shapes such as rectangles or triangles, calculate each section individually, and then add the results.
Can I calculate square footage using meters?
Yes. Measure in meters and convert the result into square feet, or use our calculator, which supports multiple measurement units automatically.
Related Area Calculators
If you’re working with measurements, construction, or land calculations, these tools can also help:
- Acreage Calculator – Calculate the area of land in acres using various shapes.
- Square Feet to Acres Converter – Convert square feet into acres instantly.
- Acres to Square Feet Calculator – Convert acreage into square feet for property planning.
- Square Feet to Square Meters Converter – Convert imperial measurements into metric units.
- Square Meters to Square Feet Converter – Convert metric areas into square feet.
- Percentage Calculator – Calculate percentages for project costs, material waste, discounts, and estimates.
Using these calculators together makes it easy to handle everything from room measurements to large-scale land planning.
Conclusion
A Square Footage Calculator is an essential tool for homeowners, contractors, architects, interior designers, real estate professionals, and DIY enthusiasts. Whether you’re measuring a single room, an entire house, or a piece of land, this calculator provides fast, accurate results in just a few clicks.
Instead of memorizing formulas or performing manual calculations, use our sq ft calculator to calculate areas, convert measurement units, and estimate materials with confidence.
For larger property measurements and unit conversions, explore our Acreage Calculator, Square Feet to Acres Converter, Acres to Square Feet Calculator, and Square Feet to Square Meters Converter to simplify all your area calculations.