Square Footage Calculator
Calculate square footage, square meters, yards, and acres for any shape. Estimate material costs for flooring, tile, carpet, and more.
| Unit | Area |
|---|
Area Conversion Reference
Area unit conversions below let you quickly change between square feet and other common area measurements.
| From | To Square Feet | To Square Meters | To Acres |
|---|---|---|---|
| 1 sq inch | 0.00694 ft² | 0.000645 m² | 0.0000000159 |
| 1 sq foot | 1 ft² | 0.092903 m² | 0.0000229568 |
| 1 sq yard | 9 ft² | 0.836127 m² | 0.000206612 |
| 1 sq meter | 10.7639 ft² | 1 m² | 0.000247105 |
| 1 acre | 43,560 ft² | 4,046.86 m² | 1 |
| 1 sq km | 10,763,910 ft² | 1,000,000 m² | 247.105 |
How to Calculate Square Footage
Square footage calculation depends on the shape of the area you are measuring. The most common scenario is a rectangular room where area = length × width.
Rectangular and Square Rooms
For a rectangle, multiply length by width in feet. For a 15 ft by 12 ft room, area = 180 sq ft. For a square room, multiply the side length by itself.
Circular Areas
For circular areas like round patios, use area = π × (diameter / 2)². A circular patio 12 ft in diameter has area π × 6² ≈ 113.1 sq ft.
Adding a Waste Factor
When ordering flooring, tile, or carpet, always add a waste factor of 5 to 15 percent to account for cuts, breakage, and pattern matching. Enter this percentage in the calculator to get the adjusted total quantity.
Estimating Material Cost
Enter the price per square foot (or square meter or yard) to get the total material cost. This is useful for flooring, paint, sod, or any material priced per area unit.
Frequently Asked Questions
To calculate square footage of a rectangular room, multiply the length by the width in feet. For example, a room 12 feet long and 10 feet wide has an area of 12 × 10 = 120 square feet.
To convert square feet to square meters, multiply by 0.092903. For example, 100 square feet × 0.092903 = 9.29 square meters.
One acre equals exactly 43,560 square feet. To find the acreage of a piece of land, divide the total square footage by 43,560.
For an irregular room, divide the space into simpler shapes such as rectangles or triangles. Calculate the area of each section separately using the appropriate formula, then add all sections together to get the total area.
To calculate material cost, multiply the total area by the price per square foot. Add a waste factor of 5 to 10 percent for materials like tile or carpet to account for cuts and overage.