Square Foot Calculator
Calculate the area of a room, floor, wall, or other rectangular space in square feet using its length and width.
Enter your measurements below to quickly calculate square footage, square meters, and other useful area measurements.
Calculate Square Feet
Enter the length and width of the area you want to measure.
Square Footage Result
Square Foot Calculation Summary
Length
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Width
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Area
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Square Meters
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What Is Square Footage?
Square footage is a measurement of area commonly used in the United States and other countries for rooms, homes, floors, buildings, land, and construction projects.
One square foot represents an area that is one foot long and one foot wide. For a rectangular space, square footage can be calculated by multiplying the length by the width.
For example, a room that is 20 feet long and 15 feet wide has an area of 300 square feet.
Square Footage Formula
For a rectangular or square area, use this simple formula:
Area = Length × Width
When both measurements are in feet, the result is expressed in square feet (ft²).
If your measurements are in inches, yards, meters, or centimeters, the calculator converts them before calculating the equivalent square footage.
Square Footage Examples
| Length | Width | Area |
|---|---|---|
| 10 ft | 10 ft | 100 ft² |
| 20 ft | 15 ft | 300 ft² |
| 30 ft | 20 ft | 600 ft² |
| 40 ft | 25 ft | 1,000 ft² |
Tips for Measuring Square Footage
Measure the length and width as accurately as possible. For construction, flooring, painting, or material estimates, small measurement errors can affect the amount of material required.
If a space has an irregular shape, divide it into smaller rectangles or squares. Calculate the area of each section separately and then add the results together.
For material purchases such as flooring or tile, consider adding an appropriate waste allowance after calculating the total area.
Square Foot Calculator FAQ
How do I calculate square feet?
Multiply the length of the area by its width when both measurements are in feet. For example, 20 ft × 15 ft = 300 square feet.
How many square feet are in one square meter?
One square meter is approximately 10.7639 square feet.
Can I calculate square feet using inches?
Yes. Enter both dimensions in inches and select Inches as the measurement unit. The calculator converts the result to square feet.
How do I calculate square footage for an irregular room?
Divide the room into smaller rectangular sections. Calculate the square footage of each section and add those areas together.
Is square footage the same as square feet?
Yes. Square footage describes an area's measurement in square feet, usually written as ft² or sq ft.