Square Feet Calculator
Calculate square footage quickly for rooms, houses, floors, walls, yards and other rectangular areas. Enter your dimensions and get the result in square feet, square meters and square yards.
Calculate Square Feet
Free Square Feet Calculator
This free square feet calculator helps you quickly determine the area of a room, house, floor, wall, office, garage, yard or other rectangular space. It can also be used as a square footage calculator, square foot calculator, sq ft calculator or sqft calculator.
Enter the length and width, choose the measurement unit, and the calculator converts the result into square feet. You can enter measurements in feet, inches, meters or yards.
If you are measuring an area for flooring, carpet, tile or another material, the optional waste allowance can provide a larger planning estimate. The waste percentage is not part of the actual measured floor area; it is simply an additional material allowance.
How to Calculate Square Feet
The basic way to calculate square feet is to multiply the length by the width when both measurements are expressed in feet.
For example, if an area is 20 feet long and 15 feet wide:
Therefore, the area is 300 square feet.
How to Find Square Footage
To figure out square footage, measure the two sides of the rectangular area and multiply them. Always make sure both measurements use the same unit before applying the formula.
Length = 18 feet
Width = 12 feet
18 × 12 = 216 square feet
This is the same basic process used when you calculate square feet for a room, floor, office, garage or other rectangular area.
How to Calculate Square Feet of a Room
To calculate the square feet of a room, measure the room's length and width. If both measurements are in feet, multiply them directly.
Length = 12 feet
Width = 10 feet
12 × 10 = 120 square feet
A 12-foot by 10-foot room therefore has 120 square feet of floor area. The same calculation can be used for bedrooms, living rooms, kitchens, offices, garages and other rectangular rooms.
How to Measure a Room for Square Feet
Measure from one wall to the opposite wall for the length. Then measure the other direction for the width. Record both measurements using the same unit and multiply them.
For greater accuracy, measure each dimension more than once, especially when the walls are not perfectly straight.
How to Calculate Square Feet of a House
A simple rectangular house can be calculated by multiplying the overall length by the overall width. However, many houses contain multiple sections, additions or irregular layouts.
If the house cannot be treated as one rectangle, divide the floor plan into smaller rectangular areas. Calculate each section separately and add the results.
Main section: 30 ft × 20 ft = 600 sq ft
Additional section: 10 ft × 12 ft = 120 sq ft
Total = 600 + 120 = 720 square feet
This approach is useful when calculating the approximate floor area of a house with several rectangular sections.
How to Calculate Square Feet of an Irregular Area
An irregular room does not have to prevent you from calculating square footage. Divide the space into smaller rectangles or squares. Calculate each section separately and then add the areas together.
Section A = 15 ft × 10 ft = 150 sq ft
Section B = 8 ft × 6 ft = 48 sq ft
Section C = 5 ft × 4 ft = 20 sq ft
Total = 218 square feet
This method is often easier than trying to apply one formula to an irregular shape.
How to Calculate Square Feet From Inches
If your measurements are in inches, multiply the length by the width to get square inches. Then divide by 144 because one square foot contains 144 square inches.
Length = 120 inches
Width = 144 inches
120 × 144 = 17,280 square inches
17,280 ÷ 144 = 120 square feet
The calculator above performs this conversion automatically when you select Inches.
How to Calculate Square Feet From Meters
When measurements are given in meters, first calculate the area in square meters. One square meter is approximately 10.7639 square feet.
Length = 5 meters
Width = 4 meters
5 × 4 = 20 square meters
20 × 10.7639 ≈ 215.28 square feet
Select Meters in the calculator to convert the measurements automatically.
Square Feet and Square Yards
Square yards and square feet are both units used to describe area. One square yard equals 9 square feet.
To convert square feet into square yards, divide the square footage by 9.
450 square feet ÷ 9 = 50 square yards
Square Feet Conversion Table
These common area conversions can help when comparing measurements reported in different units.
| Area | Equivalent |
|---|---|
| 1 square foot | 0.092903 square meters |
| 1 square meter | 10.7639 square feet |
| 1 square yard | 9 square feet |
| 1 square foot | 0.111111 square yards |
| 144 square inches | 1 square foot |
Using Square Footage for Flooring and Materials
Square footage is commonly used when estimating how much flooring, carpet, tile or other area-based material may be needed.
First calculate the actual floor area. Then consider an additional allowance for cuts, fitting, damaged pieces or installation waste. The correct allowance depends on the material, installation pattern and project.
Room area = 300 sq ft
Waste allowance = 10%
300 × 1.10 = 330 sq ft estimated material area
The calculator's optional waste field provides this additional planning estimate while keeping the actual square footage separate.
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