If you are trying to convert feet to square feet, this calculator makes it quick and accurate. Because square feet is an area measurement, you need two dimensions (length and width), not just one. Enter your values below and get instant square footage, including optional quantity and waste factor.
How to use this feet to sq feet calculator
This tool is designed for flooring, tile, sod, paint coverage planning, drywall, and room measurement. Follow these simple steps:
- Enter the length in feet (and inches if needed).
- Enter the width in feet (and inches if needed).
- Add quantity if you have multiple rooms or sections with the same size.
- Add a waste percentage to account for cuts, mistakes, or pattern matching.
- Click Calculate Square Feet.
Feet to square feet formula
The base formula is:
Square Feet = Length (ft) × Width (ft)
If you have inches, convert inches to feet first:
- Total length (ft) = feet + (inches ÷ 12)
- Total width (ft) = feet + (inches ÷ 12)
Then:
Square Feet = Total Length × Total Width
Linear feet to square feet
Many people search “feet to sq feet calculator” when they really mean linear feet to square feet. That conversion requires width:
Square Feet = Linear Feet × Width (feet)
Examples
Example 1: Basic room size
A room is 12 ft by 10 ft.
Area = 12 × 10 = 120 sq ft
Example 2: Feet + inches
A space is 9 ft 6 in by 7 ft 3 in.
- 9 ft 6 in = 9.5 ft
- 7 ft 3 in = 7.25 ft
- Area = 9.5 × 7.25 = 68.88 sq ft
Example 3: Add 10% waste
If you need 200 sq ft and add 10% waste:
200 × 1.10 = 220 sq ft
Common room sizes and square footage
| Length | Width | Square Feet |
|---|---|---|
| 8 ft | 10 ft | 80 sq ft |
| 10 ft | 10 ft | 100 sq ft |
| 10 ft | 12 ft | 120 sq ft |
| 12 ft | 12 ft | 144 sq ft |
| 12 ft | 15 ft | 180 sq ft |
| 15 ft | 20 ft | 300 sq ft |
Tips for accurate square footage measurement
- Measure each wall twice to reduce mistakes.
- Break irregular rooms into rectangles and add results.
- Use inches for better precision on tight layouts.
- Always include a waste factor for flooring and tile projects.
- Round up material purchases to avoid running short.
Frequently asked questions
Can I convert one number in feet directly to square feet?
No. Square feet is area, so you need two dimensions: length and width.
How many square feet are in a 10x10 room?
A 10 ft by 10 ft room has 100 square feet.
What if my room is not a perfect rectangle?
Split the room into smaller rectangles, calculate each area, then add them together.
Should I add extra square footage for materials?
Yes. For flooring and tile, 5% to 15% extra is common depending on pattern complexity and cut waste.
Final thoughts
A feet to sq feet calculator is one of the easiest ways to estimate materials and avoid expensive ordering mistakes. Enter dimensions carefully, include a realistic waste percentage, and always round up when purchasing material for your project.