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Square Footage Calculator
Calculate the area of any space in square feet, square meters, square yards, or square inches. Supports rectangles, circles, triangles, and trapezoids.
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Square Footage Calculator
How to Calculate Square Footage
Square footage is simply the area of a two-dimensional space. Here are the formulas for the most common shapes:
Rectangle or Square
Area = Length × Width
Circle
Area = π × Radius² (where π ≈ 3.14159)
Triangle
Area = 0.5 × Base × Height
Trapezoid
Area = 0.5 × (Base1 + Base2) × Height
Square Footage Conversion Table
| Unit | Equals (sq ft) | Conversion Factor |
|---|---|---|
| 1 Square Foot | 1.000 ft² | — |
| 1 Square Yard | 9.000 ft² | × 9 |
| 1 Square Meter | 10.764 ft² | × 10.764 |
| 1 Square Inch | 0.00694 ft² | ÷ 144 |
| 1 Acre | 43,560 ft² | × 43,560 |
Common Square Footage Examples
| Space | Typical Sq Footage |
|---|---|
| Parking space | 162 ft² (9 × 18) |
| Single-car garage | 200–250 ft² |
| Master bedroom | 200–300 ft² |
| Studio apartment | 400–600 ft² |
| Average US home (2023) | 2,299 ft² |
| Tennis court | 2,808 ft² |
| Basketball court (NBA) | 4,700 ft² |
| Football field | 48,000 ft² |
How to Measure Irregular Rooms
For L-shaped, T-shaped, or other irregular rooms:
- Divide the room into two or more rectangles.
- Measure the length and width of each rectangle.
- Calculate the area of each rectangle separately.
- Add all areas together for the total square footage.
For very irregular spaces, you can also measure the total bounding rectangle and subtract any areas that are not part of the space.
? Frequently Asked Questions
How do I calculate square footage of a room?
Multiply the length by the width of the room in feet. For example, a 12 ft × 15 ft room is 180 square feet. For L-shaped rooms, break them into rectangles, calculate each section, and add them together.
How many square feet are in an acre?
One acre equals exactly 43,560 square feet. If you need to convert acres to square feet, multiply the number of acres by 43,560.
How do I calculate square footage for flooring?
Measure the length and width of each room in feet, multiply to get square feet, add all rooms together, then add 10% for waste from cuts. Buy this total amount of flooring.
What is the difference between square feet and linear feet?
Square feet measure area (length × width), while linear feet measure just one dimension — length. You use linear feet for trim, baseboards, or fencing. You use square feet for flooring, paint, or land area.
Related Calculators
💡 Pro Tips
- ✅ For flooring, add 10% waste
- ✅ Break L-shaped rooms into rectangles
- ✅ Measure twice, buy once
- ✅ 1 sq ft = 144 sq inches
- ✅ 1 acre = 43,560 sq ft