Square Footage Calculator
Calculate the area of rooms and spaces from dimensions. Supports multiple shapes and multi-room totals.
How It Works
- 1
Select your room shape
Choose from rectangle, triangle, circle, trapezoid, or L-shaped. Select feet or meters as your measurement unit.
- 2
Enter dimensions
Input the required measurements for your chosen shape. For multiple rooms, click 'Add Room' to calculate a combined total.
- 3
Review results and estimate costs
See the area in both square feet and square meters. Optionally enter a price per square foot to estimate material costs.
Understanding Square Footage Calculations
Square footage is a fundamental measurement used in real estate, home improvement, and construction to quantify the area of a space. It is calculated by multiplying the length by the width of a rectangular area, both measured in feet. The result is expressed in square feet (ft²). For non-rectangular spaces, different geometric formulas apply: triangles use ½ × base × height, circles use π × radius², and trapezoids use ½ × (side A + side B) × height. For irregular or L-shaped rooms, the common approach is to divide the space into simpler shapes, calculate each area separately, and sum them together. Understanding square footage is essential for estimating flooring materials, paint coverage (a gallon of paint typically covers 350–400 sq ft), carpet or tile quantities, and overall construction costs. In real estate, the price per square foot is a key metric for comparing property values across different listings. To convert between square feet and square meters, multiply by 0.0929 (1 sq ft ≈ 0.0929 m²), or divide square meters by 0.0929 to get square feet. Our calculator supports five common room shapes and allows you to add multiple rooms for a combined total, making it easy to plan renovations or estimate costs for an entire home.
Frequently Asked Questions
How do I calculate the square footage of a room?
For a rectangular room, multiply the length by the width in feet. For example, a 12 ft × 15 ft room is 180 square feet. For other shapes, use the appropriate formula: triangles (½ × base × height), circles (π × radius²), or break irregular rooms into smaller rectangles and add them up.
How do I convert square feet to square meters?
Multiply the square footage by 0.0929 to get square meters. For example, 200 sq ft × 0.0929 = 18.58 m². Conversely, multiply square meters by 10.764 to get square feet.
How much flooring material do I need?
Calculate the total square footage of all rooms, then add 10% for waste and cuts. For example, if your rooms total 500 sq ft, purchase at least 550 sq ft of material. For diagonal installations, add 15% instead.