Calculate area for rooms, properties, and various shapes. Perfect for flooring, painting, construction, and real estate measurements with precise calculations.
Square footage calculation is essential for various applications including construction, real estate, interior design, and landscaping. Different shapes require specific formulas for accurate area calculation.
Formula: Area = Length × Width
Most common shape for rooms and properties. Multiply the length by the width to get the area.
Formula: Area = π × Radius²
For circular areas. Radius is half the diameter. π ≈ 3.14159.
Formula: Area = ½ × Base × Height
For triangular spaces. Height must be perpendicular to the base.
Formula: Area = ½ × (Base1 + Base2) × Height
For spaces with two parallel sides of different lengths.
| Unit | Square Feet | Square Meters | Square Yards | Acres |
|---|---|---|---|---|
| 1 Square Foot | 1 | 0.0929 | 0.1111 | 0.000023 |
| 1 Square Meter | 10.764 | 1 | 1.196 | 0.000247 |
| 1 Square Yard | 9 | 0.836 | 1 | 0.000207 |
| 1 Acre | 43,560 | 4,047 | 4,840 | 1 |
Our square footage calculator uses precise mathematical formulas for each shape type. For standard geometric shapes like rectangles, circles, and triangles, the calculations are mathematically exact. The accuracy depends on the precision of your measurements. For best results, measure to the nearest 1/4 inch and double-check your inputs.
One square meter equals approximately 10.764 square feet. Square feet are commonly used in the United States for real estate and construction, while square meters are the international standard. Our calculator provides automatic conversion between both units, as well as other area measurements like square yards and acres.
For irregular shapes, divide the area into regular shapes (rectangles, triangles, circles), calculate each section separately, then sum the areas. For complex shapes, use the polygon option and input coordinates, or break down the space into manageable regular components. For very irregular spaces, consider professional measurement tools or services.
For flooring and painting calculations, include all permanent architectural features like closets, alcoves, and built-in areas. For real estate purposes, standards vary by location, but typically include all heated living spaces. Always clarify the purpose of your measurement and follow relevant standards for your specific use case.
For painting or wallpaper calculations, calculate the total wall area first, then subtract window and door areas. Standard doors are about 21 sq ft, windows vary from 10-20 sq ft. For precise estimates, measure each opening individually. Our calculator allows you to subtract specific areas after the main calculation.
For large outdoor areas: use a measuring wheel for accuracy, GPS measuring apps for very large properties, or satellite imagery tools. Break irregular shapes into triangles and rectangles. For acreage, remember 1 acre = 43,560 square feet. Always measure twice and account for slopes and terrain variations in your calculations.