Calculate square footage for rooms, floors, walls, patios, lawns, lots, and generic projects. Combine rectangles, squares, circles, triangles, trapezoids, and known areas as additions or deductions.
Square footage measures two-dimensional area. Each section is normalized to square meters, multiplied by quantity, assigned an add or subtract sign, and summed before display conversion.
This approach supports irregular spaces by splitting them into simpler shapes without rounding individual sections before the total.
area = length × widtharea = side²area = π × radius²area = base × height ÷ 2area = (base 1 + base 2) ÷ 2 × heightsum(section area × quantity × add/subtract sign)A 12 × 15 ft room is 180 ft², or approximately 16.7225 m².
A 20 × 15 ft main area plus a 5 × 6 ft closet minus a 3 × 2 ft fireplace totals 324 ft².
A 10 ft diameter circle has a 5 ft radius and area of approximately 78.5398 ft².
A 12 × 10 ft triangle is 60 ft². A trapezoid with 10 ft and 14 ft bases and 6 ft height is 72 ft².
Represent an irregular project as several simple added sections and subtract openings or exclusions.
Sections can use different length or known-area units; normalization occurs before summing.
Cost reflects only the price per square foot or square meter you enter and does not imply labor or material scope.
Quantity is applied before the section's add or subtract operation. Deductions cannot make the final project area negative.
The shared area converter produces square inches, feet, yards, meters, acres, and hectares from the canonical square-meter total.
Perimeter is shown in the section breakdown for rectangles, squares, and circles. Triangle and trapezoid perimeter is omitted because the provided dimensions do not define every side.
Multiply length by width for rectangles, or select the appropriate shape formula.
Add one section per room and calculate the combined signed total.
Set that section's operation to Subtract, such as a fireplace or opening.
Enter its diameter or radius; the calculator reuses circle-area geometry.
One acre contains 43,560 square feet.
The result uses the shared area conversion engine and displays both units.
Total square feet or meters are multiplied by the price you provide.
Split the space into simpler sections, then add or subtract them.