Area Calculator
Calculate area and perimeter for rectangles, circles, triangles, and squares
Shape Dimensions
Select a shape and enter its dimensions
Calculation Result
Area and perimeter calculations
Select a shape and enter dimensions to calculate area
Common Examples
Click to load common shape examples
Room (10×12)
rectangle
Tile (5×5)
square
Pizza (8" radius)
circle
Garden (6×4)
triangle
Area Formulas
Rectangle
Area = length × width
Perimeter = 2 × (length + width)
Circle
Area = π × radius²
Circumference = 2 × π × radius
Square
Area = side²
Perimeter = 4 × side
Triangle
Area = (base × height) ÷ 2
Perimeter = sum of all sides