Area Calculator

Calculate the area of various geometric shapes

Select Shape

Length

Width

Rectangle: Length × Width

Square: Side²

Triangle: (Base × Height) ÷ 2

Circle: π × Radius²

Parallelogram: Base × Height

Trapezoid: (Top Base + Bottom Base) × Height ÷ 2

Rhombus: (Diagonal 1 × Diagonal 2) ÷ 2

Ellipse: π × Major Axis × Minor Axis

Sector: (Central Angle ÷ 360°) × π × Radius²

Ring: π × (Outer Radius² - Inner Radius²)

• Select the geometric shape to calculate

• Enter the corresponding dimension parameters

• Automatically calculate area and perimeter

• Display calculation formulas and steps

• Support decimal input and precise calculation

• Provide quick examples of common shapes

• Area: The size of the plane occupied by a plane figure

• Perimeter: The sum of the lengths of line segments that form a plane figure

• π (Pi): Approximately equal to 3.14159

• Unit Conversion: 1 square meter = 10,000 square centimeters

• Similar Figures: Area ratio equals the square of the similarity ratio