Area Calculator - Rectangle, Triangle, Circle & More

Area Calculator

Calculate the area of various 2D shapes for construction, landscaping, or academic projects.

Rectangle Area

Square Area

Triangle Area (Base & Height)

Circle Area

Trapezoid Area

Parallelogram Area

Calculated Area
50.00
Area = w × h

The Practical Guide to Calculating Area

**Area** is the measure of a two-dimensional space enclosed by a boundary. It quantifies how much surface a shape covers and is typically expressed in square units (e.g., square meters, square feet). From planning a garden to buying carpet or painting a wall, calculating area is one of the most practical math skills used in everyday life. This multi-shape calculator provides a fast and reliable way to find the area of the most common geometric figures.

Formulas for Common 2D Shapes

Each shape has a unique formula for its area, based on its specific properties.

Rectangle & Square

A rectangle is a four-sided shape with four right angles. A square is a special type of rectangle where all four sides are equal.

Rectangle Area = width × height
Square Area = side²

Triangle

The area of a triangle is half the area of a rectangle that encloses it. The formula uses its base and perpendicular height.

Triangle Area = ½ × base × height

Note: If you only know the three side lengths of a triangle, you can still find its area using Heron's formula, which is available in our dedicated Triangle Calculator.

Circle

A circle's area is determined by its radius (the distance from the center to the edge) and the constant Pi (π ≈ 3.14159).

Circle Area = π × r²

Trapezoid

A trapezoid is a quadrilateral with at least one pair of parallel sides (called bases).

Trapezoid Area = ½ × (base₁ + base₂) × height

Parallelogram

A parallelogram is a quadrilateral with two pairs of parallel sides.

Parallelogram Area = base × height

Real-World Applications

  • Home Improvement: Calculating the amount of paint, flooring, or tiles needed for a room.
  • Landscaping & Agriculture: Determining the area of a plot of land to calculate seed or fertilizer requirements.
  • Real Estate: Area (square footage or square meters) is the primary metric for pricing and describing property.
  • Engineering & Architecture: Calculating the surface area of components for stress analysis or material cost estimation.

Disclaimer

This calculator is designed for general and educational purposes. For professional construction, architectural, or land surveying projects, always rely on measurements and calculations performed by a certified professional.