Area Calculator
Free online area calculator. Compute area and perimeter for rectangles, circles, triangles, trapezoids and ellipses instantly. No signup needed.
Enter every dimension using the same unit.
Understanding Area and Perimeter
Area is the space inside a shape, measured in square units. Perimeter is the distance around a shape. Different shapes have different formulas for calculating area and perimeter.
Common Shapes
Rectangle: length × width. Circle: πr². Triangle: ½ × base × height. Trapezoid: ½ × (base1 + base2) × height. Ellipse: π × semi-major × semi-minor axis. Use our calculator for instant results.
Unit Conversion
Area can be expressed in multiple units. 1 m² = 10.764 ft² = 10,000 cm². Select your preferred unit to see results converted automatically.
Real-World Uses
Calculate room area for flooring or paint. Determine fencing needed for garden. Find pizza slice area. Calculate land area in different units. Perfect for geometry, architecture, and DIY projects.
FAQs
What's the difference between area and perimeter?
Area is the space inside (2D measurement). Perimeter is the boundary length (1D measurement). You need area for flooring, perimeter for fencing.
How do I calculate irregular shapes?
Break irregular shapes into regular shapes, calculate each part, then add together. This calculator covers the most common regular shapes.