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Area Calculator

Calculate the area of a rectangle, square, circle, or triangle with just a few inputs.

Choose a shape

All calculations are done in your browser

How to Calculate Area

Area is the amount of space inside a 2D shape. People often search for rectangle area, circle area, triangle area, or square area when planning flooring, paint coverage, tiling, landscaping, and classroom geometry problems.

Area vs. Perimeter

Area measures surface coverage in square units such as m2 or ft2. Perimeter measures the distance around a shape. If you are buying carpet or paint, area matters. If you are fencing a yard, perimeter matters.

Common Questions

How do I calculate area for common shapes?+

Use shape-specific formulas: rectangle l x w, square s squared, circle pi x r squared, triangle 0.5 x b x h.

What units are used for area?+

Area is expressed in square units such as m2, cm2, ft2, or in2 based on your input unit.

What is the difference between area and perimeter?+

Area measures covered surface, while perimeter measures boundary length around the shape.

Can this help estimate flooring or paint coverage?+

Yes. Area estimates are commonly used for flooring, tiling, and surface coverage planning.