Area Calculator

Use this Area Calculator to find the area of common two-dimensional shapes and convert the result between common square units.

Area Formulas

• Rectangle: A = length × width
• Square: A = side²
• Triangle: A = ½ × base × height
• Circle: A = π × radius²
• Trapezoid: A = ½ × (base 1 + base 2) × height
• Parallelogram: A = base × height
• Ellipse: A = π × semi-major axis × semi-minor axis

Example

For a rectangular room measuring 12 ft by 9 ft:

Area = 12 × 9

Area = 108 ft²

Important Note

Area is measured in square units. Make sure all dimensions use compatible units before calculating. For irregular spaces, divide the area into simpler shapes and calculate each section separately.

Source

• OpenStax Prealgebra 2e — Geometric Formulas