Free Area Calculator Online

Whether you are calculating the square footage of a room for new flooring, painting a wall, or just solving a geometry homework problem, our free Area Calculator gives you instant, accurate results. We support a wide variety of 2D shapes and both Metric and Imperial units, eliminating the need to memorize complex math formulas or manually convert your measurements.

How to Use the Area Calculator

1. Choose your unit: Select your preferred measurement unit from the dropdown, including Metric (meters, centimeters, etc.) or Imperial (inches, feet, yards, etc.).
2. Select your shape: Choose from a rectangle, square, circle, triangle, parallelogram, trapezoid, ellipse, or sector from the dropdown menu.
3. Enter the dimensions: Input the required measurements (such as length, width, radius, or height) based on the shape you selected.
4. Click "Calculate Area": Our tool will instantly process the math and display the total area accurately formatted in your chosen squared units.
5. Clear and repeat: Use the "Clear" button to quickly reset the calculator for your next measurement.

Common Area Formulas Used

If you want to know the math behind the tool, here is how the area of common shapes is calculated:

• Rectangle / Square: Area = Length × Width
• Circle: Area = π × Radius²
• Triangle: Area = ½ × Base × Height
• Trapezoid: Area = ((Base A + Base B) / 2) × Height