Area Calculator (Geometric Shapes) – DataMorph
Calculate the area of geometric shapes online. Free area calculator for circle, triangle, rectangle, trapezoid, and more with step-by-step formulas.
Calculate the Area of Common Shapes
Use this calculator to find the area of a circle, rectangle, or triangle from the dimensions you know. The result is expressed in square units: entering measurements in meters produces square meters, while entering centimeters produces square centimeters.
Formulas used
- Circle: area = pi x radius x radius
- Rectangle: area = width x height
- Triangle: area = base x height / 2
For a triangle, height must be perpendicular to the selected base. For a circle, enter the radius rather than the diameter. The calculation runs in the browser and the displayed result is rounded to four decimal places.
Practical uses
Estimate flooring, wall coverage, garden beds, paper layouts, room dimensions, and other two-dimensional surfaces. Split irregular shapes into smaller rectangles or triangles, calculate each part, and add the results.
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