FREE MATH TOOL

Area Calculator

Use this free area calculator to calculate the area of common shapes including rectangles, squares, circles, and triangles. Select a shape, enter the required values, choose a unit, and get the area instantly.

Calculator Inputs

Choose a shape and enter values

Formula Preview

Result Summary

Formula
Calculation
Readable Result

How to use

  1. Select a shape.
  2. Choose a unit.
  3. Enter the required values.
  4. Click Calculate.
  5. View the area result.

Area formulas

  • Rectangle: Area = Length × Width
  • Square: Area = Side × Side
  • Circle: Area = π × Radius²
  • Triangle: Area = 0.5 × Base × Height

Supported shapes

This first version supports rectangles, squares, circles, and triangles. Each shape shows only the input fields needed for that formula.

Supported units

You can calculate area from millimeters, centimeters, meters, kilometers, inches, feet, and yards. The result is shown in the matching square unit, such as m², ft², or yd².

Result explanation

The result summary shows the main area, the formula used, the exact calculation, and a readable square-unit result. When Meter is selected, the calculator also shows hectares and acres for quick land-area reference.

Math tool note

This is a simple Math Tool for shape area formulas. It is not a GIS coordinate area calculator and does not calculate geodesic, projected, or map-based polygon areas.