Everyday utility

Area Calculator

Calculate the area of common 2D shapes including rectangle, circle, triangle, square, and trapezoid. Use this Data and utilities tool to enter your numbers, review the result, and understand the key assumptions before making the next decision.

What you get
A focused calculator, clear explanation, common questions, and useful next tools.
Quick intro
Calculator
Result
Explanation
Common questions
Related tools

Calculator tool

How this calculator works
The result depends on the numbers you enter and the assumptions shown below.

Area formulas: Rectangle = l×w; Square = s²; Circle = πr²; Triangle = (1/2)×b×h; Trapezoid = (1/2)(a+b)×h; Parallelogram = b×h.

Review the inputs carefully and treat the output as an estimate. For decisions involving money, taxes, health, law, or security, compare the result with trusted professional guidance when needed.

Frequently asked questions

What is the formula for the area of a circle?

Area = π × r², where r is the radius. The circumference is 2πr. For a diameter d: Area = π × (d/2)².