---
title: "Area Calculator — Circle, Rectangle, Triangle, All Shapes"
description: "Free area calculator for all shapes: circle, rectangle, square, triangle, trapezoid, ellipse, parallelogram. Metric (m², cm²) and imperial (ft², in²). Instant results."
url: "https://worldcalculators.org/calculators/area/"
canonical: "https://worldcalculators.org/calculators/area/"
---

# Area Calculator

Free area calculator for all shapes: circle, rectangle, square, triangle, trapezoid, ellipse, parallelogram. Metric (m², cm²) and imperial (ft², in²). Instant results.

## Quick answer

Area formulas: Circle = πr²  ·  Rectangle = w×h  ·  Triangle = ½×b×h  ·  Trapezoid = ½(a+b)×h  ·  Ellipse = πab. Convert: 1 m² = 10.764 ft².

## Frequently Asked Questions

Area = π × r². With r = 5 cm: area = π × 25 ≈ 78.54 cm². If you only know the diameter, use r = d/2 first.
Area = ½ × (a + b) × h, where a and b are the two parallel sides and h is the perpendicular height.

Source: https://worldcalculators.org/calculators/area/
Markdown mirror of the HTML page. Prefer this URL for RAG; the interactive calculator still lives on the HTML page.