What is area and how is it calculated?

Area is the amount of space inside a 2D shape. This tool calculates it instantly using standard formulas like length × width for rectangles, π × r² for circles, and Heron's formula for triangles.

Which shapes does this area calculator support?

7 shapes: Rectangle, Triangle, Trapezoid, Circle, Sector, Ellipse, and Parallelogram — all with accurate, real-time formulas.

How does unit conversion work?

Enter values in meters, centimeters, or feet — results auto-convert to m², cm², and ft². Example: 1 m² = 10,000 cm² = 10.76 ft².

Is this area calculator better than Excel?

Yes! No installation, live formula steps, mobile-optimized, automatic unit conversion, 100% free, and works offline after first load.

Can I embed this calculator on my website?

Absolutely! Copy the full HTML code and embed it on Blogger, WordPress, Wix, or any website — no coding required.

Why are formula steps displayed?

To help students, teachers, architects, and engineers understand exactly how the result was calculated — fully transparent and educational.

Area Calculator: Rectangle, Circle, Triangle, Trapezoid, Ellipse, Sector

Area Calculator – Instant Results with Formulas

Need to calculate rectangle, circle, triangle, or any shape area fast? Just select shape, enter dimensions — get area in m², cm², ft², live formula steps, and unit conversion in ONE click. Works on phone, tablet, PC — no app, no signup, forever free!

What Is Area?

Area is the space inside a 2D shape. Rectangle: length × width. Circle: π × r². Triangle: use Heron’s formula. Example: 30m × 20m room → 600 m². Circle r=10m → 314.16 m².

Exactly What You Get

In 0.2 seconds you receive:

Area (4 decimals) – Final answer in m²
cm² & ft² – Auto unit conversion
Live Formula – Exact math used
Step-by-Step Calculation – Transparent & educational
Unit Support – m, cm, ft, deg/rad
7 Shapes – Rectangle to Ellipse
Mobile Ready – Works everywhere

How to Use

Select shape from dropdown
Enter values (supports m, cm, ft)
Click “Calculate” or auto-update

Why 3M+ Users Love This Over Apps

Feature	This Tool	Apps/Excel
Works on phone	Yes	Sometimes
Live formula steps	Yes	No
Unit auto-convert	Yes	Manual
No download	Yes	Required
Free forever	Yes	Ads/Limits

Supported Shapes & Formulas

Shape	Formula	Inputs
Rectangle	length × width	Length, Width
Triangle	√[s(s−a)(s−b)(s−c)]	3 Sides
Trapezoid	((a+b)/2) × h	Base1, Base2, Height
Circle	π × r²	Radius
Sector	(θ/360) × π × r²	Radius, Angle
Ellipse	π × a × b	Semi-major, Semi-minor
Parallelogram	base × height	Base, Height