Area Calculator

Find the area of a rectangle, triangle, circle, trapezoid, parallelogram or ellipse in any unit, with conversions to square feet, square meters and acres. Example: a 12 by 10 foot rectangle has an area of 120 square feet, or 11.15 square meters.

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Area & Perimeter Calculator

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Type the problems from this lesson and check each step.

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Shape

Side a: length, base or radius

Side b: width, height or second radius

Side c: second base (trapezoid only)

Unit

How to use the Area Calculator

Choose the shape.
Enter the sides in the same unit and choose that unit.
Press Calculate to see the area in several units.

Formula and method

Rectangle: length x width. Triangle: base x height / 2. Circle: pi x r squared. Trapezoid: (base 1 + base 2) / 2 x height. Parallelogram: base x height. Ellipse: pi x a x b.

Worked example: a 12 x 10 ft rectangle

Step	Result
Area (12 x 10)	120 sq ft
In square yards	13.33 sq yd
In square meters	11.148 sq m
In acres	0.002755

Area formulas

Shape	Formula
Rectangle	length x width
Square	side x side
Triangle	1/2 x base x height
Circle	pi x r x r
Trapezoid	1/2 x (b1 + b2) x h
Parallelogram	base x height
Ellipse	pi x a x b

Square units

Area is measured in square units. 1 square yard is 9 square feet, 1 square meter is 10.764 square feet, and 1 acre is 43,560 square feet.

Frequently asked questions

How do I find the area of a rectangle?

Multiply the length by the width.

How do I find the area of a circle?

Multiply pi by the radius squared.

What is the area of a triangle?

Half the base times the height.

How do I convert square feet to square meters?

Multiply by 0.0929.

What is the difference between area and perimeter?

Area measures the surface inside a shape; perimeter measures the distance around it.

What units is area in?

Square units, such as square feet or square meters.

Sources

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Effortless Math Team

16 minutes ago