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Area Calculator

Calculate the area of rectangles, circles, triangles, and more.

m
m
m

Results

Rectangle Area80
Triangle Area40
Circle Area78.54
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What is Area?

Area is the measure of the surface enclosed by a 2D shape, expressed in square units (m², cm², sq ft). Calculating area is essential in construction, real estate, gardening, painting, and everyday life.

Formula

Rectangle: A = length × width Square: A = side² Triangle: A = ½ × base × height Circle: A = π × r² Trapezoid: A = ½ × (a + b) × h Parallelogram: A = base × height

How to use this Area Calculator?

1. Enter length/base and width/height for rectangles and triangles. 2. Enter radius for circles. 3. See area for all three shapes simultaneously.

Frequently asked questions

How to calculate area of a room in square feet?
Measure length and width in feet. Multiply them. A 12ft × 10ft room = 120 sq ft. To convert sq meters to sq feet, multiply by 10.764.
What is 1 acre in square feet?
1 acre = 43,560 square feet = 4,047 square meters.
How to calculate area of irregular shapes?
Break the shape into regular shapes (rectangles, triangles), calculate each area separately, and add them up.
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