Perimeter Calculator

Select Shape: --Choose a shape-- Square Rectangle Triangle Circle

Side (cm):

Length (cm): Width (cm):

Side A (cm): Side B (cm): Side C (cm):

Radius (cm):

How to Calculate Perimeter

Square

Formula: 4 × side

Rectangle

Formula: 2 × (length + width)

Triangle

Formula: side A + side B + side C

Circle

Circumference Formula: 2 × π × radius

Real Life Uses of Perimeter

• Building fences around gardens
• Measuring running tracks
• Designing rooms and homes
• Construction and architecture

Did You Know?

The word Perimeter comes from Greek words meaning “measure around”.

Frequently Asked Questions

What is Perimeter?

Perimeter is the total distance around a shape.

Is circumference the Perimeter of a Circle?

Yes, circumference is the perimeter of a circle.

About This Free Perimeter Calculator

This online perimeter calculator helps students, teachers, engineers, and architects quickly calculate the perimeter of geometric shapes including squares, rectangles, triangles, and circles.

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