University of Illinois at Urbana-Champaign
Office for Mathematics, Science, and Technology Education
College of Education @ University of Illinois

Block Perimeter

Click on the squares between grid lines to place and remove boxes.

After placing a number of boxes, count the edges of each box that are not touching another box. The number of free edges that you count is the perimeter.

The applet automatically calculates the total area and perimeter and displays it below.


We're sorry, your browser does not support HTML5 Canvas...
      • Area:
      • Perimeter:


      • Original Java Applet by Nick Exner (2000)
      • JavaScript+HTML5 Remake by Evan Ramos (2015)

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