How to Make a Cone Out of Cardboard

Many items come in conical shapes.
Many items come in conical shapes. (Image: hats image by Alexey Stiop from

A cone is a three-dimensional shape that tapers from a flat, circular base up to a pointed apex. Making your own cone can serve myriad purposes, from educating young children on geometric shapes to building part of a model to creating a costume accessory. All you need is a light, thin piece of cardboard, such as the side of a cereal box, and a few simple items found in most houses.

Things You'll Need

  • Recycled cereal box
  • Scissors
  • Duct tape
  • Pencil

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Open a recycled cereal box, gently pulling at the seams until you have a flat piece of cardboard.

Draw a large isosceles triangle onto the plain side of the cardboard with a pencil. Make the two equal sides straight lines and the third side curved. Your triangle will look like a wedge-shaped piece of pie.

Cut out the triangle along the pencil guidelines.

Shape the cardboard triangle into a cone by slightly overlapping the equal sides and taping along the seam with duct tape.

Tips & Warnings

  • Use a big piece of poster board to make a megaphone that you can bring to sporting events. Paint your school letters on it. The poster board and letters should be in the colors of your school.
  • Use the cone as your base for a papier mache mountain, or several cones for a mountain range. For a model, attach the mountains to a thick cardboard platform and cover it with cotton so it looks like snow.
  • Make a tall cone out of pink poster board, then attach a thin strip of pink tulle to the top and decorate with glitter glue to create a princess hat.


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