Draw a half circle on construction paper using a compass or a pencil tied to a string. You can use the radius measurements below as a guide. The radius is the distance from the center to the edge of the circle.
Small cone hat (e.g birthday hat) - 6 to 8 inches
Medium cone hat (e.g clown hat, Santa hat) - 9 to 10 inches
Large cone (e.g witch hat or wizard hat) - 11 inches or more
Cut out the half circle.
3Form a cone.
Bring the two ends of the half circle together to form a cone. The more the edges overlap, the smaller the cone. Adjust the size of the cone so that the base fits your head. Make the base a little wider if you plan to add a brim or some "hair".
4Staple at the base.
Staple or tape the cone at the base of the seams. Try on your hat and if necessary, remove the staple or tape and re-adjust the width of the base for a better fit.
5Glue the seams.
When you're happy with how your hat fits, apply white glue along the seams.
6Press at the seams.
Press along the seams from the inside of the cone to glue it in place.
7Remove the staple.
Once the glue dries, remove the staple or tape at the base of the cone.
8Decorate the cone hat.
By adding a few more details, you can turn your plain cone hat into any of these fun hats: