You will need:
Hot glue gun
Circular objects to trace
Step 1: Step 1:Trace a Circle Onto the Cork Board
First find something circular the size that you wish the dartboard to be and trace it onto the cork board. I used this mixing bowl to trace.
Step 2: Step 2:
It should look something like this. Repeat this 3 or more times and cut out the circles.
Step 3: Step 3: Glue Pieces Together
I took three pieces and glued them back to back but the goal is to make the cork board 1 inch or thicker. I recommend hot glue for this step.
Step 4: Step 4: Adding the Bulls Eye
Find the middle of the circle you made and make a small circle for the bulls eye. It should have a radius of 1/2 an inch. Next make another circle surrounding the bulls eye. Most people make this second circle too big so be careful with this step. The last outer circle should be in the midpoint between the second circle and the edge of the board.
Step 5: Step 5: Adding a Back (optional)
You can add a back the the dart board if you would like. I chose to do this so that any darts that missed the board would hit the back and not the wall. I used a flat piece of wood that was roughly and inch thick but and hard material works.