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Plan your design using a large-scale map or computer software to get the most accurate circles. Mark on the map the directions you will be flattening, to avoid visible signs of passage (inexperienced circle makers can spoil a design by leaving stripes like a lawnmower would).  Initial access is normally through existing farm tracks and trails - scope these out and note their positions on your map before you begin designing.  Start simple. Consider making your first crop circle from an arrangement of discs in a geometric formation. More advanced curved lines can be created by overlapping partial circular arcs. Some cereal artists spontaneously develop designs once they're in the field.  If you do this, make sure everyone in your group understands what the final image will look like. Use your map to find the exact location of the exact center and stomp with one foot to create a small circle. This smaller circle will be the starting point for all of your measurements. Drive a wooden pole into the exact center of the smaller circle. Make sure you drive it in deeply enough that the pole doesn't wiggle around while you're taking measurements! Attach surveyors tape or a 100-ft rope to the wooden pole and stretch it out as far as you need it to go. This part of the circle is called the radius, or the measurement from the center of the circle to the edge. The surveyors tape (or rope) should be stretched out to a length equaling the radius.  As a reminder, the perimeter of a circle is 2πr, where “π” is approximately equal to 3.14 and “r” is the radius of your circle. For example, if you wanted your circle to be 100 feet around, your radius would be 15.92 feet. If your design needs them, make construction lines by laying rope outlines to shapes. Then flatten circles at the intersection points.

Summary:
Plot your crop circle. Create the center of the crop circle. Measure out your circle.