During annual Sports Turf Managers Association (STMA) conference there are workshops to help ground maintenance staff save time and money for their organizations. One of the more recent "how to" work shops covered field marking strategies without using manufactured field stencils.

Mike Hebrand of Athletic Field Design has developed two formulas for two very common shapes that you'll likely paint on sports fields. The formulas require that you know the traditional measurements of the shapes beforehand and then have string and stakes (and a tape measure) available to layout the dimensions of the stencils before you paint them.

Check out these ellipse and star/pentagon freehand formula descriptions.