If you know how to make a correct and reliable metal roof estimate, you could be earning a nice 5- to 6-figure income every year becoming a professional roofing estimator. The sad part is that even some professionals are not doing it right. You need to learn the basics about making a metal roof estimate so that you can evaluate the accuracy of outside estimates or even run some rough calculations on your own. The essentials are easy to understand and master, and when you know how to assess roof difficulty, and measure roofing area in squares, you'll be able to come up with a fairly accurate figure.