The purpose of the custom rate estimator is to estimate a breakeven custom rate for a tractor or other power unit and up to 3 implements, needed to cover added operating and ownership expenses. A self-propelled combine should be entered as a power unit and the heads as implements with their own effective widths and speeds. The template is designed to cover a situation where the machines are already owned and used in an ongoing farm operation, or for purposes other than doing custom work. It can also be used to estimate a breakeven custom rate you can afford to pay as an alternative to purchasing a new machine.