Also has a section on how to estimate a rental rate, how to do the calculations
The publication also has a section that shows you how to estimate a machinery rental rate, how to do the calculations. For example, say you want to rent a tandem disk. You start with the custom charge (includes labor, fuel and tractor) which is $12.55 per acre on the average, according to the 2012 survey.
The percent of the custom charge which is for interest, insurance, depreciation and repairs (excluding fuel and labor) is 70% for tillage operations, such as disking. You would use 70% for tillage machines, 80% for planting and harvesting. Multiplying 70% x $12.55 equals $8.79 per acre. That's the rental value of the disk, including the tractor.
To calculate the rental value without the tractor, you take the horsepower times the dollar per horsepower hour rental rate (.25 is the average this year) divided by the number of acres covered per hour. For example, 150 HP x 25 cents (per horsepower hour rental rate) divided by 15 acres disked per hour = $2.50. So the rental value of the implement is $8.79 minus $2.50 = $6.29 per acre.