Please download the Microsoft Excel – Fertilizer calculator for agriculture.
The University of Georgia and University of Kentucky also have different types of fertilizer calculators, you may wish to try.
For Landscape lime and fertilizer math, please see this presentation as a pdf
For manure or litter application help, please see the worksheets below. Both are them are by Dr. Shawn Hawkins and Dr. Forbes Walker
Poultry litter application worksheet
Dairy manure application worksheet