A good source for online grain (& feed) handling calculators

There can be a lot of math associated with planning for a grain or feed handling system.  Sudenga Industries, who makes equipment for those applications, posts a lot of their common formulas and interactive calculators on a page of their web site called "Sudenga University".  Check it out Sudenga University.  

Here is a list of their current offering of calculators as of July 2017.  I happen to know that they are always adding more though so bookmarking their page might be a good thing.

ONLINE CALCULATORS

• Calculate electric motor horsepower required to drive a hydraulic pump
• Calculate belt length and distance between pulleys
• Calculate Auger RPM
• Convert BPH to TPH (U.S. or Metric)
• Calculate feed density
• Convert cubic feet to tons 
• Calculate feed truck capacity needed to obtain given tonnage