theBExperTs offer services that are quite straightforward to use. There are currently two (2) calculators, namely "BExperT" and "Marginator", each for a specific use. To view more details for each of them, click the equivalent plus (+) sign button of the following panels.
In case you want to directly move to a calculator, simply click the link button on the right side of the equivalent panel.
BExperT is quite straightforward to use. You simply have to select the parameters of your query via a series of drop-down menus. In particular,
* "Team" is obviously not a choice when you select "According to odd" as a Query Type
** when "According to odd" is selected as Query Type, then this drop-down converts to "Home, Draw or Away"
*** all odds should be given in decimal format (e.g. 1.80, 2.7, etc)