Russian Breeding calculator that shows what levels = what

http://bdobase.info/servant_calc

just click the writing by each gender symbol and choose a horse from the list, ordered by tiers and coloring, then choose the level, finally hit the writing to the right. Results will be displayed below, if you fiddle with the levels a bit you can see how the results change, generally I go with how many pages total, versus how many pages of each tier i get for results and use those as fractions to find a percentage for each result.