Hiya! I see forums posted for some old spreadsheets that are no longer available to new players without tracking down a user with their own copy. As such, I developed one for my personal use and decided to share it. Currently it is only set up for Breed Standards, but I hope to update it in the future. 

Features:

Tutorial: You will need to use this.

Manual Calculator and Tracker: For use when you don't know any ideal breed standards yet. Includes a quick min/max BS score calculator for a foal and a table to track new breed standards. 

Breed Standard Reporting: A template is included for you to fill for each ideal breed standard you discover. These details will then be included in calculations. 

Crossbred and Purebred Masterlists: Used in various formulas and dropdowns. More info in the tutorial should you need to add to it, but currently completed up to the Cobblestan's release. Does not include campaigns, but you're welcome to add your own. 

Master Stable: Log all your horses here. Currently only BS is active, but I am working to update someday to make use of the personality, PS, and skill columns. 

Pairing Pro: The feature presentation. Allows you to compare all eligible bachelor(ette)s in your master stable to your ‘active’ horse. Options for pure or crossbreeding. Includes maximum number of each rating (E/G/F/P) as well as probability of each rating, provided you have filled out the ideal breed standard for the foal's breed. It also includes the simple min/max values for the foal like with the manual calculator, so you can use this for breeds that you are still discovering. There is also a lethal FrFr flag for a possibly lethal combination.

Sheepishly I must admit that I'm going off information I've found in the wiki and haven't had a chance to set up my own foal lines yet 😅 If there are any mistakes I've made, please let me know!

Sheet here. You will need to make yourself a copy to use it. Some of the tutorial image may move around a bit upon copying; you can just drag them back into their place.