An Uma Musume affinity calculator is a fan-created tool for the mobile gacha game Uma Musume Pretty Derby, developed by Cygames. In this game, players train horse girl characters by pairing them with support cards. The affinity system tracks relationship levels between the main character and support cards, which affects training bonuses and event outcomes. An affinity calculator helps players plan which support card combinations maximize stat training efficiency by simulating expected affinity point gains and identifying optimal training event interactions for competitive races in both story mode and online ranked events.
Uma Musume has an extremely dedicated following in Japan and internationally, with players investing heavily in team building and gachi optimization strategies. Affinity calculators are maintained by the game’s community through platforms like GameWith, Altema, and fan Discord servers. They are updated regularly as new horse girls and support cards are introduced in seasonal banner events. Players use these tools during the gacha planning phase to decide which support cards are worth pulling for based on compatibility with their target horse girl build. Understanding affinity mechanics and using a dedicated affinity calculator is considered essential knowledge for players aiming to compete in high-rank championship divisions within the Uma Musume competitive season.