Uma Musume Affinity Calculator

Bond level (also called affinity) measures your relationship with a support card. Once a card's bond reaches 80, it grants a +30% stat boost from that card during training. At bond 100, that same +30% bonus applies plus a hint toward a unique event or skill.

Bond gains typically range from about 5 to 7 points per training session with a given card, depending on event choices and card-specific bonuses. This calculator uses an average of 6 points per session to estimate how many runs you'll need.

A standard training deck holds up to 6 support cards. This calculator lets you add up to 6 cards and track each one's bond level independently.

It's a simple 0–100 composite score this calculator generates from your deck's average bond level and the proportion of cards that have already crossed the bond-80 threshold, giving you a quick read on how well-bonded your current deck is.

Since the +30% stat bonus unlocks at bond 80 and doesn't increase further until 100 (where you only gain a unique skill hint), it's usually more efficient to get more cards across the 80 threshold before pushing any single card to 100 — unless that card's unique skill is especially valuable to your build.

Bond gain per training run isn't perfectly fixed — it depends on event choices, card compatibility, and other in-game factors. This calculator uses a reasonable average to give you a close approximation for planning your training plan.