Uma Musume Affinity Calculator

An essential tool for optimizing inheritance and achieving Double Circle (◎) compatibility.

Parents’ Information

Parent A

Parent B

What is the Uma Musume Affinity Calculator?

An Uma Musume Affinity Calculator is a specialized tool designed for players of the popular game “Uma Musume: Pretty Derby.” Its purpose is to demystify and estimate one of the most crucial hidden stats in the game: **affinity**. This value, also known as compatibility, directly influences the quality of stat and skill inheritance from parent and grandparent characters to the new Uma Musume you are training. By inputting known values, players can predict their total affinity score and make informed decisions to create a powerful successor. High affinity significantly increases the chances of receiving better stat boosts and more powerful “sparks” during inheritance events.

This calculator helps you move from guesswork to strategy. Instead of hoping for a good inheritance outcome, you can plan for it by choosing parent combinations that yield a high affinity score, ideally achieving the coveted “Double Circle” (◎) rating.

Uma Musume Affinity Formula and Explanation

The total affinity score in Uma Musume is an aggregation of several key components. While the exact in-game formula has hidden complexities, the community has established a highly accurate model. This calculator uses that model to estimate your total score.

The general formula is:

Total Affinity = Parent Affinity + Grandparent Affinity + Compatibility Bonus + Special Bonuses

Here is a breakdown of each variable in the formula:

Description of variables used in the affinity calculation.

Variable	Meaning	Unit	Typical Range
Parent Affinity	The sum of affinity points from Parent A and Parent B with your trainee.	Points	0 – 300+
Grandparent Affinity	The averaged sum of affinity from all four grandparents.	Points	0 – 200+
Compatibility Bonus	A fixed point value based on the ◎, ○, △, or × symbol between the parents.	Points	0 – 51
Special Bonuses	Additional points from factors like parents being from the same race series (e.g., Mejiro).	Points	0 or ~25

Practical Examples

Example 1: High-Affinity Breeding Pair

You are trying to build a top-tier runner and have selected parents with excellent compatibility.

• Inputs:
  • Parent Compatibility: ◎ (Excellent)
  • Parent A Affinity: 151
  • Parent B Affinity: 151
  • All Grandparents’ Affinity: 100 each
  • Same Race Bonus: Checked
• Results:
  • Parental Affinity: 302
  • Grandparent Affinity: 100
  • Compatibility Bonus: 51
  • Special Bonus: 25
  • Total Estimated Affinity: 478 (Strong ◎)

Example 2: A More Modest Breeding Pair

Here, the parents are decent but not perfectly optimized.

• Inputs:
  • Parent Compatibility: △ (Fair)
  • Parent A Affinity: 80
  • Parent B Affinity: 70
  • All Grandparents’ Affinity: 50 each
  • Same Race Bonus: Unchecked
• Results:
  • Parental Affinity: 150
  • Grandparent Affinity: 50
  • Compatibility Bonus: 25
  • Special Bonus: 0
  • Total Estimated Affinity: 225 (○)

How to Use This Uma Musume Affinity Calculator

Using the calculator is straightforward. Follow these steps to get an accurate estimation of your breeding pair’s potential. If you want to improve your {related_keywords}, this is the place to start.

1. Enter Parent Compatibility: Start by selecting the compatibility symbol (◎, ○, △, or ×) displayed in-game between your two chosen parents. This provides the base bonus.
2. Input Parent Affinity Values: For Parent A and Parent B, enter the affinity value you have with your trainee. This is the number next to the pink heart in the game.
3. Input Grandparent Affinity: Enter the affinity values for all four grandparents. If you don’t know the exact value, an estimate is better than nothing. These values contribute to the averaged grandparent score.
4. Check for Bonuses: If your two parents share a special connection (e.g., both from the ‘Mejiro’ family), check the “Same Race/Series Bonus” box.
5. Review the Results: The calculator will instantly update the “Total Estimated Affinity” score and the corresponding symbol. A score above 151 is generally considered ◎.
6. Analyze the Breakdown: Use the intermediate values and the bar chart to see where most of the affinity points are coming from. This can help you identify which parent or grandparent is the weak link in your {related_keywords} strategy.

Key Factors That Affect Uma Musume Affinity

Maximizing affinity isn’t just about picking two strong parents. Several underlying factors contribute to the total score. Understanding these is key to advanced {related_keywords}.

• Base Character Compatibility: Some characters have inherently high compatibility based on their relationships in the story and horse racing history. These pairs start with a higher base value (often ◎ or ○).
• Parental Affinity Score: This is the most direct factor you can influence during training. Raising the affinity (pink heart) with potential parents by racing with them and using them as training partners is critical.
• Grandparent Strength: Don’t ignore the grandparents! A strong set of four grandparents can contribute a significant number of points, sometimes enough to push a ○ pairing into ◎ territory.
• Shared G1 Wins: Having parents and grandparents who have won the same G1 races can provide hidden affinity bonuses. Planning race calendars during your parent-raising runs is an advanced but effective strategy.
• Same Series Bonus: Characters from the same lineage or in-game group (like Symboli, Mejiro, etc.) often receive a flat bonus to their compatibility score.
• Inheritance Loop Planning: Advanced players create “loops” of 3-4 characters with high mutual compatibility, repeatedly breeding them with each other to produce progressively stronger parents. This is a core part of the {related_keywords} endgame.

Frequently Asked Questions (FAQ)

What is a good affinity score in Uma Musume?

Any score over 151 is generally considered excellent, as it grants the ◎ (Double Circle) symbol and maximizes the chance for high-quality inheritance. Scores between 51 and 150 result in a ○ (Single Circle), which is good but not optimal.

How do I find a character’s compatibility (◎, ○, △) in the game?

When you select two parents in the inheritance screen before starting a new training run, the game will display a symbol between them. That symbol is their base compatibility.

Does affinity affect which skills are inherited?

While it doesn’t guarantee a specific skill, higher affinity increases the probability of inheriting more skills and higher-level “sparks” (factors) in general from the entire lineage.

What should I do if I don’t know the exact grandparent affinity?

Make an educated guess. A character used often in winning runs might have an affinity of 100-150. A character that was trained but didn’t perform exceptionally might have an affinity of 50-80. Entering an estimate is more accurate than leaving it at 0.

Why did the calculator give me a ○ result when the game shows ◎?

The in-game symbol only represents the *base* compatibility between two characters. The final inheritance quality depends on the Total Affinity, which includes the individual heart levels with parents and grandparents. Your total score might not have reached the threshold for the best inheritance, even with a ◎ base.

Is there a maximum affinity score?

There isn’t a hard-coded maximum, but scores typically range up to the 400s or low 500s in highly optimized breeding scenarios. The practical limit is determined by the maximum achievable affinity points with each character.

How is this related to the {related_keywords} system?

Affinity is the engine that drives the inheritance system. Without high affinity, even parents with amazing 3-star blue or pink factors may fail to pass them on effectively.

Can I improve a △ (Fair) rating to ◎ (Excellent)?

Yes, it’s possible! If you have extremely high affinity values with the parents and grandparents (e.g., 151+ each), their combined points can overcome a poor base compatibility rating and still push the total score into the ◎ range.

Related Tools and Internal Resources

If you found this calculator helpful, check out our other resources for becoming a top-tier trainer:

• {related_keywords}: A deep dive into the mechanics of inheritance sparks.
• A guide to winning G1 races to boost affinity.
• Character-specific breeding guides.