The Ultimate Guide to the Uma Musume Affinity Calculator (相性計算)
Welcome, Trainers! In the deep and complex world of Uma Musume: Pretty Derby, victory on the turf is forged not just in training, but in the careful science of breeding. At the heart of this system lies a hidden but all-important mechanic: **Affinity (相性, Aishō)**. A high affinity score is the secret ingredient to creating a champion with explosive stats and powerful inherited skills. Our advanced **Uma Musume Affinity Calculator** is designed to demystify this system, giving you the power to plan your breeding pairs with precision.
What is Affinity and Why is it the Most Important Breeding Mechanic?
Affinity is a numerical score that represents the compatibility between the Uma Musume you are training (the "child") and her two parents. This score directly influences the quality of the inheritance you receive at the beginning of a training run. A higher affinity score leads to a more powerful inheritance, which can be the difference between a mediocre run and a URA Finals victory.
Here's what high affinity directly affects:
- Higher Initial Stats:** A good inheritance provides a significant boost to your Uma's starting stats (Speed, Stamina, Power, Guts, and Intelligence), giving you a crucial head start.
- Better Aptitudes:** High affinity increases the chance of inheriting higher aptitudes (e.g., Turf A, Long Distance A), making it easier to excel in specific race types.
- Inheritance of Skills ("White Factors"):** Most importantly, a high affinity score dramatically increases the chance of inheriting the powerful "White Factor" skills from the parents and grandparents. This is how you pass down coveted skills like "Straight Line Recovery" or unique character skills.
How is Affinity Calculated? The Two Pillars of Compatibility
The total affinity score is a sum of points derived from two primary sources: **Character Relationships** and **Shared G1 Race Wins**. Our calculator automates this entire process based on the characters you select.
1. Character Relationship Bonuses (キャラクター相性)
The world of Uma Musume is rich with lore, friendships, and rivalries based on the history of their real-life racehorse counterparts. The game translates these relationships into affinity points. When breeding, the calculator checks for specific pairings between the child, the parents, and the grandparents.
Here are some examples of high-value relationships:
- Strong Rivalries: Special Week and El Condor Pasa, or Tokai Teio and Mejiro McQueen, have strong rivalries that yield significant affinity points.
- Famous Pairings: Characters like Symboli Rudolf and Tokai Teio (father-son relationship in real life) have a very high inherent compatibility.
- Team Connections: Members of the same in-game team, like Team Spica, often have small bonuses with each other.
- Family Ties: The Mejiro family (McQueen, Ryan, Dober, Palmer) has strong internal affinity bonuses.
Our calculator has a comprehensive database of these relationships. When you select your breeding pair, it automatically cross-references every possible pairing (Child↔Parent, Child↔Grandparent, Parent↔Grandparent, Grandparent↔Grandparent) and adds the corresponding points to the total.
2. G1 Race Win Bonuses (G1レース相性)
The second major source of affinity points comes from the shared G1 race victories between the child and her ancestors (parent and grandparents). This rewards breeding from a line of proven champions.
The rules are as follows:
- For each specific G1 race (e.g., the Japan Derby), the game checks if the **Child** shares that victory with her **Parent**, and her **Grandparents** on that side.
- Points are awarded for each shared victory. For example:
- If the Child and the Parent have both won the Japan Derby, you get a bonus.
- If the Child and a Grandparent have both won the Japan Derby, you get a bonus.
Our calculator's advanced database includes the G1 race history associated with each character's real-life counterpart, so you don't have to input them manually. It automatically finds all the common G1 wins and calculates the total bonus.
How to Use Our Advanced Affinity Calculator
We've designed the tool to be powerful yet simple. Just follow these steps:
- Select the Main Uma (Child): From the top dropdown menu, choose the Uma Musume you are planning to train. You can type in the search box to find her quickly.
- Select the Ancestors for Parent 1: In the "Parent 1" box, choose the Parent, and that Parent's parents (the Child's Grandparents).
- Select the Ancestors for Parent 2: Do the same for the "Parent 2" box.
- Click "Calculate Affinity":** Press the button to run the calculation.
Analyzing Your Results
The tool will present the results in two separate cards, one for each parent, because affinity is calculated independently for each.
- The Affinity Symbol & Score: You will see the familiar in-game symbol (◎, ○, △, or ×) and the total numerical score. Aim for the highest score possible!
- ◎ (Double Circle): 151+ points. The best possible pairing. Excellent inheritance is very likely.
- ○ (Circle): 111-150 points. A good, solid pairing. Good inheritance is likely.
- △ (Triangle): 71-110 points. An average pairing. Inheritance will be okay, but not great.
- × (Cross): 0-70 points. A poor pairing. Avoid if possible.
- The Detailed Breakdown: This is the most valuable part for learning. For each parent, the calculator will list every single source of affinity points, showing you exactly where the score came from (e.g., `Special Week ↔ Silence Suzuka: +15 pts`, `Common G1 Win (Japan Derby): +2 pts`).
Advanced Strategies for Maximizing Affinity
- The "Double ◎" Dream: Your ultimate goal is to find a pairing where both parents have a ◎ affinity with your chosen child. This maximizes the chances of a "blue explosion" inheritance event.
- Focus on One Parent Line: If you can't get a double ◎, focus on making one parent's line as strong as possible. A single ◎ is much better than two △s.
- Use Rental Supports: Don't have the perfect parents? Use the in-game rental system to borrow a friend's powerful Uma with high-factor genes and good affinity.
- Plan Backwards: Don't just think about the immediate parents. Look at your available grandparents. Sometimes, a seemingly weaker parent can lead to a higher affinity score if they have amazing parents (grandparents) who have strong relationships with your main Uma.
Frequently Asked Questions (FAQs)
Does the star level of my parent Uma matter for affinity?
No, the star level of the parent characters does not directly affect the affinity score. Affinity is based purely on character relationships and G1 wins. However, a higher-star parent will have better base stats and factors, which makes the inheritance they pass on more valuable.
Does this calculator work for all versions of the game (JP, EN, etc.)?
Yes, the core affinity mechanics are the same across all versions of the game. The character names in our calculator use the most common English translations for ease of use.
The data for a new character is missing! When will it be added?
We strive to keep our database updated with new characters as they are released and as the community discovers their relationship values. Check back frequently for updates!
Final Words: Breed Smarter, Run Faster
Success in Uma Musume is a marathon, not a sprint. It requires careful planning, deep knowledge, and the right tools. Our **Uma Musume Affinity Calculator** is your key to unlocking the complex but rewarding breeding system. By taking the guesswork out of compatibility, it allows you to focus on what matters most: training a champion destined for victory. Plan your pairings, analyze the results, and may your next inheritance be a triple blue!