Affinity Calculator for Uma Musume
An expert tool to optimize your breeding and inheritance strategy.
Select the known compatibility level between the two parents. Good is a safe default.
Parent 1 Race Wins
Number of G1 races won by Parent 1.
Number of G2 races won by Parent 1.
Number of G3 races won by Parent 1.
Parent 2 Race Wins
Number of G1 races won by Parent 2.
Number of G2 races won by Parent 2.
Number of G3 races won by Parent 2.
Shared Bonuses
Number of identical G1 races won by both parents (e.g., both won Arima Kinen).
What is Uma Musume Affinity?
In the world of Uma Musume: Pretty Derby, affinity is a critical hidden statistic that governs the success of inheritance during breeding. It represents the compatibility between the two parent characters you select. A higher affinity score directly increases the chances of the child inheriting higher-level factors (blue, pink, and white), receiving larger initial stat boosts, and getting better skills. Achieving a high affinity rating, represented by a double circle (◎), is a primary goal for any serious trainer aiming to create a champion Uma Musume. This affinity calculator uma musume is designed to demystify that process.
Uma Musume Affinity Formula and Explanation
While the exact in-game formula is complex and involves many layers, including grandparents, this calculator uses a widely accepted and powerful model to estimate your affinity score. The core components are Base Compatibility, Race Win Bonuses, and Shared Bonuses.
The simplified formula is: Total Affinity = Base Compatibility + Parent 1 Race Bonus + Parent 2 Race Bonus + Shared G1 Bonus + Same Dorm Bonus
| Variable | Meaning | Unit | Typical Range |
|---|---|---|---|
| Base Compatibility | The inherent relationship score between two characters. | Points | 5 – 35+ |
| Race Bonus | Points earned from winning graded races (G1, G2, G3). | Points | 0 – 100+ |
| Shared G1 Bonus | Extra points for each identical G1 race won by both parents. | Points per race | 5 points per shared win |
| Same Dorm Bonus | A flat bonus if both parents reside in the same student dorm. | Points | 0 or 10 |
Practical Examples
Example 1: High Compatibility Pair
Let’s say you are breeding Special Week (Parent 1) with Silence Suzuka (Parent 2). They have excellent compatibility.
- Inputs:
- Base Compatibility: Excellent (35 points)
- Parent 1 Wins: 8 G1, 4 G2, 2 G3
- Parent 2 Wins: 6 G1, 2 G2, 0 G3
- Shared G1 Wins: 4 (e.g., both won the Tenno Sho Autumn)
- Same Dorm: Yes (10 points)
- Calculation:
- Base: 35 points
- Parent 1 Race Bonus: (8*2) + (4*1) + (2*0.5) = 16 + 4 + 1 = 21 points
- Parent 2 Race Bonus: (6*2) + (2*1) + (0*0.5) = 12 + 2 + 0 = 14 points
- Shared G1 Bonus: 4 * 5 = 20 points
- Dorm Bonus: 10 points
- Total Affinity: 35 + 21 + 14 + 20 + 10 = 100 points (〇 – Circle)
Example 2: Maximizing a Lower Compatibility Pair
Now, let’s use a pair with average base compatibility but who are heavily farmed for race wins.
- Inputs:
- Base Compatibility: Average (15 points)
- Parent 1 Wins: 15 G1, 5 G2, 5 G3
- Parent 2 Wins: 12 G1, 8 G2, 3 G3
- Shared G1 Wins: 8
- Same Dorm: No (0 points)
- Calculation:
- Base: 15 points
- Parent 1 Race Bonus: (15*2) + (5*1) + (5*0.5) = 30 + 5 + 2.5 = 37.5 points
- Parent 2 Race Bonus: (12*2) + (8*1) + (3*0.5) = 24 + 8 + 1.5 = 33.5 points
- Shared G1 Bonus: 8 * 5 = 40 points
- Dorm Bonus: 0 points
- Total Affinity: 15 + 37.5 + 33.5 + 40 + 0 = 126 points (◎ – Double Circle)
For more ideas, check out this Uma Musume breeding guide.
How to Use This Affinity Calculator Uma Musume
- Select Base Compatibility: Start by choosing the known relationship between your two parent characters from the dropdown. If unsure, ‘Average’ or ‘Good’ is a safe starting point.
- Enter Race Wins: For each parent, input the total number of G1, G2, and G3 races they have won during their training careers. More wins mean more points.
- Enter Shared Bonuses: Input the number of identical G1 races both parents have won. This is a powerful bonus. Check the box if they live in the same dorm.
- Calculate: Click the “Calculate Affinity” button to see the results.
- Interpret the Results: The calculator will show you the total affinity score and the corresponding symbol (◎, 〇, △, ✕). The bar chart provides a visual breakdown of where your points are coming from, helping you see which areas to improve.
Key Factors That Affect Uma Musume Affinity
- Character Relationships: The most significant factor. Pairs with strong positive relationships in the story (e.g., rivals, best friends) have the highest base values. This is why our best breeding pairs list is a great resource.
- G1 Race Wins: Winning high-stake G1 races provides the most points. Farming G1 wins on potential parents is a core strategy of inheritance farming.
- Shared G1 Wins: The bonus for winning the *same* G1 race is substantial. Planning parents’ careers to overlap on major G1 targets like the Arima Kinen or Japan Cup is highly effective.
- Grandparent Compatibility: While not included in this simple calculator, the affinity between the parents and their own parents (the grandparents) also adds to the total.
- Total Graded Wins: Even G2 and G3 wins contribute, so a long and successful career is always beneficial.
- Dorm Assignment: A small but easy bonus if you can pair up characters from the same dorm.
- Character Aptitudes: Matching aptitudes (e.g., both parents excelling at ‘Long’ distance) is part of the deeper formula and is reflected in the ‘Base Compatibility’ setting. For more details, see this guide on uma musume stats explained.
Frequently Asked Questions (FAQ)
What is the highest affinity score?
There is no theoretical maximum. While achieving a score over 151 guarantees a double circle, you can continue to stack points for even better inheritance odds. Some dedicated players achieve scores over 200.
Does a double circle (◎) guarantee a 3-star inheritance?
No, it does not guarantee it, but it significantly increases the probability. Affinity boosts the *chance* of inheriting higher-star factors, it doesn’t make it a certainty.
How do I find a character’s base compatibility?
This is usually found through community resources like wikis and dedicated compatibility tools (like the one at gametora). It’s based on their relationships in the game’s story.
Is it better to have high base compatibility or more race wins?
Both are important. A high base compatibility gives you a great starting point, but a pair with average compatibility can easily surpass them if they have dozens of G1 wins between them, as shown in our examples.
Are G2/G3 wins worth it?
Yes. While G1 wins give the most points, the points from G2 and G3 wins add up and can often be the difference between a single circle and a double circle.
Should I use this affinity calculator for every breeding pair?
It’s highly recommended. Using an affinity calculator uma musume like this one helps you plan your breeding strategy and avoid wasting resources on low-potential pairings. Try planning your next season with our race planner tool.
How are the points in this calculator determined?
The points are based on community-tested models that approximate the game’s hidden mechanics. We use a 2/1/0.5 point system for G1/G2/G3 wins respectively, and a strong bonus for shared G1 wins and dorm compatibility.
What is a “Legacy Loop”?
A legacy loop is an older strategy of breeding a small, closed group of high-compatibility characters repeatedly to create powerful parents. While less common now, the principle of using high-affinity pairs remains central to modern breeding strategies.