Uma Musume Affinity Calculator
Check compatibility and aptitude bonuses between parents to boost inheritance spark rates.
The Uma Musume Affinity Calculator measures the compatibility between two parent Umas (and their shared history). Higher affinity increases factor spark rates during inheritance, so a high-compatibility pairing passes down stamina, aptitude and skill factors far more reliably. Use it before breeding to pick parents that maximise your inheritance odds.
Key Facts
- Higher affinity directly increases factor spark rates
- Compatibility comes from shared races, groups and appearances
- Best paired with the inheritance calculator for full breeding planning
- Turns "good factors" into "reliably inherited factors"
- Essential for efficient stamina and aptitude breeding chains
Great parents, terrible sparks
You line up two strong parents with the stamina factors you need, breed them, and still get almost nothing. The missing piece is affinity: low compatibility quietly tanks your spark rate, and the game never shows the number. You blame RNG when the pairing was the problem.
Pick pairs that actually spark
This calculator rates a pairing's affinity from shared races, groups and appearances, then shows how that affinity lifts your inheritance odds. Combined with the inheritance calculator, it lets you choose parents that both carry the right factors and share high compatibility β the two ingredients of a reliable stat engine.
What affinity is
Affinity (compatibility) reflects how connected two Umas are through shared history in the game world. It acts as a multiplier on inheritance: the same factors spark much more often on a high-affinity pairing than a low one, which is why two "perfect" parents can still disappoint.
Using affinity with inheritance
First find parents that carry the factors you want with the inheritance calculator, then check their affinity here. If it is low, look for an alternative parent with similar factors but better compatibility. High factors plus high affinity is the goal.
Frequently Asked Questions
What is affinity in Uma Musume?
Affinity, or compatibility, is a hidden value between two parent Umas based on shared races, groups and appearances. Higher affinity raises the chance that factors spark during inheritance.
Does affinity increase stats directly?
Not directly. It increases the odds that stat, aptitude and skill factors are inherited, which raises the child's stats indirectly and reliably.
How do I raise affinity between two parents?
Choose parents that share races, belong to related groups, or have appeared together. The calculator estimates the resulting compatibility so you can compare pairings.