Free Uma Musume Inheritance Calculator – Optimize Factors, Compatibility & 9★ Parents

What Is the Uma Musume Inheritance Calculator?

The Uma Musume inheritance calculator is a planning tool that lets you input your current trainee and potential parents (and sometimes grandparents) to estimate:

• Overall compatibility between your trainee and each parent.
• How likely you are to roll 3★ blue stat factors (Speed, Stamina, Power, Guts, Intelligence/Wisdom).
• The distribution of aptitude factors (distance, surface, running style).
• Which skills and unique factors are most likely to pass down.
• Which parent combinations are more efficient for building future 9★ parent stock.

You do not need the calculator to play the game, but you do need it if you want to:

• Stop wasting育成 on bad pairings.
• Stack multiple generations of good factors efficiently.
• Minimize “dead” factors that do nothing for your target race plan.
• Prepare specialized runners for Champions Meetings or competitive PvP.

Think of the inheritance calculator as your “breeding spreadsheet on autopilot.” It organizes everything you would otherwise have to track manually:

1. Which parents have which factors.
2. Which grandparents support those parents.
3. How all those pieces interact to produce a new trainee.

With a good calculator, you move from “I hope this works” to “I know why this build should produce strong results, and I know what to fix when it doesn’t.”

Understanding Inheritance in Uma Musume

Before you can use any calculator effectively, you need a firm grasp of how inheritance actually works in Uma Musume. The game never fully explains the math, but the community has reverse-engineered enough of it to make planning possible.

What Is “Inheritance” in Uma Musume?

Inheritance is the process that happens when you start育成 with a new trainee. You choose two parents (commonly called Parent 1 and Parent 2), each of which also has two grandparents in their history. The game then:

• Evaluates the factors of parents and grandparents.
• Rolls blue stat factors based on final育成 stats and previous inheritance results.
• Checks aptitudes (distance, surface, style) for improvement or reinforcement.
• Picks certain skills or unique abilities for possible inheritance.
• Applies scenario factors if relevant (URA, Aoharu, etc.).

The final result is your new Uma Musume with a set of factors visible on her profile. These factors will influence all of her future育成 runs and how she performs in the races you care about.

Why Factors Matter So Much

Factors are not cosmetic. They directly impact:

• Starting stats at the beginning of育成.
• Bonus stat gains when inheritance events trigger mid-育成.
• Aptitude ranks (e.g., going from B to A on Medium distance).
• Skill availability – you may see certain skills more often as options.

In competitive content, the difference between a horse with random factors and one with stacked, coherent factors can be the difference between:

• Starting育成 with +60 Speed vs. +10 Speed.
• Reaching S+ on your main stat vs. being stuck at A+.
• Having perfect A/S aptitudes vs. fighting with B or C ranks.
• Having access to key gold skills vs. missing them repeatedly.

This is why serious players treat inheritance planning as seriously as support card selection or turn-by-turn 育成 decisions.

The Role of Parents and Grandparents

Each new trainee has:

• 2 direct parents (P1 and P2).
• 4 grandparents (P1’s parents + P2’s parents).

All six of these ancestors contribute to:

• Total factor pool (how many blue, pink, green factors are available).
• Compatibility score (how “aligned” the lineages are).
• Potential stat bonuses and aptitude improvements.

Most beginners only look at the two parents and ignore grandparents entirely. The calculator forces you to see the full picture: if the grandparents are bad, it is almost impossible to create truly elite 9★ lines.

Factor Types: Blue, Pink, Green & Scenario Factors

Not all factors are equal. A strong inheritance plan balances the different factor types instead of blindly chasing random 3★ rolls. Here is how each type works and why it matters.

Blue Factors – The Core Stat Boosters

Blue factors are the most famous and most coveted:

• They represent primary stats: Speed, Stamina, Power, Guts, Wisdom/Intelligence.
• They come in ★ levels: 1★, 2★ or 3★.
• 3★ blue factors significantly boost that stat at inheritance and may increase stat cap potential.

A typical 9★ parent will have some combination such as:

• Speed 3★
• Stamina 3★
• Power 3★

or:

• Speed 3★
• Wisdom 3★
• Scenario 3★ (in some builds)

Blue factors come primarily from:

• The final育成 stats of a parent when that parent was trained.
• How well that parent performed during育成 and races.
• Randomness, constrained by the parent’s stat distribution and scenario.

In short: if you want 3★ Speed factors, you must actually finish育成 runs with very high Speed on the parent.

Pink Factors – Distance, Surface & Running Style Aptitudes

Pink factors (sometimes called aptitude factors) influence:

• Distance: Short, Mile, Medium, Long.
• Surface: Turf vs. Dirt.
• Running Style: Leader, Runner, Chaser, etc.

These factors determine how easy it is to raise aptitudes to A or S and whether you can convert a naturally Turf-oriented horse into a Dirt specialist or a Medium distance star into a Long distance monster.

For Champions Meetings and any targeted race, pink factors matter almost as much as blue factors, because a horse with perfect stats but C aptitude on the race distance will underperform compared to a properly tuned runner with A or S.

Green Factors – Skills & Unique Traits

Green factors are typically skill-related. They might represent:

• Gold skills your parent used.
• Useful race skills (e.g., acceleration, cornering, recovery).
• Unique skills (固有) from certain Uma Musume.

While green factors are less “visible” than blue factors, they can:

• Increase the chance you see key skills as options during育成.
• Lower the cost of purchasing certain skills.
• Support very specific strategy builds (e.g., end-race burst skills in a certain lane).

Scenario Factors – URA, Aoharu, and Others

Scenario factors are linked to the育成 scenario (for example, URA Finals or Aoharu). They can:

• Boost specific stats (often Speed or Power).
• Give broad advantages to育成 runs in the same scenario.
• Act like an extra pseudo-blue factor in some lineups.

Many 9★ builds include one scenario 3★ factor plus two stat 3★ factors, especially if the scenario offers powerful bonuses that align with competitive metas.

Compatibility Explained (And Why It Matters)

Compatibility is one of the most misunderstood elements of inheritance. Many players ignore it because it is not fully explained in-game, but it has a direct impact on how reliable your inheritance results are.

What Is Compatibility?

Compatibility is essentially a hidden “synergy score” between:

• Your trainee.
• Parent 1 and its grandparents.
• Parent 2 and its grandparents.

The more overlap and coherence in traits across this six-horse family tree, the higher the compatibility.

What Influences Compatibility?

While the exact internal formula is complex, compatibility tends to increase when:

• Horses share the same distance specialty (e.g., all Medium-distance oriented).
• They prefer the same surface (Turf or Dirt).
• They use the same or compatible running styles (e.g., all Leaders or Runners).
• They share scenario or race history similarities.
• Certain characters share lore or “story” connections that the game rewards.

In practice, if you build a family tree focused on:

• One main distance category.
• One main surface type.
• Coherent running styles.

your compatibility score tends to be significantly higher.

How Compatibility Affects Inheritance

High compatibility:

• Increases the chance that useful factors (especially blue and scenario factors) actually trigger.
• Improves the quality of inheritance events during育成.
• Makes it easier to consistently produce strong trainees instead of occasional outliers.

Low compatibility does not make it impossible to get good rolls, but it:

• Increases the randomness of which factors appear.
• Reduces the probability of focusing your boost on the stats you care about.
• Often leads to many育成 runs that feel “dead” despite good parents.

Using the Calculator to Target High Compatibility

A good inheritance calculator will show a numerical compatibility score or at least a rating like Bad / Normal / Good / Great for each parent. You can use that to:

• Compare multiple candidate parents for the same trainee.
• See how changing one grandparent improves the entire tree.
• Identify “core” Uma Musume that connect well with many others.

Over time, you will begin to recognize certain pairings that keep appearing because they simply work better from a compatibility perspective.

The Goal: Building Reliable 9★ Parent Lines

When players talk about “9★” in Uma Musume, they usually mean a parent with:

• Three 3★ factors, typically:
  • 3★ Speed + 3★ Stamina + 3★ Power, or
  • 3★ Speed + 3★ Wisdom + 3★ Scenario, or
  • Any combination that strongly supports a specific race role.

Creating one 9★ parent is already an achievement. Creating multiple 9★ parents that also have excellent compatibility and aptitudes is where serious inheritance planning shines.

Step 1: Decide Your Target Role

Before you even think about factors, decide what you are building:

• Short-distance sprinter.
• Mile specialist.
• Medium-distance all-rounder.
• Long-distance endurance runner.
• Dirt specialist for certain events.

Every decision afterward – blue factor type, pink aptitude focus, skill factors – should reinforce that role. The inheritance calculator helps by letting you preview if your parent choices are accidentally mixing conflicting roles (e.g., Short + Long).

Step 2: Raise Strong First-Generation Parents

Your first generation of parents is rarely perfect. The goal in this stage is:

• Finish育成 runs with very high relevant stats (e.g., 1200+ Speed for Speed 3★ chances).
• Focus on one or two main stats for each parent to increase 3★ probability.
• Keep aptitudes, surface, and style coherent for future compatibility.

The calculator is useful even here: you can record which first-gen parents end up with promising 2★ factors and which ones have the right aptitudes to become “factor stock” later.

Step 3: Plan Grandparents to Reinforce Key Factors

Once you have a few decent parents, you begin thinking in three generations:

• Grandparents (G1).
• Parents (G2).
• Current trainee (G3).

You want your grandparents to:

• Provide additional copies of the same blue factor (e.g., multiple Speed 3★ across the tree).
• Align aptitudes for distance and surface.
• Contribute scenario or skill factors that match your build.

In the inheritance calculator, you can:

• Load Parent A and Parent B.
• See how their grandparents overlap or conflict.
• Swap in different grandparents to check how the factor distribution and compatibility change.

Step 4: Chain Your Improvements

The path to 9★ is rarely “Parent 1 → Parent 2 → Perfect Child.” More often, it looks like:

1. Create a few solid 2★ or mixed 3★ parents.
2. Breed those parents to create stronger factor combinations.
3. Keep only the very best children as the “next generation” parents.
4. Repeat until you finally roll a 9★ parent with good aptitudes and compatibility.

An inheritance calculator becomes your roadmap in this process:

• You can forecast, “If I combine these two, I have X copies of Speed 3★ in the tree.”
• You can check whether your next generation still aligns with your target distance and style.
• You can avoid random breeding that does not push your lineage forward.

How to Use the Inheritance Calculator Step by Step

Different calculators have different layouts, but the core workflow is usually similar. Here is a general step-by-step method you can apply to almost any Uma Musume inheritance calculator.

Step 1: Enter Your Current Trainee

Start by entering:

• Your Uma Musume name (e.g., Special Week, Tokai Teio, Oguri Cap).
• Her rarity (usually 1★–3★ base rarity).
• Her base stats if requested (Speed, Stamina, Power, Guts, Intelligence).
• Her current aptitudes (distance, surface, style).

Some calculators simply require you to pick her from a list and automatically load this data. Others want you to manually input aptitudes or factors. The more accurate you are here, the better the inheritance predictions.

Step 2: Select Parent 1 and Parent 2

Next, choose two potential parents from your roster. For each parent, you either:

• Select them from a built-in list if the calculator supports saved data.
• Manually enter their factors, aptitudes, and scenario data.

A typical calculator will display for each parent:

• Blue factors (e.g., Speed 3★, Stamina 2★).
• Aptitude factors (e.g., Medium 2★, Turf 1★).
• Skill/green factors and scenario factors.
• Compatibility rating with your trainee.

At this point, you can already see which parent is “better on paper,” but do not decide yet – look at the whole tree.

Step 3: Add Grandparents for Each Parent

Many calculators allow you to specify the two parents of each parent (grandparents for your trainee). Adding this information dramatically improves prediction accuracy.

For each grandparent, enter:

• Key blue factors.
• Aptitude focus (distance, surface, style).
• Scenario or unique factors worth inheriting.

Once all six horses (trainee, 2 parents, 4 grandparents) are filled in, the calculator can compute:

• Total factor counts per stat and aptitude.
• Overlap of important factors (e.g., how many Speed 3★ exist in the entire tree).
• Global compatibility trends (e.g., all are Medium-distance Turf Leaders).

Step 4: Review Compatibility and Factor Distributions

Most calculators will now show:

• A compatibility score per parent.
• A summary of blue factor density (how many chances you have for certain 3★ factors).
• An estimate of how likely you are to inherit useful vs. useless factors.

Use this information to answer questions such as:

• “Am I over-investing in Stamina factors when I really need Speed + Power?”
• “Is my Dirt aptitude coming from only one ancestor, making it unreliable?”
• “Do I have enough continuous Medium-distance coverage to keep compatibility high?”

Step 5: Experiment with Alternative Parents

The real power of a calculator is not the first pairing you test, but the comparisons:

• Swap Parent 2 for another candidate and see how compatibility shifts.
• Change one grandparent to see if the entire tree improves.
• Compare pure Speed-Power parent combinations vs. more balanced Speed-Wisdom builds.

Over time, you will build an intuition for which lineages tend to perform better, and the calculator accelerates this learning by making changes instantly visible.

Step 6: Lock in a Plan and Execute育成

Once you have found a parent combination that:

• Has good or great compatibility.
• Stacks multiple copies of the blue factors you care about.
• Preserves aptitudes and skills that fit your racing plan.

it is time to actually育成 that trainee. During the育成 run, track:

• Whether inheritance events are giving you the expected stat gains.
• Which skills appear for discount or unlock.
• How the final stats line up with your blueprint.

After the run, if the new trainee emerges with upgraded factors, you can return to the calculator and treat her as a future parent in your next cycle, gradually climbing toward your ideal 9★ builds.

Example Lineages & Inheritance Plans

To make all this theory concrete, let us walk through a few example plans you could design inside an inheritance calculator. These are not the only solutions, but they illustrate the logic you should apply.

Example 1 – Medium-Distance Leader Focused on Speed & Power

Goal: Create a Medium-distance Turf Leader with:

• Speed 3★.
• Power 3★.
• Scenario 3★ (e.g., URA).
• Aptitudes: Turf S, Medium A/S, Leader A/S.

Step A – Choose Core Parents
You might choose:

• Parent 1: Tokai Teio with Speed 3★, URA 3★, Medium aptitude factors.
• Parent 2: Oguri Cap with Power 3★, Turf aptitude factors.

In the calculator, you see:

• Excellent compatibility (both Medium, Turf, Leader/Runner styles).
• Multiple Speed and Power 3★ factors among parents and grandparents.
• Strong URA factor presence from Teio’s lineage.

Step B – Align Grandparents
You then pick grandparents who:

• Reinforce Medium distance and Turf.
• Add more Power or Speed factors.
• Do not introduce conflicting aptitudes like Long Dirt builds.

In the calculator, you can now see a dense cluster of relevant factors, meaning your trainee will roll far more useful inheritance outcomes than random ones.

Example 2 – Long-Distance Stamina Monster

Goal: Create a Long-distance horse that never runs out of gas:

• Stamina 3★ + Stamina 3★ (two sources).
• One extra 3★ in Speed or Wisdom.
• Aptitudes focused on Long/Turf and appropriate running style.

You feed into the calculator:

• Parent 1: Special Week with Stamina 3★ and Long aptitude factors.
• Parent 2: Mejiro McQueen with Stamina 3★ and Long/Turf S aptitudes.

Because both parents and grandparents favor Long distance and Stamina, the calculator shows:

• Extreme density of Stamina factors across the lineage.
• Very high compatibility scores.
• Reliable chances to roll multiple Stamina 3★ in each generation.

You might then introduce a Speed-focused grandparent on one side to avoid creating a “slow tank” and ensure your Long-distance runner can also accelerate.

Example 3 – Dirt Specialist Conversion

Goal: Turn a favorite Turf horse into a Dirt specialist for a specific event.

In the calculator, you:

• Select your favorite Turf natural as the trainee.
• Pick parents that both have strong Dirt aptitude factors (Dirt A/S) and pink factors improving Dirt.
• Ensure grandparents are also Dirt-biased instead of mixed Turf/Short builds.

The tool will reveal:

• How quickly you can raise Dirt aptitude from C or D to B/A through repeated inheritance.
• Whether your Dirt focus is diluted by random Turf grandparents.
• Which parent combination gives you the most reliable Dirt inheritance rate.

This is far more efficient than casually pairing with one Dirt parent and hoping the game does the rest.

Advanced Inheritance Strategy & Planning

Once you are comfortable with basic inheritance and the calculator interface, you can begin applying more advanced strategies to squeeze even more value out of your runs.

1. Specializing Parents Instead of Making Them “Perfect”

A common mistake is trying to make every parent good at everything. A more efficient approach is:

• Parent A: Strong Speed 3★ + Scenario 3★, good Medium/Turf aptitudes.
• Parent B: Strong Power 3★ + Wisdom 3★, matching aptitudes.

In the calculator, you can see how these specializations combine to produce children who have:

• Access to multiple 3★ stats while still staying focused on one role.
• High compatibility because aptitudes remain coherent.

2. Building a “Factor Farm” Roster

Advanced players create an entire factor farm – a roster of horses whose main purpose is to provide strong factors for future育成. The inheritance calculator is perfect for managing this because you can:

• Catalog which horses have key 3★ factors.
• Group them by distance/surface roles.
• Plan future crosses to upgrade one farm line after another.

3. Using Scenario Changes Intelligently

As new育成 scenarios are added, new scenario factors appear. A strong strategy is:

• Create at least one powerhouse per scenario with a 3★ scenario factor.
• Use the calculator to see which future trainees should inherit which scenario factor.
• Build flexible parents that can support multiple future meta shifts.

4. Balancing Stats vs. Aptitudes vs. Skills

There is always a trade-off:

• More blue factors may mean fewer aptitudes or key skills.
• More skill factors might reduce pure stat potential.

The inheritance calculator lets you experiment with these trade-offs safely:

• In one build, you prioritize triple 3★ blue factors and accept moderate aptitudes.
• In another, you prioritize pink factors and green skill factors for a very specialized build.
• You compare both setups side-by-side before committing育成 time.

5. Planning Around Meta Races & Champions Meetings

When a new Champions Meeting is announced (distance, surface, weather), advanced players:

• Open their inheritance calculator and filter their factor farm by relevant roles.
• Identify parents and grandparents that match the upcoming conditions.
• Quickly assemble a breeding plan that will produce at least one or two competitive runners in time.

Without a calculator, this process is guesswork; with a calculator, it becomes a predictable, repeatable routine.

Common Mistakes to Avoid When Breeding

Even experienced Uma Musume players fall into certain inheritance traps. Using a calculator reduces these mistakes, but only if you know what to watch for.

1. Ignoring Compatibility Completely

Pairing two random “strong” parents with awful compatibility often produces disappointing children. Always:

• Check the compatibility rating for each parent in the calculator.
• Favor pairings with Good or Great compatibility, even if raw factors look similar.

2. Mixing Opposite Roles in One Lineage

Combining a Short-distance sprinter with a Long-distance marathoner may sound fun, but it:

• Creates conflicting aptitudes.
• Confuses the inheritance system about what to prioritize.
• Often yields mediocre performance in both roles.

The calculator will often reveal this by showing scattered factors and lower compatibility.

3. Overloading on One Stat to the Point of Waste

Yes, stacking Speed is nice. But if your entire lineage is Speed 3★ with no Power or Stamina support, you may:

• Hit diminishing returns where the extra Speed is less impactful.
• Struggle in actual races due to lack of endurance or acceleration.

The calculator’s factor breakdown helps you maintain a rational balance.

4. Never Updating Your Factor Farm

Meta changes, new scenarios, and new characters constantly shift what is optimal. A serious mistake is:

• Clinging to outdated 9★ parents that lack modern skills or scenario factors.
• Ignoring new options that could improve your entire tree.

Use the calculator regularly to integrate new parents into your planning instead of relying on ancient builds forever.

5. Not Recording Successful Lineages

When you finally roll an amazing 9★ parent, write it down or save it properly inside your tool. Too many players:

• Accidentally overwrite a great parent.
• Forget which grandparents led to that successful roll.

A simple log, combined with your inheritance calculator, becomes your personal breeding handbook.

FAQ – Uma Musume Inheritance & Calculators

1. Is inheritance pure RNG in Uma Musume?

No. While there is randomness, the rolls are heavily influenced by:

• Final育成 stats of parents.
• Existing factors in the family tree.
• Compatibility and aptitude alignment.
• Scenario performance and race history.

A calculator cannot remove RNG, but it can stack the deck in your favor.

2. Do I really need a 9★ parent to be competitive?

Not strictly, but 9★ parents:

• Give you much more consistent starting stats and inheritance gains.
• Make it easier to achieve S+ or higher in critical stats.
• Reduce the number of育成 runs wasted on fundamentally weak factor setups.

For casual play, 6★ or 7★ can be enough. For serious Champions Meeting competition, 9★ lines are a huge advantage.

3. Which blue factors should I prioritize?

It depends on your role:

• Short/Mile sprinter: Speed 3★ + Power 3★, plus Scenario or Wisdom.
• Medium all-rounder: Speed 3★ + Power 3★ or Wisdom 3★.
• Long distance: Stamina 3★ + Speed or Wisdom 3★.
• Dirt specialist: Speed 3★ + Power 3★, with strong Dirt aptitudes.

4. How often should I use the inheritance calculator?

Ideally, you should:

• Use it before every major breeding decision.
• Re-check your tree when a new scenario, character, or meta race is introduced.
• Use it whenever you roll a new strong factor parent to see where they best fit.

5. Can a calculator guarantee 9★ results?

No tool can guarantee outcomes in a system that includes randomness. What the calculator does provide is:

• A much higher probability of getting the factors you want.
• A clear understanding of which pairings are a waste of time.
• A structured roadmap instead of blind trial-and-error.

6. Do scenario bonuses affect factor rarity?

Yes, scenario performance and final stats both matter. A strong育成 run that ends with high stats and good scenario completion tends to:

• Increase your odds of rolling 2★ or 3★ blue factors.
• Produce high-value scenario factors usable in many future lineages.

7. Should I focus on skills (green factors) or stats first?

For most players, stats come first. You can:

• Prioritize blue and pink factors until you have solid 9★ parents.
• Gradually layer in green skill factors for specialization once your stat base is reliable.

An inheritance calculator helps you pace this by showing when your tree is “stat-stable” enough to start chasing skill optimizations.

Conclusion: Turn RNG into a Controlled Advantage

Uma Musume inheritance looks chaotic at first glance: blue, pink, and green factors, parents, grandparents, scenarios, skills, compatibility… it is easy to feel that everything is random. But once you start using a free Uma Musume inheritance calculator, a pattern appears.

You realize that:

• Carefully chosen parents and grandparents dramatically improve your odds.
• Compatibility is not a vague concept but a concrete lever you can control.
• 9★ parents are not “miracles” but the result of deliberate, multi-generation planning.
• Every育成 run either pushes your family tree forward or wastes potential – and planning makes the difference.

By understanding factor types, prioritizing coherent aptitudes, and using an inheritance calculator to test parent combinations before you commit, you transform breeding from gambling into strategy. You will still have unlucky runs – that is the nature of the game – but over weeks and months, your overall results will rise sharply.

Whether you are chasing top placements in Champions Meetings or just want to see your favorite Uma Musume crush races with stacked stats and perfect skills, smart inheritance planning is your strongest ally. Use a calculator, treat your factor farm as a long-term project, and your stable will steadily fill with powerful, well-bred runners that perform exactly the way you designed them.