Foal potential calculator
Enter both parents’ strength and endurance potential, known inheritance traits, and how the parents are related. The tool prints a foal range and the chance of clearing 50, 75, or 100. Status: 1 source.
Calculator
Status: 1 source. Bands below are the only kinship cases this tool will run.
Results appear here. Without JavaScript, use the band table.
| Case | Low | High | Status |
|---|---|---|---|
| Unrelated | -4 | 11 | 1 source |
| Half-siblings / grandparent–grandchild | -8 | 7 | 1 source |
| Full siblings / parent–child | -12 | 3 | 1 source |
| Path | Success | Fee | Status |
|---|---|---|---|
| Town broker | 100% | 100 plus potential bonuses | 1 source |
| Own stallion | 100% | 0 | 1 source |
| Fresh semen | 85% | 10 | 1 source |
| Frozen semen | 70% | 20 | 1 source |
Rule source: Walkthrough Forge breeding guide
Inheritable traits and incompatible pairs
Use this reference alongside the potential estimate. The status column distinguishes the trait list from the precise effects reported by one guide.
| Easy Keeper | Yes | Hard Keeper | Names: 2 sources; exact effects: 1 guide |
| Hard Keeper | Yes | Easy Keeper | Names: 2 sources; exact effects: 1 guide |
| Snacky | No | Names: 2 sources; exact effects: 1 guide | |
| Cuddly | No | Names: 2 sources; exact effects: 1 guide | |
| Neat Freak | No | Mud Lover | Names: 2 sources; exact effects: 1 guide |
| Mud Lover | No | Neat Freak | Names: 2 sources; exact effects: 1 guide |
| Sure Footed | Yes | Injury Prone | Names: 2 sources; exact effects: 1 guide |
| Injury Prone | Yes | Sure Footed | Names: 2 sources; exact effects: 1 guide |
| Good Mom | No | Names: 2 sources; exact effects: 1 guide | |
| Good Inheritance | No | Bad Inheritance | Names: 2 sources; exact effects: 1 guide |
| Bad Inheritance | No | Good Inheritance | Names: 2 sources; exact effects: 1 guide |
| Rebellious | Yes | Energetic; Chill | Names: 2 sources; exact effects: 1 guide |
| Energetic | Yes | Rebellious; Chill | Names: 2 sources; exact effects: 1 guide |
| Chill | Yes | Rebellious; Energetic | Names: 2 sources; exact effects: 1 guide |
For each stat, first truncate the parents’ average to a whole number, then add one of 16 equally likely integers. The linked guide’s calculator uses that truncation rule. Unrelated parents roll from −4 to +11. Half siblings or a grandparent pairing roll from −8 to +7. Full siblings or a parent-and-offspring pairing roll from −12 to +3. Each Good Inheritance adds 2. Each Bad Inheritance subtracts 2. Strength is then clamped to 25–100 and endurance to 20–100. The two stats roll separately, so a double target is the product of the two chances.
A vet test called Test Potential costs 150 coins if you need the real parent numbers. The in-game foal simulator’s top value sits one above the true cap, and it hides inheritance traits that still affect the roll. This page does not invent a kinship penalty outside the three bands above. The breeding page explains fees: broker, own stallion, fresh semen, and frozen semen.
Related guides
Questions
Why might my foal miss this range?
Hidden inheritance traits still affect the result. This estimate only includes the parent values and traits entered above.
Sources
- Walkthrough Forge breeding guide — checked 2026-11-06
- Walkthrough Forge calculator (same source family) — checked 2026-11-06
- Walkthrough Forge traits guide (same source family) — checked 2026-11-06
- Horse Game Database trait reference — checked 2026-11-06