Feebas Odds Calculator (Gen III Style)
Use this calculator to estimate your chance of finding Feebas while checking unique fishing tiles (like Route 119 in Ruby, Sapphire, and Emerald).
Tip: Route 119 is commonly modeled with 447 fishable tiles and 6 Feebas tiles.
What this Feebas calculator does
Feebas hunting can feel random, but the odds are predictable when you break the process into parts. This tool estimates your probability of success based on:
- How many water tiles exist in the area
- How many of those are Feebas tiles
- How many casts you make per tile
- Your expected encounter chance on a true Feebas tile
- How many unique tiles you plan to test
Instead of guessing whether your route is “good” or “bad,” you can decide a strategy using hard numbers.
How the math works
Step 1: Detection per tile
If a tile is truly a Feebas tile and each cast has probability p of an encounter, then making c casts gives detection chance:
Detection = 1 - (1 - p)c
So, if p = 50% and c = 3 casts, detection chance is 87.5% on a real Feebas tile.
Step 2: Overall hunt success across many tiles
When you check unique tiles, you might hit 0, 1, 2, or more Feebas tiles. The calculator uses a combinatorial model (hypergeometric distribution + detection chance) to compute the exact probability of finding at least one Feebas in your planned search.
This is more accurate than a rough independent approximation, especially when tile counts are limited.
Recommended use pattern
- Set your map values (or keep Route 119 defaults).
- Pick casts per tile based on patience and rod speed.
- Set a tile budget you can realistically check in one session.
- Use the target confidence output to choose when to stop.
If your confidence is still low after a long session, the calculator can justify whether to continue, reset conditions, or revisit after tile changes.
Practical Feebas hunting tips
1) Be systematic
Move in a pattern (row-by-row or bank-to-bank). Random movement causes duplicate checks and can quietly destroy your real odds.
2) Track checked tiles
Use a simple notepad or screenshot markup. Unique tiles matter; repeated casts on already-cleared non-Feebas tiles do not improve tile coverage.
3) Tune casts per tile to your goal
More casts per tile raises detection on true Feebas tiles, but lowers total tile coverage per hour. Use this calculator to balance depth (casts) vs breadth (tiles checked).
4) Know your game version behavior
Feebas mechanics differ across generations and remakes. This calculator is best for a classic “hidden Feebas tile” model like Gen III route hunting.
Quick FAQ
Is this only for Route 119?
No. You can model any map as long as you know or estimate total fishable tiles and Feebas tile count.
Why include encounter chance per cast?
Because even on a true Feebas tile, each cast may not trigger Feebas. Multiple casts increase certainty on that tile.
What confidence should I target?
Most players use 80% to 95%. If you want consistency with limited frustration, 90% is a practical target.
Bottom line
Feebas hunting feels chaotic, but the odds are manageable once you quantify your plan. Use the calculator before your session, set a confidence target, and fish with a clear strategy instead of pure luck.