Total luck multiplier
100% (1×)
Effective chance
1 in 500,000
Per-cast chance
0.0002%
| Catch probability | Casts needed | Estimated time |
|---|---|---|
| 50% | 346,574 casts | 20.1 days |
| 75% | 693,147 casts | 40.1 days |
| 90% | 1,151,293 casts | 66.6 days |
| 99% | 2,302,585 casts | 133.3 days |
Catch odds use the confirmed geometric distribution model. Total: 100% base + 0% rod + 0% passes + 0% enchantment + 0% other boosts.
Calculate your catch probability for any fish in Fish It!. Adjust for luck boosts, rod stats, and casting speed to see your real odds.
How the Formula Works
Geometric Distribution (confirmed from fishit.gg RNG Calculator)
EffectiveChance = BaseChance / (LuckMultiplier / 100)
ExpectedCasts = EffectiveChanceMilestone formulas:
- 50% probability: ExpectedCasts × 0.693
- 90% probability: ExpectedCasts × 2.303
- 99% probability: ExpectedCasts × 4.605
LuckMultiplier stacks additively:
- Base: 100% (always present)
- + Rod Luck% + Game Pass boosts + Enchantment luck + Potions/Totems
Example: Hacker Shark with max luck
- Base: 1 in 500,000
- Element Rod (1111%) + All gamepasses (260%) + Leprechaun II (50%) → Total: 1521%
- Effective: 500,000 / (1521/100) = 1 in ~32,873
- 50% milestone: ~22,781 casts
Rarity Tiers & Base Probabilities
| Rarity | Count | Base Chance Range | Weight | Example Fish |
|---|---|---|---|---|
| Common | 32 | 1 in 2 – 1 in 20 | 0.8 | Azure Damsel (1 in 2) |
| Uncommon | 43 | 1 in 15 – 1 in 150 | 1.0 | Gar Fish (1 in 20) |
| Rare | 24 | 1 in 50 – 1 in 750 | 1.2 | Korean Angelfish (1 in 300) |
| Epic | 17 | 1 in 1,000 – 1 in 4,500 | 1.4 | Dorhey Tang (1 in 1,000) |
| Legendary | 18 | 1 in 4,500 – 1 in 25,000 | 1.6 | Yellowfin Tuna (1 in 7,500) |
| Mythic | 12 | 1 in 50,000 – 1 in 200,000 | 1.8 | Magma Shark (1 in 200,000) |
| Secret | 26 | 1 in 250k – 1 in 3.5m | 2.0 | Hacker Shark (1 in 500,000) |
Luck Boosts (Game Passes)
| Game Pass | Boost | Price | Cumulative |
|---|---|---|---|
| Small Luck | +30% | 50R | 30% |
| Extra Luck | +80% | 245R | 110% |
| Advanced Luck | +150% | 545R | 260% |
Top Rod Luck Stats
| Rod | Luck% |
|---|---|
| Element Rod | 1111% |
| Bamboo Rod | 760% |
| Ghostfinn Rod | 610% |
| Angler Rod | 530% |
| Ares Rod | 455% |
Enchantment Luck Boosts
| Enchant | Effect |
|---|---|
| Leprechaun II | +50% luck |
| Leprechaun I | +30% luck |
| Empowered I | +20% luck + 10% reel speed |
Milestone Formulas
- 50% probability: ExpectedCasts × ln(2) ≈ 0.693 × ExpectedCasts
- 75% probability: ExpectedCasts × ln(4) ≈ 1.386 × ExpectedCasts
- 90% probability: ExpectedCasts × ln(10) ≈ 2.303 × ExpectedCasts
- 99% probability: ExpectedCasts × ln(100) ≈ 4.605 × ExpectedCasts
Features (Planned)
- Select fish from dropdown → auto-fill exact base chance
- Select rod → auto-fill Luck%
- Toggle game pass luck boosts
- Toggle active enchantments
- See milestone probabilities: 50%, 75%, 90%, 99%
- Expected time calculation based on casting speed