Pokemon Encounter Odds Calculator
Estimate your odds of finding a target Pokémon based on encounter rate and number of attempts. Great for route encounters, fishing chains, grass hunting, and planning farm sessions.
Tip: if you are calculating shiny target odds, use your effective per-encounter chance (for example, target species rate × shiny rate when appropriate).
What this Pokémon encounter calculator does
This tool calculates how likely you are to see at least one target encounter over a session. Instead of guessing whether 30 battles is “enough,” you can make a data-based plan before you start hunting. It is especially useful when your target has a low spawn rate and each reset or route cycle takes time.
With the calculator, you can instantly get:
- The probability of seeing at least one target encounter in your planned attempts.
- The probability of seeing zero encounters (your “miss chance”).
- The average number of attempts expected before your first encounter.
- How many attempts you need for your chosen confidence level (such as 90% or 95%).
- Rough time estimates based on encounters per hour.
How the encounter probability is calculated
Core formula
Each attempt has the same independent chance of success, where p is your target encounter rate as a decimal and n is attempts:
If your target appears 5% of the time, then p = 0.05. Over 50 encounters, your chance of getting at least one target is:
That means even with a solid session, there is still about a 7.69% chance of seeing none.
Attempts needed for a confidence target
If you want to know how many encounters are needed for a specific confidence level c (for example 90% = 0.90), this is the rearranged formula:
This is perfect for session planning when your goal is “I want at least a 95% shot today.”
Quick planning table
Use this as a benchmark before running the calculator with your exact setup.
| Encounter Rate | 50% Chance | 90% Chance | 95% Chance |
|---|---|---|---|
| 1% | 69 encounters | 230 encounters | 299 encounters |
| 5% | 14 encounters | 45 encounters | 59 encounters |
| 10% | 7 encounters | 22 encounters | 29 encounters |
Practical hunting tips
- Track real encounter speed: measure your actual encounters per hour for better time estimates.
- Avoid burnout: break long hunts into planned blocks (for example, 30-minute sessions).
- Know your mechanics: abilities, swarm events, location time windows, and repel tricks can change effective rates.
- Use confidence targets: moving from 90% to 95% can require a lot more attempts—decide if the extra time is worth it.
FAQ
Does this calculator work for shiny hunting?
Yes, as long as you input the correct per-attempt probability. If multiple conditions must happen together, combine them into one effective chance before entering the value.
Why did I miss after “good odds”?
Probability is not a guarantee. A 90% chance still means a 10% miss chance. Over many hunts, results balance out, but any single session can run hot or cold.
Are encounters always independent?
Not always. Some game systems include chains, pity mechanics, or modifiers. In those cases, this calculator gives a useful baseline, but exact outcomes depend on that specific game logic.