REFERENCE / FIELD NOTES
How this Pokemon IV Calculator handles rounding and uncertainty
A visible stat is the end of several integer steps. The calculator does not reverse one simplified equation and pretend the answer is unique. It generates legal hidden-value candidates, runs the selected generation's formula forward, and keeps only candidates that reproduce every observation and optional in-game clue.
Modern IV calculation in Generations 3–9
For HP, the game combines twice the base stat, the 0–31 IV and floor(EV/4), scales the sum by level, then adds the level and 10. Other stats add 5 after the level calculation and only then apply the Nature multiplier. Because each stage is rounded down, several neighboring IVs often produce the same number at a low level.
The Nature selector contains the real 25 Natures, including five neutral Natures. It never treats “+Attack” as a complete Nature because a stat-raising Nature also lowers another stat unless it is neutral.
Why a second level observation helps
One Level 5 or Level 20 stat can represent a wide IV interval. A second reading at another level changes the rounding boundary, so intersecting both readings often removes candidates. The readings must describe the same Pokémon with the same EVs, Nature and form. Leveling through battles can add EVs and invalidate that assumption; a Rare Candy or controlled level change is safer.
You can add up to five readings. More readings do not automatically make an answer correct: one mistyped stat creates a conflict, and the diagnosis names the affected stat instead of silently returning a fabricated result.
Known EVs versus unknown EVs
Known mode uses the exact EV count you enter and checks the 252 per-stat and 510 total limits. Unknown mode tests every legal stat contribution that can remain unchanged across all readings. Since the formula uses floor(EV/4), EV values such as 4, 5, 6 and 7 are indistinguishable from the visible stat alone.
The result therefore reports candidate IVs together with an EV interval. Unknown mode also removes a candidate when its minimum EV requirement cannot fit beside the minimum requirements of the other five stats under the 510 total cap.
Generation 1 and 2 use DVs and Stat Experience
The first two generations use 0–15 DVs. Their training contribution comes from Stat Experience through floor(ceil(sqrt(Stat Experience))/4), with a maximum contribution of 63. Generation 1 has one Special stat. Generation 2 has separate Special Attack and Special Defense base stats, but both visible stats share one Special DV and one Special Stat Experience value.
HP is also linked to the other stats: its DV is assembled from the lowest bit of the Attack, Defense, Speed and Special DVs. The calculator enforces those parity combinations globally, so an HP reading can rule out otherwise valid-looking individual DV ranges.
Characteristic and Judge clues have limits
A Characteristic points to a stat that can be tied for the highest IV and reveals the IV remainder modulo five. If several stats share the highest IV, a hidden personality value chooses which tied stat supplies the phrase. This tool keeps combinations that could produce the selected phrase; it does not claim to recover that hidden tie order.
For Generation 7 and later, the optional Judge filters use the modern per-stat ranges: No Good 0, Decent 1–15, Pretty Good 16–25, Very Good 26–29, Fantastic 30 and Best 31. Earlier game-specific judge sentences are not simulated.
Shedinja and other calculation boundaries
Shedinja always has 1 HP in the modeled summary screen, so HP cannot reveal its IV or EV. The calculator still validates that the observed HP is exactly 1. It uses historical base-stat patches where available, including the Generation 1 Special stat and later official stat changes.
The calculation does not include in-battle stat stages, held items, Abilities, status conditions, Dynamax HP, temporary transformations or other battle modifiers. Choose the form and copy the permanent summary-screen stats before battle.
Which IV calculator rules should I use for FireRed, Emerald, Gen 4, or Gen 9?
Version-specific searches usually map back to a generation ruleset. For Pokémon FireRed, LeafGreen, Ruby, Sapphire, and Emerald, choose Generation 3. Diamond, Pearl, Platinum, HeartGold, and SoulSilver use Generation 4; Black, White, Black 2, and White 2 use Generation 5. Scarlet and Violet use Generation 9. The core 0–31 IV stat formula is modeled under the selected generation while the page also applies the historical base-stat data available for that Pokémon and form.
This is a main-series Pokemon IV calculator, not a Pokémon GO IV calculator. Pokémon GO uses a different stat model, appraisal system, CP calculation, and 0–15 Attack/Defense/HP IVs, so entering GO values here would answer the wrong question. If your search includes “Pokemon GO,” use a tool built specifically for GO rather than forcing those numbers into the main-series formula.
Results stay on your device
The local Pokédex, historical base stats and candidate search run in the browser. The calculator stores your latest state in versioned local storage so a refresh can recover it. Nothing is uploaded by the calculator. A share link is created only when you press the share button, and its URL contains the selected state.
Use Copy Summary when you need a readable record without exposing every input in a URL. Reset clears the saved calculator state after confirmation.
How to read an exact, narrowed or broad result
Exact means one IV or DV remains for every inferable stat. Narrowed means at least one stat has a small candidate set. Broad means the observations are valid but still permit many hidden values. A broad result is not an error; it means the visible information is insufficient.
A conflict means no legal candidate reproduces all inputs under the selected rules. Check the Pokémon form, generation, Nature, level, EV or Stat Experience assumptions and copied stats before adding more observations.
Pokemon IV Calculator FAQ
Why does the Pokemon IV calculator return an IV range instead of a single number?
At low or mid levels, multiple individual IV values round down to the exact same visible stat integer. You can narrow the candidate range by inputting a second observation at a different level, specifying known EV values, or using the in-game Characteristic and Judge labels.
Can I calculate IVs accurately when EVs are completely unknown?
Yes, Unknown EV mode tests every legal EV contribution that satisfies all stat readings while remaining within the legal 510 total EV cap. While several exact EV values can produce the same stat boost, adding another level reading without battling eliminates impossible combinations.
How does Generation 9 Scarlet and Violet Hyper Training affect IV calculation?
Hyper Training with Bottle Caps changes a Pokémon's effective combat stat to match a 31 IV, but the underlying natural IV remains unchanged for breeding purposes. The judge label will read Hyper trained! instead of Best, meaning the original inherited IV must still be calculated from pre-trained stats.
What is the difference between classic DVs and modern IVs in Generations 1 and 2?
Generations 1 and 2 use 0 to 15 Diversification Values (DVs) and Stat Experience rather than modern 0 to 31 IVs. In addition, Generation 1 shares one Special stat, while HP DV is deterministically calculated from the odd/even parity of the other four stats.
Why are 0 Attack and 0 Speed IVs considered optimal for competitive play?
A 0 Attack IV minimizes damage taken from enemy Foul Play and self-inflicted confusion damage on special attackers. A 0 Speed IV guarantees moving first under Trick Room and ensures moving last with slow pivot moves like U-turn or Teleport.
Does a Characteristic clue always point to the single highest IV?
A Characteristic identifies a stat that ties for the highest IV and indicates that IV modulo 5. When multiple stats share the same highest value (such as across all 31 IVs), a hidden personality value decides which stat's phrase is displayed.
Why can Shedinja's HP IV not be calculated from its visible stat?
Shedinja always possesses exactly 1 HP regardless of level, HP IV, or EV investment. Because the HP stat is fixed by game code, it provides zero mathematical feedback to differentiate candidate IVs.
How do Judge phrases translate to exact IV numbers in modern games?
In Generations 7 through 9, the in-game Judge displays: No Good (0), Decent (1–15), Pretty Good (16–25), Very Good (26–29), Fantastic (30), and Best (31). Entering these labels into our filters instantly eliminates invalid candidates.
Are my Pokémon stats or calculations uploaded to an external server?
No, all candidate searches, historical base stat lookups, and formula calculations run entirely within your web browser. Share URLs are generated client-side and store your inputs locally without transmitting private data.
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