Pokémon Type Effectiveness Calculator

Why dual types change everything

A Pokémon with two types multiplies weaknesses and resistances together — a Water/Flying type doesn't just inherit both types' matchups separately, the effectiveness stacks. That's why some dual-type combos have brutal 4x weaknesses (Water/Flying takes 4x damage from Electric) while others cancel out entirely. If a matchup seems surprising, it's usually the multiplication, not an error.

Best and worst defensive type combos

Once you multiply two types together, some combinations end up nearly bulletproof and others end up weak to almost everything. Here’s how the math actually shakes out across all 153 possible two-type combinations.

Best defensive typings (fewest weaknesses)

Bug/Steel — only 1 weakness (Fire), resists 8 types, immune to 1
Normal/Ghost — only 1 weakness (Dark), immune to 3 types
Water/Ground — only 1 weakness (Grass)
Poison/Dark — only 1 weakness (Ground)
Ghost/Dark — only 1 weakness (Fairy), immune to 3 types

Worst defensive typings (most weaknesses)

Grass/Ice, Fighting/Rock, Grass/Psychic, Grass/Dark, Psychic/Rock, and Rock/Dark — 7 weaknesses each

A weakness here means any attacking type that hits for 2x or more.

Which dual-type combos have a 4x weakness

53 of the 153 possible two-type combinations take a full 4x hit from at least one attacking type — both types being weak to the same thing multiplies together instead of canceling out. Full list:

Show all 53 combos Hide the list

Combo	4x weak to
Bug/Steel	Fire
Dark/Steel	Fighting
Dragon/Dark	Fairy
Electric/Poison	Ground
Electric/Rock	Ground
Electric/Steel	Ground
Fighting/Bug	Flying
Fighting/Dark	Fairy
Fighting/Dragon	Fairy
Fighting/Poison	Psychic
Fire/Bug	Rock
Fire/Electric	Ground
Fire/Flying	Rock
Fire/Ground	Water
Fire/Ice	Rock
Fire/Poison	Ground
Fire/Rock	Water, Ground
Fire/Steel	Ground
Flying/Bug	Rock
Flying/Dragon	Ice
Grass/Bug	Fire, Flying
Grass/Dark	Bug
Grass/Dragon	Ice
Grass/Fairy	Poison
Grass/Fighting	Flying
Grass/Flying	Ice
Grass/Ground	Ice
Grass/Ice	Fire
Grass/Psychic	Bug
Grass/Steel	Fire
Ground/Dragon	Ice
Ground/Flying	Ice
Ground/Rock	Water, Grass
Ice/Bug	Fire, Rock
Ice/Dark	Fighting
Ice/Fairy	Steel
Ice/Flying	Rock
Ice/Rock	Fighting, Steel
Ice/Steel	Fire, Fighting
Normal/Dark	Fighting
Normal/Ice	Fighting
Normal/Rock	Fighting
Normal/Steel	Fighting
Poison/Rock	Ground
Poison/Steel	Ground
Psychic/Dark	Bug
Psychic/Ghost	Ghost, Dark
Rock/Dark	Fighting
Rock/Fairy	Steel
Rock/Steel	Fighting, Ground
Water/Flying	Electric
Water/Ground	Grass
Water/Rock	Grass

Frequently asked questions

What generation’s type chart is this based on?

The modern chart used from Generation 6 onward — it includes the Fairy type and reflects Steel no longer resisting Ghost/Dark, a rule that changed in Gen 6. If you’re playing an older game (Gen 1-5), some matchups here won’t match what you see in-game.

Does this match Pokémon GO’s type chart?

GO uses the same type relationships (what’s strong or weak against what), but different multiplier values (0.625×/1.6× instead of this chart’s 0.5×/2×) — so the pattern of what beats what is the same, but the exact numbers won’t match GO’s in-game display.

What does 4x/2x/½x/0x actually mean?

Multipliers stack when a Pokémon has two types — each type’s effectiveness against the attack multiplies together, not averages. That’s why some combos take a brutal 4x (both types are weak to the same attack) while others cancel out to a normal 1x or even resist entirely.

Why isn’t STAB (Same-Type Attack Bonus) reflected here?

STAB is a separate 1.5x bonus a Pokémon gets for using a move that matches its own type. This calculator only covers type-vs-type matchups; STAB applies on top of whatever multiplier you see here.

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