How do you calculate type effectiveness for a dual-type Pokémon?

Multiply the two single-type multipliers together. A 2 times hit on a 4 times weakness does not exist, but 2 times 2 is 4 and 2 times 0.5 is 1. The possible results are 0, 0.25, 0.5, 1, 2 and 4, and 0 and 4 can only happen with two types.

Did the type chart change?

Yes, in Generation 6. Fairy was added as an 18th type, and Steel stopped resisting Ghost and Dark. Charts drawn before 2013 are missing Fairy entirely and wrongly show Steel resisting Ghost and Dark, which is why older charts still mislead people.

Does type effectiveness apply to status moves?

No. Type effectiveness only applies to damaging moves. A status move such as Thunder Wave is not weakened by type matchups, although some abilities and immunities still block it.

What does same-type attack bonus have to do with this chart?

Nothing directly. STAB is a separate 1.5 times multiplier applied when the move's type matches one of the user's types. Effectiveness and STAB multiply together, so a same-type super effective hit is 2 times 1.5 equals 3 in total.

Pokémon Type Chart — Full 18-Type Effectiveness Table (Gen 6+)

Read the chart in one direction only

A type chart is always attacking type down, defending type across. “Fire is super effective against Grass” means a Fire move does double damage to a Grass Pokémon. It says nothing about what happens when a Grass move hits a Fire Pokémon — that is a different cell, and in this case it is 0.5×, not 2×.

This asymmetry is the single most common source of wrong answers, because people remember the pairing (“Fire and Grass”) rather than the direction. Everything on this page is directional: you choose the move's type first, then the defender.

Dual types multiply, they do not average

A dual-type Pokémon is not “half resistant and half weak”. The two multipliers multiply:

Electric against Water / Flying → 2 × 2 = 4×
Ice against Dragon / Flying → 2 × 2 = 4×
Fire against Grass / Steel → 2 × 2 = 4×
Surf-style Water against Water / Ground → 0.5 × 2 = 1× — the classic “it is a weakness on paper but it cancels out” case
Normal against Ghost / anything → 0 × anything = 0×

There are only six possible results: 0, 0.25, 0.5, 1, 2 and 4. A single-type defender can never produce 0.25 or 4, so if you see one of those, two types are involved — that is a useful sanity check when you are reading a chart someone else made.

The changes most charts still get wrong

Generation 6 (2013) changed the chart, and a surprising number of charts in circulation predate it:

Interaction	Before Gen 6	Gen 6 onward
Steel defending against Ghost	0.5×	1×
Steel defending against Dark	0.5×	1×
Fairy as a type	did not exist	18th type
Fairy attacking Dragon	—	2×
Dragon attacking Fairy	—	0×

If a chart shows Steel resisting Ghost or Dark, it is at least a decade old. That matters in practice: Steel is one of the best defensive types in the modern game partly because it lost those resistances and gained nothing back — the trade was made to stop Steel being nearly unkillable.

Immunities: the 0× rows

Immunities are the cells people forget, and they lose games. The full set:

Attacking type	Deals 0× to
Normal	Ghost
Fighting	Ghost
Poison	Steel
Ground	Flying
Ghost	Normal
Electric	Ground
Psychic	Dark
Dragon	Fairy

Note that Normal↔Ghost is zero in both directions, which is rare — most immunities are one-way. Electric against Ground being 0× is the one that decides matches: no amount of Thunderbolt will touch a Ground type, and a Ground Pokémon switching in takes nothing at all.

What this chart does not cover

Effectiveness is one multiplier among several. It does not account for:

Abilities that override it — Levitate grants Ground immunity, Water Absorb turns Water into healing, Wonder Guard blocks anything not super effective.
Type-changing moves and abilities — Soak, Forest's Curse, Protean and similar effects change what the chart should be applied to.
Same-type attack bonus (STAB) — a separate 1.5× that multiplies with effectiveness: 2 × 1.5 = 3× total for a same-type super effective hit.
Critical hits, weather, items and stat stages — all separate multipliers applied after type effectiveness.

So “4× weak” is a statement about the type chart alone. The actual damage number depends on all of the above, and a 4× weakness on a Pokémon holding an Occa Berry against a Fire move is not 4× in practice.

The full grid

Attacking types down the left, defending types across the top. 2× means super effective, 0.5× not very effective, 0× no effect, blank means neutral 1×.

Frequently asked questions

Is Fairy weak to Poison or Steel?

Both. Fairy takes 2× from Poison and 2× from Steel, and it is immune to Dragon. Fairy resists Fighting, Bug and Dark, and takes 0.5× from Fire.

Why is Ice such a bad defensive type?

Because it has four weaknesses — Fire, Fighting, Rock and Steel — and resists only itself. On the attacking side it is excellent, hitting Dragon, Flying, Grass and Ground for 2×. That gap between offence and defence is why Ice is common as a coverage move and rare as a defensive typing.

Does a 0.25× hit ever matter?

It is the lowest non-zero result and it requires two resisting types, for example a Fire move into a Water / Rock defender (0.5 × 0.5), or a Grass move into a Fire / Flying one. Watch out for the opposite trap too: two types where one is weak and one resists multiply back to a plain 1×, so a Grass move into a Water / Flying Pokémon does normal damage, not a quarter.

Do these numbers apply to Pokémon GO?

No. Pokémon GO uses its own effectiveness values (1.6× and 0.625× rather than 2× and 0.5×) and changed several matchups entirely. Use this chart for the main series games.

Sources

18-type effectiveness matrix, including the Generation 6 additions and the Steel changes — the games' own type matchup data, cross-checked against the official Pokémon type chart, checked 25 October 2026.
Official site — pokemon.com

Every cell here is computed from one data table rather than typed by hand, and the page's own test suite asserts the immunities and weakness counts. If you find a disagreeing cell, it is a bug — please tell us.