Pick one or two types and see at once what deals 4x, 2x, 1/2x, 1/4x or no damage. Build a team of 6 and check shared weaknesses and attack coverage.
The type chart defines how much damage a move deals depending on the type of the target. There are 18 types today, which gives 324 move-versus-defender pairs: 51 are super effective (2x), 61 are not very effective (1/2x), 8 deal no damage (0x) and the other 204 are neutral. A Pokémon can have one or two types, so there are 171 possible typings (18 single and 153 dual). With two types the multipliers multiply: Fire/Flying takes 2x from Rock because of Flying and 2x because of Fire, which makes 4x, while Ground cannot touch it because Flying is immune. The extremes are 4x and 1/4x, and an immunity beats any weakness. The math has curiosities: none of the 171 typings is free of weaknesses, 53 of them have at least one 4x weakness, and only 7 have a single weakness (Normal, Electric, Normal/Ghost, Poison/Dark, Ground/Water, Bug/Steel and Ghost/Dark). Dark and Steel arrived in Generation 2, Fairy in Generation 6, and the chart has not changed since. In Generation 9, Terastallization swaps the Pokémon's defense for its Tera type; the Stellar type, exclusive to Terastallization, keeps the original defense and so does not appear here. The Team tab adds up the weaknesses of up to 6 Pokémon and marks a move type as critical when it threatens two or more members and none resists. The limits are plain: the tool ignores abilities such as Levitate or Water Absorb, held items, weather, and moves with special rules, such as Freeze-Dry (super effective against Water) and Flying Press (combines Fighting and Flying). The data comes from PokéAPI, at a pinned commit, and is text facts only.
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<a href="https://jkit.tools/en/tools/pokemon-weakness-calculator">Pokémon Type Chart and Weakness Calculator</a>
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The multipliers of the two types multiply. A move that deals 2x to both gives 4x, one that deals 2x to one and 1/2x to the other gives 1x, and an immunity in either type zeroes the damage. That is why Fire/Flying takes 4x from Rock and 0x from Ground.
Tap up to 2 types. Tapping a third one replaces the second.
Types that STAB moves of the chosen types hit for 2x.
Pokémon and Pokémon character names are trademarks of Nintendo. This tool is independent and is not affiliated with or endorsed by Nintendo, Game Freak or The Pokémon Company. It shows text facts only, with no official images, logos or sounds. Effectiveness data: PokéAPI (BSD-3-Clause license), the chart in force since Generation 6.