PokéBonk Type Chart

The multiplier I am quoting

For each chart value i, the code does r *= i >= 2 ? 1.35 : i === 0 ? 0.5 : i <= 0.5 ? 0.8 : 1. Then the result is clamped between 0.4 and 1.8. A standard “super effective” 2 becomes 1.35. A neutral 1 stays 1. A “not very effective” 0.5 becomes 0.8. An immunity 0 becomes 0.5, not zero.

Dual types apply the conversion separately and multiply. Two weaknesses give 1.35 × 1.35 = 1.8225, clamped to 1.8. Two resists give 0.64. An immunity plus a resist gives the 0.4 floor. The 18-by-18 table below converts every entry in the official types.json; rows are attacking types and columns are defending types. The matchup calculator also handles two defending types.

Why other pages show 2×

The glossary uses conventional effectiveness labels, but the current damage function converts the table before applying it. STAB is separate: the outgoing-hit code multiplies matching-type damage by 1.25, or 1.5625 for Adaptability. The chart omits STAB, items, weather and abilities. Incoming damage applies an additional 0.5–1.6 clamp around effectiveness, so 0.4 and 1.8 here describe the shared effectiveness function, not every final received-damage value.