TypeChart

TypeChart is a free Pokemon type effectiveness calculator. Pick one or two types for the defending Pokemon and the chart instantly shows every attacking type as 4x, 2x, 1x, 0.5x, 0.25x or 0x, so dual-type weaknesses and resistances are readable at a glance. It also covers the reverse direction, showing what a chosen attacking type does to every defending combination, which helps when building a team or checking a matchup mid-battle. The reference includes the full type chart, a list of Pokemon by type, and notes on abilities and items that change damage. No account is needed, nothing is installed, and it works in any browser on phone or desktop.