relicalc is Ranger's Pokémon math calculation code as a standalone Node (12+) library. It has all the math-y stuff from Ranger without any of that pesky UI nonsense, including:

• Calculating possible damage rolls for a move across all possible IVs.
• Determining possible IVs given the value of a stat at previous levels.
• Calculating experience gained from an encounter.
• Determining possible Hidden Power base damage and type based on possible IVs.
• Building combined type defensive typing tables.

...for all generations including Let's Go¹.

Logo by @limeadenectar.

npm install relicalc

or

yarn add relicalc

The full documentation is available here.

GNU GPU v3

1: Gen 1-2 support is less tested.