Damage calculator for Generations 1 and 2

Both engines run a chain of integer divisions that truncate at every step. A floating-point calculator that rounds at the end is off by a point or two, and two points often decide the knockout. This one repeats the chain in the order the disassembly runs it.

How this works

Game Move Attacker's level

Attacker Defender

Set the types and stats by hand

Filled from the two species, at the level chosen, with maximum DVs and no stat experience. Change whatever you know about your own Pokémon.

Attacker's type Second type Attack or Sp. Atk Defender's type Second type Defense or Sp. Def Defender's HP

Critical hit

The chain, step by step

Every line is a truncation. This is where calculators part company.