Pokemon Damage Calculator

Every mainline Pokemon game uses the same core damage formula. At its heart: Damage = ((2 × Level ÷ 5 + 2) × Power × A ÷ D ÷ 50 + 2) × Modifiers, where A is the attacker's Attack or Special Attack, D is the defender's matching Defense or Special Defense, and the final result is rolled 16 ways between 85% and 100%.

The modifier stack is where games are won: STAB adds 1.5× for matching types, super-effective matchups add 2× (or 4× with two weaknesses, 0.5×/0.25× for resistances), critical hits add 1.5×, Sun boosts Fire moves 1.5× while Rain boosts Water moves, and Reflect, Light Screen, and Aurora Veil halve incoming damage from the matching side. Burn cuts physical damage in half, and niche items like Life Orb (1.3×) or Choice Band (1.5×) swing entire benchmarks.

If you want to push the numbers further, pair this tool with our Pokemon Natures guide and the interactive Pokemon Type Chart to understand every multiplier in the formula.

Gen 1 (RBY — you'll also see it mistyped as RYB) plays by different rules, and our Gen 1 mode reproduces all of them. There is no Special Attack or Special Defense — one Special stat powers both offense and resistance — and no abilities, held items, or modern EV training.

Two quirks define RBY damage. First, the random roll spans 217–255 out of 255, so damage ranges are wider than later generations. Second, critical hit chance scales with base Speed: a fast Pokemon like Electrode crits nearly every turn, while slow walls almost never do — and in Gen 1 critical hits ignore stat boost stages entirely, which can make a boosted Pokemon hit weaker on a crit.

Switch the generation selector to RBY and the calculator automatically drops Tera Types, abilities, items, and modern weather, then applies authentic Gen 1 mechanics to every move it lists.

Pokemon Champions brings the VGC Doubles format to a standalone battle game, starting from Regulation Set M-C rules: level 50, Tera Types, and the modern Gen 9 damage formula. The calculator boots into Champions mode with Doubles selected, so spread moves like Earthquake and Dazzling Gleam automatically apply the 0.75× spread penalty.

Load a preset set on either side — Miraidon, Incineroar, Rillaboom, Urshifu, Calyrex riders, and more — to reproduce the benchmarks VGC players check most: does my Chien-Pao guarantee the OHKO on opposing Flutter Mane, and does their Incineroar survive my Ogerpon's Ivy Cudgel after Intimidate?

Because Champions shares Gen 9 mechanics, the SV and Champions modes are identical under the hood — pick whichever matches the game you're playing.

Playing a mainline game on the DesMume emulator and want the calculator to match your save? You have two options: manual sync or automated RAM reading.

Manual sync: open the game's Pokemon summary screen and this calculator side by side. Enter the level and nature first, then copy the stats you see into the EV and IV fields until the calculator's stat readout matches the game exactly. Freshly caught Pokemon start at 0 EVs, so IVs are the only unknown — the calculator settles on the combination that reproduces the in-game numbers.

Automated sync: DesMume runs Lua scripts that read the emulator's memory while you play and can stream live stats, HP, and moves into external tools. Competitive players use these scripts to keep a damage calculator synchronized with a Nuzlocke or randomized run without touching a single input field.

The same manual method works on any platform — Switch, 3DS (via Citra), or original hardware — anywhere you can read the summary screen.

This tool runs on @smogon/calc, the open-source TypeScript engine that powers the official Pokemon Showdown damage calculator — the same move data, item data, ability logic, and generation mechanics the competitive community relies on every day.

On top of that engine we added what Showdown's calculator leaves out: official artwork for every species, one-click VGC preset sets for the Champions format, a mobile-first layout, and tight integration with our other tools — build a team in the Pokemon Team Planner, then pressure-test its damage benchmarks here, or spin a nuzlocke-style run in the Pokemon Roulette and see whether those numbers hold up.

Everything runs client-side in your browser: no account, no uploads, and the full 1025-species Pokedex with all 18 types is always one search away.