A damage calculator that already knows Radical Red 4.1 — its species, its move list, its abilities and items, and every documented boss set. Pick a fight, load the team you are about to face, and read the ranges in both directions on your phone while the game is paused.
Open the damage calculator Load a boss team
| Fed in | What it does |
|---|---|
| Radical Red 4.1 data | A fork of the Showdown engine carrying RR's own dex, moves, abilities and items — not the base-game numbers with a different name on them. |
| Documented boss sets | Any boss's six, at their documented level, ability, nature, EVs and held item. Loaded from a boss page or the Bosses tab; the level a fight uses follows your run's cap where the docs say "highest level −3". |
| Both directions | Your damage to them and theirs to you, side by side, so "can I take the hit" is answered at the same time as "can I KO it". |
| Weather and terrain | Set by hand or seeded from the fight — several bosses run permanent Trick Room, rain or snow, and the sets they bring only make sense under it. |
| Field conditions | Hazards, screens, Tailwind and Leech Seed, per side, so Speed and damage both account for what is already on the field. |
| Sturdy and Focus Sash | Flagged separately as "survives at 1 HP", because the engine does not model them — multi-hit moves and Parental Bond break through, and Mold Breaker beats Sturdy but not the Sash. |
| Type overrides | Protean, Libero, Soak and Forest's Curse change what a Pokémon is; both sides let you set the typing the calculation should use. |
The calculator is one Pokémon against one Pokémon, which is the right tool when you are deciding a single turn. When the question is the whole fight — which of your six can do anything at all against their six — that is Battle Readiness, and it runs the same engine across every pairing at once.
Boss sets load in one click from any of these:
Sabrina Giovanni Elite Four Every boss