This calculator follows the common Showdown-style damage flow with 16 random rolls (85% to 100%). It is ideal for quick planning and matchup checks.
What this showdown damage calculator does
This tool estimates how much damage one Pokémon move can deal under a realistic competitive ruleset. Instead of guessing whether a move is a guaranteed knockout or a risky two-hit setup, you can quickly test levels, stats, type matchups, critical hits, weather, burn, and other multipliers.
The result gives you a damage range (minimum to maximum), average damage, and—if target HP is provided— the percentage range and an estimated hits-to-KO window. That makes this useful for:
- Team building and EV benchmarking
- Checking if your wall survives a key threat
- Choosing between a safer move and a higher-risk play
- Planning endgame lines where chip damage matters
How Showdown-style damage is calculated
Core structure
The damage system starts with a base damage value from level, move base power, attack stat, and defense stat. Then it applies battle modifiers like STAB, type effectiveness, weather, critical hits, and random roll.
In simplified terms:
- Compute base damage from level, power, Atk/SpA, Def/SpD
- Apply multipliers (STAB, effectiveness, weather, crit, burn, and custom modifier)
- Apply one of 16 random values from 85% to 100%
Why damage is a range, not a single number
Competitive players talk about “rolls” because every hit has a random component. Two identical turns can produce slightly different damage. This is why a move might be a “roll to OHKO” rather than a guaranteed knockout. The 16 damage rolls shown by this calculator help you see that uncertainty directly.
How to use this calculator effectively
Step-by-step
- Level: Usually 100 in standard singles formats, sometimes 50 in official doubles settings.
- Base Power: Enter the actual move power after temporary changes you want to model.
- Attack and Defense stats: Use final in-battle relevant stats (Atk/SpA vs Def/SpD).
- STAB: Choose 1.5x for normal same-type bonus, or 2x for Adaptability-style effects.
- Type effectiveness: Pick 0x, 0.5x, 1x, 2x, etc. based on matchup.
- Weather: Apply boosts/reductions when weather affects your move type.
- Critical hit: Toggle if you are evaluating a crit line.
- Burn: Applies only to physical attacks unless ignored by effects like Guts.
- Other modifier: Bundle item boosts, abilities, field effects, or screens into one multiplier.
Interpreting output for decision making
If your minimum damage percentage exceeds 100%, you have a guaranteed OHKO. If only the maximum exceeds 100%, it is a possible OHKO depending on roll. If neither exceeds 100%, use the KO range to understand how many turns you need without additional chip.
Practical competitive examples
Example 1: Confirming a revenge KO
Suppose your attacker is faster but frail. You only get one shot. Enter your move and target HP. If the maximum damage is still below target HP, you know that line fails without prior chip.
Example 2: Testing defensive investment
Increase the defender stat or HP input and compare ranges. You can quickly identify “survival benchmarks,” such as always living two hits after Leftovers recovery or guaranteed survival from a key boosted move.
Example 3: Crit-dependent lines
Toggle critical hit on and off to see whether you need a crit to break through. This is especially useful in late game scenarios where you must decide between setup and immediate pressure.
Common mistakes and how to avoid them
- Wrong stat pairing: Physical moves use Attack vs Defense; special moves use SpA vs SpD.
- Forgetting STAB: Missing this modifier can dramatically understate damage.
- Ignoring burn on physical attackers: Burn can halve damage unless bypassed.
- Skipping field effects: Screens, item boosts, and ability multipliers matter a lot.
- Treating max roll as guaranteed: Always evaluate min roll for consistency.
Quick optimization checklist
- Check neutral and resisted targets before finalizing coverage moves.
- Use HP percentage output to map hazard and chip breakpoints.
- Compare item choices by editing only the “Other Modifier” value.
- Test both critical and non-critical lines for endgame planning.
- Use the 16-roll list when you need precise probability intuition.
Final thoughts
A showdown damage calculator is one of the highest-leverage tools in competitive play. It turns vague “I think this KOs” guesses into concrete numbers you can trust during prep and in match review. With this page, you can run clean, fast checks and make sharper in-game choices.