Gaming Tools

Free gaming and tabletop probability calculators that run entirely in your browser — dice distribution, D20 advantage and hit chance, D&D stat rolls, gacha pity, drop rate, poker outs and pot odds, chess Elo, MTG hypergeometric draws, DPS, wargame dice, dice pools and K/D ratio. No accounts, nothing uploaded.

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Dice Probability Calculator

Enter dice notation like 3d6+2 and get the full probability curve: mean, min, max, most likely total and the odds of hitting a target.

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D20 Advantage / Hit-Chance Calculator

Work out your d20 hit or save chance against any AC or DC, with advantage and disadvantage odds plus the crit chance.

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D&D Stat / Ability Score Roller

Roll D&D ability scores with 4d6 drop lowest or 3d6, use the standard array, or plan a 27-point buy — with modifiers and totals.

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Gacha Pity Calculator

Estimate your gacha odds with soft and hard pity: chance to pull within N attempts, expected pulls, and an optional 50/50 featured mechanic.

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Drop Rate / Loot Probability Calculator

Find your chance of at least one drop over N attempts, the dry-streak odds, expected attempts, and attempts needed for 50/90/99% confidence.

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Poker Outs & Pot Odds Calculator

Turn your outs into a hit percentage, compare it to your pot odds, and get a +EV or −EV call verdict with the rule of 2 and 4.

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Chess Elo Rating Calculator

Calculate your new chess Elo rating after a win, draw or loss using the official expected-score formula, with rating change and win chance.

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Hypergeometric Draw Calculator (MTG / TCG)

Hypergeometric probability calculator for MTG and card games: the odds of drawing your card, exactly, at least, at most k, and at least one.

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DPS / Damage Calculator

Calculate DPS from min/max hit, attack speed, crit chance and crit multiplier, plus average hit, effective hit and time to kill.

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Wargame / Warhammer Dice Calculator

Warhammer and wargame dice odds: average hits, wounds, unsaved wounds and damage from to-hit, to-wound, save, AP and rerolls.

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K/D Ratio & Win Rate Calculator

Calculate your K/D ratio, KDA, win rate and headshot percentage, plus how many kills you need to reach a target K/D.

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Dice Pool Success Calculator

Dice pool success odds for Shadowrun and World of Darkness: chance of hitting the successes you need, expected hits and botch chance.

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D&D 5e Ability Modifier & Point-Buy Calculator

Turn D&D 5e ability scores into modifiers, get the proficiency bonus for any level, and price your array against the 27-point point-buy budget.

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D&D 5e Spell Save DC, Attack Bonus & Encumbrance

Compute your D&D 5e spell save DC and spell attack bonus, plus Strength-based carrying capacity and encumbrance thresholds in pounds and kilograms.

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D&D 5e Encounter Difficulty (XP Budget) Calculator

Rate a D&D 5e combat as Easy, Medium, Hard or Deadly by comparing your party's XP thresholds to the adjusted XP of the monsters using the 2014 DMG tables.

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D&D 5e Hit Points Calculator

Compute a D&D 5e character's maximum hit points from class hit die, level and Constitution, using the fixed-average or maximum-per-level rule, plus Tough and Hill Dwarf.

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Pokémon Stat Calculator (Gen 3-9)

Compute a Pokémon's final stat from its base stat, IV, EV, level and nature — matching the exact in-game numbers for Generation III through IX.

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Pokémon IV Calculator (Reverse)

Back-solve a Pokémon's possible Individual Values from its displayed stat, base stat, level, nature and EVs by inverting the Gen III+ stat formula.

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Pokémon Type Effectiveness Calculator

Look up the damage multiplier of any attacking move type against a single or dual-type Pokémon, including 4× weaknesses, resistances, and immunities.

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Pokémon Catch Probability Calculator

Estimate the chance of catching a wild Pokémon from its catch rate, current and max HP, Poké Ball type, and status condition using the Gen III/IV formula.

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Video-Game EXP / Level Curve Calculator

Compute total experience to reach any level and EXP to the next level for the six Pokémon-style growth groups: Fast, Medium Fast, Medium Slow, Slow, Erratic, Fluctuating.

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Yahtzee Scorer & Odds Calculator

Score any five-dice Yahtzee roll across all 13 categories, highlight the best-scoring category, and see the single-roll probabilities of every key combination.

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Blackjack Odds & Basic-Strategy Calculator

Get the dealer bust and outcome probabilities by upcard and the correct basic-strategy action (hit, stand, double, split) for your hand — pure math, no wagering.

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