Games calculators
14 browser-based games calculators and utilities. Every formula runs locally - no upload, no sign-up, no tracking of the numbers you type.
All games tools
14 tools, each runs locally in your browser. Click any card to open it.
Chess Elo Rating Calculator takes game state, settings, opponent profile and returns the matching chess elo rating res…
♟️ Chess Clock takes game state, settings, opponent profile and returns the matching ♟️ chess clock result. Runs entir…
⚡ Reaction Time Test takes game state, settings, opponent profile and returns the matching ⚡ reaction time test result…
RPS - solved in random play (33% each). But humans aren't random. The AI tracks your last move and predicts your next,…
🎮 2048 Game takes game state, settings, opponent profile and returns the matching 🎮 2048 game result. Runs entirely …
🎯 Aim Trainer takes game state, settings, opponent profile and returns the matching 🎯 aim trainer result. Runs entir…
🎲 D&D Dice Roller takes format and optional constraints and returns the matching 🎲 d&d dice roller result. Runs enti…
🎲 Probability Simulator is a free games & brain calculator that gives you a deterministic answer for 🎲 probability s…
🏛️ World Capitals Quiz takes game state, settings, opponent profile and returns the matching 🏛️ world capitals quiz …
Eat food to grow. Don't hit walls or yourself. Arrow keys / WASD.
🔢 Sudoku is a free games & brain calculator that gives you a deterministic answer for 🔢 sudoku questions. Runs entir…
🚩 Country Flags Quiz takes game state, settings, opponent profile and returns the matching 🚩 country flags quiz resu…
Stack the blocks. Clear full rows. Don't reach the top.
Guess the 5-letter word in 6 tries. Green = right spot. Yellow = wrong spot.
About games
Games calculators cover the math gamers, puzzle solvers, and casino players reach for: Wordle solver and best-starting-word analysis, Sudoku checker and step-by-step solver, anagram solver, reaction-time test, dice probability for D&D / Yahtzee / craps, poker hand-probability and pot-odds, blackjack basic-strategy and card-counting expected value, lottery odds for major draws, and chess Elo gain/loss calculation.
Use these to find the optimal Wordle opener (audio, arose, ratio, raise top the list by entropy), verify a tough Sudoku puzzle has a unique solution, compute the probability of rolling a Yahtzee in one roll vs three, check pot odds before calling a river bet, or compute expected Elo change after a tournament round.
Sources: information theory (Shannon entropy) for Wordle solver scoring, exact dice/poker combinatorics for probability tools, Hi-Lo card-counting system for blackjack, FIDE Elo formula. Decision support only; gambling involves variance these tools cannot remove.
Common use cases
Real scenarios where the games calculators in this category earn their keep.
Wordle best opener
Words ranked by expected information (entropy in bits) against the answer wordlist. AUDIO, ROATE, RAISE, AROSE typically top the list at 5.83-5.88 bits per guess.
Sudoku unique-solution checker
Verifies a puzzle has exactly one solution (real Sudoku rule). Outputs the solution and step trace. Useful for puzzle constructors.
Yahtzee probability
Probability of rolling a Yahtzee in 1, 2, or 3 rolls (4.6%, 7.7%, 4.6% combined for ≥1 across all kept-die strategies). The dice tool runs custom queries.
Poker pot odds and equity
Pot odds = call / (pot + call). Equity = hand-win probability vs opponent range. Call when equity > pot odds. The poker tool runs both.
Chess Elo change
Expected score = 1 / (1 + 10^((opponent_rating - your_rating)/400)). Actual score - expected score, scaled by K-factor (40 / 20 / 10 depending on rating).
Key terms
Glossary for the formulas and conventions these tools use.
- Wordle entropy
- Expected information (bits) revealed by a guess. Higher entropy = better opener. Theoretical max is log₂(2,309) ≈ 11.2 bits over 6 guesses.
- Sudoku uniqueness
- A valid Sudoku puzzle has exactly one solution. Multiple solutions violate the puzzle definition; zero solutions mean an over-constrained input.
- Pot odds
- Cost to call divided by (pot + cost to call). Express as percentage. Call when your hand equity exceeds pot odds.
- Equity (poker)
- Probability your hand wins by showdown against the opponent's range, on the current street.
- Card counting (Hi-Lo)
- Blackjack system. +1 for 2-6, 0 for 7-9, -1 for 10-A. True count = running count / decks remaining. Bet size scales with true count.
- Elo K-factor
- Volatility coefficient. 40 for new/junior players, 20 for established, 10 for top GMs. Determines how much a single game shifts your rating.
- House edge
- Casino's long-run percentage of total wagered. Roulette (European) 2.7%, blackjack basic strategy 0.5%, slots 5-15%.
Frequently asked questions
Short answers to the most common games questions.