Games and Puzzles Calculators

Domino Draw Probability Calculator (Boneyard Odds)

Calculate the chance of drawing a specific domino from the boneyard. Works with double-6, double-9, and double-12 sets at any point in play.

Powerball Odds Calculator (Jackpot and All Tiers)

Calculate Powerball odds for jackpot and all 9 prize tiers. Multiple-ticket math, expected value at any jackpot size, and the math against you.

Rock Paper Scissors Probability Calculator

Calculate win, loss, and draw probabilities in Rock Paper Scissors against an opponent with any chosen mix. Find the optimal Nash counter-strategy.

Bingo Card Generator

Generate printable BINGO cards with random numbers in the standard B-I-N-G-O format. Up to 4 unique cards per click for parties, classrooms, and events.

Domino End-of-Round Penalty Calculator (All Fives)

Add up losing hands and find the bonus the winner takes after each round (rounded to nearest 5 in All Fives, Muggins, or Znif scoring).

Lottery Number Generator

Generate random lottery numbers for Powerball, Mega Millions, EuroMillions, and more. Pick up to 5 lines at once with a single click for any lottery game.

All Fives Domino Score Calculator (Muggins / Znif)

All Fives domino scoring made simple. Enter the open-end pip values and see whether your move scores points (Muggins, Five-Up, and Znif rules).

Chess Win Probability Calculator

Calculate chess win, draw, and loss probabilities from Elo rating difference. Enter both ratings to see expected outcomes based on the Elo system.

Game Night Duration Calculator

How long will your game night last? Enter the number of players, games you want to play, and complexity level to estimate total time including setup and breaks.

Trivia Night Score Estimator

Predict your trivia night score from team size, rounds, questions per round, and estimated accuracy. Get your expected score and estimated winning odds.

Blackjack Expected Value and House Edge Calculator

Calculate the house edge and expected value of blackjack under different rule sets. See how rule variations affect your long-run expected loss per hour.

Lottery Expected Value Calculator

Calculate the expected value of a lottery ticket and the true odds of winning. See how jackpot size, taxes, and lump-sum discounts affect the rational value.

Poker Starting Hand Odds Calculator

Calculate the probability of being dealt specific Texas Hold'em starting hands and your approximate win rate against a field of opponents.

Dice Probability Calculator

Calculate the probability of rolling any target sum with multiple dice. Supports d4, d6, d8, d10, d12, d20, d100. Includes D&D advantage and disadvantage.

Bingo Number Caller / Generator

Generate random Bingo calls with the classic B-I-N-G-O column format. Perfect for hosting Bingo nights at home, school, or community events.

Craps Probability Calculator

Calculate exact probabilities for every craps bet. See odds, house edge, and expected value for pass line, don't pass, come, field, and proposition bets.

Keno Odds Calculator

Calculate exact probabilities and payouts for Keno based on how many numbers you pick and how many you match. See expected value for any Keno game.

ROT13 Encoder / Decoder

Encode or decode text using ROT13, the simple letter substitution cipher that shifts each letter 13 positions. Commonly used online for spoiler text.

Roulette Probability Calculator

Calculate exact odds and expected value for every roulette bet type. Compare American (38 slots) vs European (37 slots) wheel probabilities.

Scrabble Word Score Calculator

Calculate the exact score for any Scrabble word including double/triple letter and word score squares. Perfect for checking scores or learning tile values.

Vigenere Cipher Encoder / Decoder

Encode or decode text using the Vigenere cipher with any keyword. A polyalphabetic substitution cipher stronger than Caesar cipher.