Random bingo number caller with visual board tracking, call history, and auto-call mode with adjustable speed.
This tool runs a standard 75-ball bingo draw in the browser. Each call announces a letter-number pair such as B-9 or O-63, marks the number on a 5-by-15 board, and appends it to a call history in order. Auto-call mode makes the next draw automatically on a timer you can speed up or slow down, so one person can run a whole session. The thing most people get wrong: numbers are drawn without replacement, so no number can be called twice in a game, and the draw never evens itself out no matter how long the game runs.
A concrete input and expected output from the current implementation.
Input
A new game whose first three calls were B-9, I-24, and N-33.
Expected output
The board marks B-9, I-24, and N-33; the history lists them in that order; 72 numbers remain in the draw pool (14 in each of B, I, and N, and 15 in G and O).
75 minus 3 is 72, and because each column holds exactly 15 numbers, removing one call from each of three columns leaves 14 in those columns. The next call is chosen at random from the 72 remaining numbers, so it cannot be predicted in advance.
A game starts with all 75 numbers: B 1-15, I 16-30, N 31-45, G 46-60, O 61-75. Every call removes one number from the pool at random, so a repeat within a game is impossible and each number appears at most once. After 75 calls the pool is empty and the game is over; starting a new game rebuilds the full pool from scratch.
Each call is marked on the board grid and added to the history in order, giving players a way to verify what was announced. Auto-call mode fires the next draw on an adjustable interval, which is how one person runs a whole session hands-free; manual mode waits for a button press instead. The game ends when all 75 numbers have been drawn.
No. Each number is drawn without replacement, so once a number is called it leaves the pool and cannot reappear until a new game starts. If you believe a number repeated, you are probably looking at history from two different games: starting a new game rebuilds both the pool and the history.
Only if nobody calls bingo first; a game usually ends when someone completes a card, well before all 75 numbers. If a game does run to completion at one call every 3 seconds, it takes 75 x 3 = 225 seconds, about 3 minutes 45 seconds. Slower speeds scale proportionally.
The example and behavioral notes were checked against the browser implementation. Standards and primary references below define the relevant format, formula, or platform behavior.
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