Bingo card sizes: 3×3, 4×4 or 5×5?
A standard bingo card has 25 squares (5×5). Compare 3×3, 4×4 and 5×5: items per card, free space, calls to a first bingo and which size fits your group.
You're making cards for a party or a class, and the generator asks: 3×3, 4×4 or 5×5? This page answers the questions behind that choice. How many squares does each card have? Which ones get a free space? How many items do you need, and how fast does someone win?
For game length, we didn't guess. We ran our simulation with our own card engine: 10,000 decks per setup, 100 games each. The method is at the end of this page.
Quick answer: A standard bingo card has 25 squares in a 5×5 grid: 24 numbers or items plus a free space in the center. Smaller cards have 9 squares (3×3) or 16 squares (4×4). In our simulation, smaller cards end sooner: with 20 players, the first bingo came at a median of 5 calls on 3×3, 11 on 4×4 and 13 on 5×5.
How many squares are on a bingo card?
A standard bingo card has 25 squares, or spaces, in 5 rows and 5 columns (a 5x5 grid). The center is usually a free space, so you mark 24 numbers or items.
That's the classic 75-ball card. Its columns spell B-I-N-G-O. By convention, B holds 1 to 15, I 16 to 30, N 31 to 45, G 46 to 60 and O 61 to 75. The middle square is the free space.
Smaller cards exist too. A 3×3 card has 9 squares and a 4×4 card has 16. In number bingo, 30-ball games usually use a 3×3 grid with nine numbers, and 80-ball games a 4×4 grid with 16 numbers and no free space.
UK 90-ball cards are a different shape. They have 3 rows and 9 columns, with five numbers and four blanks in each row. That's 15 numbers per card.
3×3, 4×4 and 5×5 bingo cards side by side
This table answers most size questions at a glance. It covers custom bingo, where the squares hold words or pictures instead of numbers.
| Card size | Squares | Free space | Items per card | Calls to first bingo, median (p10 to p90) | We suggest it for |
|---|---|---|---|---|---|
| 3×3 | 9 | Optional, center | 8, or 9 without free space | 5 (2 to 7) | Ages 3 to 5, very short games, small tables |
| 4×4 | 16 | None, no center square | 16 | 11 (8 to 15) | Early readers, picture cards, small groups |
| 5×5 | 25 | Optional, center | 24, or 25 without free space | 13 (9 to 16) | Older kids, adults, classrooms, parties |
The call figures come from our simulation, described below, with a free space on 3×3 and 5×5. The last column is a suggestion, not a rule.
Which bingo card size should you pick?
We suggest 5×5 for most groups, 4×4 for young readers and picture games, and 3×3 for preschoolers or a game that has to end fast.
3×3 for little kids and quick rounds
A 3×3 card has the fewest squares to scan, so small kids can follow along. We suggest it for ages 3 to 5. It also ends fast: a median of 5 calls with 20 players in our simulation. With only 8 pictures per card, each one can print big. See these Halloween picture cards for kids for the idea.
4×4 for early readers and picture bingo
A 4×4 card gives each square more room than a 5×5 on the same page. There's no free space, so all 16 squares hold an item. We suggest it for early readers who are still sounding out words. Try it with a classroom vocabulary set.
5×5 for adults, classrooms and parties
The 5×5 is the size of the classic 75-ball card. With 24 items, you have room for inside jokes and occasion details. Games still stay short, with a median of 13 calls for 20 players. We suggest it for older kids, adults and mixed groups. Try a jungle baby shower set or these Christmas bingo ideas.
Does card size change how long a game lasts?
Yes. Smaller cards and bigger groups reach a bingo sooner. With 20 players, the first bingo came at a median of 5 calls on 3×3, 11 on 4×4 and 13 on 5×5.
| Players | 3×3 | 4×4 | 5×5 |
|---|---|---|---|
| 5 | 8 | 15 | 17 |
| 20 | 5 | 11 | 13 |
| 50 | 3 | 10 | 11 |
For timing by the clock, see how long a bingo game lasts. Three things stand out:
- 3×3 is the real outlier. Its games take about half the calls of 4×4 or fewer, and its median falls from 8 calls to 3 between 5 and 50 players.
- 4×4 and 5×5 are close. They sit within 1 to 2 calls of each other at every group size. Remember, 4×4 has no free space and 5×5 has one.
- Ties happen. With 20 players, about 16% of games had two or more winners on the same call, on every size.
Our decks are built so no two cards share a winning line. That still doesn't stop ties, because two different lines can finish on the same call. We suggest you agree on a tie rule before the first call.
We count game length in calls only. How long that takes on the clock depends on your calling pace.
Which bingo card sizes have a free space?
Of the three sizes, only the odd grids, 3×3 and 5×5, can have a free space. Only they have a center square.
A 4×4 card has no middle square, so it has no free space. On our cards, the free space is optional. Turn it off and each card holds one more item: 9 instead of 8 on 3×3, and 25 instead of 24 on 5×5.
How many items do you need for each card size?
You need at least as many items as squares to fill: 8 for a 3×3 with a free space, 16 for 4×4, 24 for 5×5. For cards that really differ, you need more.
The reason is simple. With exactly 9 items on a 3×3 without a free space, every card holds the same 9 items in a new order. That gives 362,880 possible 3×3 cards, which is 9 × 8 × 7 … × 1. But since every player has the same items, everyone fills their card together on a full-card game.
A longer list fixes that. Our simulation used 40 items. With 40 items and a free space, there are 3,100,796,899,200 possible 3×3 cards, about 3.1 trillion. That rises to about 1.3×10²⁴ on 4×4 and about 3.9×10³⁴ on 5×5.
Other figures you'll see count different things. The orders of exactly 25 items on a 5×5 make a 26-digit number (25 × 24 × … × 1). About 5.52×10²⁶ counts 75-ball cards, where each column draws from its own 15 numbers. They answer different questions, so they don't contradict each other.
On BingoCard Lab, the AI writes 30 items by default, and you can go up to 60. If your list is too short for the cards you want, the app tells you how many cards it allows. You can make cards in any of the three sizes.
How big is a printed bingo card?
There's no single standard for bingo card dimensions. In the four examples below, cards range from about 4 by 4 inches to 9.75 by 10.5 inches.
The examples come from bingo supply store product pages:
- Paper bingo sheets with a face size of 4 by 4 1/16 inches (CT Bingo Supply).
- Reusable hard cards, 5 1/2 inches high by 5 inches wide (Casino Supply).
- Large cards, 8 inches wide by 9 1/4 inches high (LSS Products).
- Extra-large jumbo cards, 9.75 inches wide by 10.5 inches tall (US Bingo).
When you print your own, our PDFs fit 1, 2 or 4 cards per page on Letter or A4. We suggest 1 per page for large print or a 5×5 with pictures. For small 3×3 cards, 4 per page saves paper.
How we ran the numbers
We used the same card engine that builds our decks. Our simulation: 10,000 decks per setup, 100 games each, for each size and group.
- One list of 40 items, each called once, in random order.
- Every player gets a different card, and no two cards share a winning line.
- A free space in the center on 3×3 and 5×5, none on 4×4.
- The first full row, column or diagonal wins.
- Groups of 5, 10, 20, 30 and 50 players.
We report the median, plus p10 and p90. The p10 marks the quick games, and p90 the slow ones.
There are limits. The games in each deck are related, since each deck plays 100 call orders. So these aren't independent games. The results fit custom word or picture bingo with a 40-item list. They don't apply to 75-ball number bingo or blackout games.
Frequently asked questions
How many numbers are on a bingo card?
A 75-ball card has 24 numbers plus a free space in the center, so 24 of its 25 spaces get marked. A UK 90-ball card has 15 numbers, five in each of its 3 rows.
Why are bingo cards 5×5?
On a 75-ball card, the five columns match the five letters of B-I-N-G-O. Each column has its own range of 15 numbers, as described above.
Does a 4×4 bingo card have a free space?
No. A 4×4 grid has no center square, so there's nowhere to put one. All 16 squares hold an item.
How many different bingo cards are possible?
It depends on the list. For 75-ball cards, the count is about 5.52×10²⁶. With a 40-item list, we count about 3.1 trillion possible 3×3 cards.
Can two players get bingo at the same time?
Yes. With 20 players, about 16% of games had two or more winners on the same call in our simulation. That held even though no two cards shared a winning line.
Can I make a 6×6 or 7×7 bingo card?
Some generators offer larger grids. BingoCard Lab makes 3×3, 4×4 and 5×5 cards only.
Make cards in the size you need
Pick a size, describe your game, and the AI writes the list. New to the game? Start with how to play bingo. You can download 1 to 100 different cards at a time.
Words-only cards are free and unlimited. Illustrated PDFs need an Event pass ($4.99 once, per set) or Pro ($9.99/month or $59/year). Your first illustrated set is free to preview. See pricing for illustrated cards, or start your cards now.