Random number wheel: pick numbers without repeats for raffles and class

2026-10-30

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You are drawing five raffle tickets numbered 1 to 20 on a random number wheel, and ticket 7 comes up twice. Nobody did anything wrong. The wheel just did what wheels do.

With 20 slices and five spins, there is about a 42% chance that at least one number repeats. Here is why, and the one setting that stops it.

In this post

Why repeats happen so often
Removing drawn numbers
Setting up a number wheel
When a wheel is the wrong tool

1. Why repeats happen more than you expect

Each spin is fresh. The wheel does not remember that 7 already won, so 7 has the same chance on spin five as it had on spin one.

The odds of at least one repeat add up fast:

| Range | Spins | Chance of a repeat | |---|---|---| | 1 to 10 | 3 | 28% | | 1 to 10 | 5 | 70% | | 1 to 20 | 5 | 42% | | 1 to 30 | 10 | 82% | | 1 to 100 | 10 | 37% |

It is the same math as the birthday problem. You need far fewer spins than the number of slices before a repeat becomes likely.

▲ Ten spins on a 1 to 30 wheel repeat a number more often than not

2. Remove drawn numbers so nothing repeats

For a raffle, a class call-on list or a presentation order, you almost always want each number once. The fix is to take a number off the wheel after it wins.

The Wheel Spinner on ZAGO.TO has a remove the winner switch. Turn it on before the first spin.

Each winning number drops out, and the next spin only lands on what is left. With 20 tickets and the switch on, the 20th spin always gives the last ticket.

This is the same idea as the name version, covered in random name picker for classrooms and teams.

When should you leave repeats on? Rolling dice for a board game, picking a random page number, or a classroom "spin for points" game where the same reward can come up again.

A teacher spinning a number wheel for the class

▲ Switch on "remove the winner" before the first spin

3. Setting up a number wheel

Choose the 1 to 10 preset, or add numbers one at a time in the entry box. A few tips:

Raffle tickets: use the numbers printed on the tickets, not 1 to N, if some tickets went unsold
Prizes in order: draw the smallest prize first so the big one comes last
Share the result: copy the result link and paste it in the group chat, so people see the same wheel

Your list is kept in this browser, so the same numbers are there next time you open the page.

4. When a wheel is the wrong tool

A wheel is good for show. For a 1 to 100 or 1 to 1000 range, typing every number is slow, and the slices get too thin to read. Our wheel has no range box that fills 1 to 100 for you.

For big ranges, a plain random number generator is faster.

For 10 to 30 numbers that a room is watching, the wheel is easier to trust because everyone sees it land.

The general fairness math is in spin the wheel to decide.

Quick summary

Repeats are normal when drawn numbers stay on the wheel
Turn on remove the winner for raffles and turn order
Use a wheel for small ranges, a generator for big ones

Spin your numbers on the ZAGO.TO Wheel Spinner. No sign-up.

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