The 60-second setup
- Open the random number wheel.
- Type 1 in From and 100 in To.
- Press Use range. The wheel now holds exactly 100 entries, one per whole number from 1 to 100.
- Spin. One number lands, and it is added to the results list.
That is the whole job. The range you see is always the range it draws from, so there is no hidden 0 or 101, and no number is favored over another.
What the wheel actually shows at 100 slots
A wheel with 100 slices cannot print 100 readable labels, so WheelMigo hides the slot labels once a wheel has more than 40 entries and shows the count ('100 entries') in the center instead. Every number still has an equal chance of being drawn; the wheel is the visible ritual and the winning number is announced in the results. If you want to watch individual labels go by, shrink the range to 40 numbers or fewer, for example 1 to 40.
What 'fair' means for 1 to 100
Each number has a 1-in-100 chance, exactly 1%, on every spin. The pick comes from crypto.getRandomValues, which returns a 32-bit number, and there is a subtle catch: 2^32 is 4,294,967,296, which is not a multiple of 100 (it leaves a remainder of 96). Taking that number modulo 100 in the obvious way would make 96 of the 100 values a tiny bit likelier than the other four, by about 1 part in 43 million. It would be invisible in practice, but WheelMigo removes it anyway: any raw value that falls in the leftover 96 is thrown away and redrawn, so all 100 numbers are exactly equal.
How often will a number repeat?
If you spin again and again with repeats allowed, each spin is independent, so a number you already saw can come up again. That happens sooner than most people expect. This is the birthday problem with 100 possible values instead of 365:
| Spins (repeats allowed) | Chance at least one number has repeated |
|---|---|
| 5 | about 10% |
| 10 | about 37% |
| 13 | about 56% (more likely than not) |
| 20 | about 87% |
Two more numbers worth knowing: the chance that one particular number, say 42, shows up at least once in 69 spins is about 50%, and in 100 spins it is only about 63%, not 100%. If you need every result to be different, turn on no-repeat rounds or draw a batch instead.
Why not just pick one in your head?
Because people are not random. In a large informal online survey by the science YouTube channel Veritasium, where around 200,000 people were asked for a random number from 1 to 100, answers piled up on numbers that feel random, including 37, 73 and many ending in 7. It was a self-selected online poll, not a controlled study, but it illustrates the point: a number that feels random to a person is not the same as a uniform draw. A wheel has no such favorites.
Draw several different numbers at once
For raffle tickets, seats, or picking questions from a list of 100, draw a batch. A batch returns different numbers, up to 100 per draw, and never repeats one within the same batch. For scale, there are 75,287,520 ways to choose 5 different numbers from 1 to 100, and 1,192,052,400 ways to choose 6, so every batch you draw is one of a very large set of equally likely outcomes.
A game that uses 1 to 100: guess my number
Spin once, keep the number hidden, and let players guess with 'higher' or 'lower' hints. Guessing the midpoint each time halves the possibilities, so any number from 1 to 100 can be found in at most 7 guesses (2^7 = 128 covers 100, while 2^6 = 64 does not). It is also a friendly way to see binary search in action.
When not to use it
The range is capped at 1,000 numbers, so a wheel is the wrong tool for millions of values or bulk generation; use a dedicated random number generator for that. And like every WheelMigo tool, it is meant for casual and classroom use, not for certified lottery or gaming draws, which require an audited system.