Random Number Generator
Set a minimum and maximum, then generate.
How it works
The generator returns a whole number from the minimum to the maximum, including both ends, with every number equally likely. Between 1 and 100 there are 100 possible results, each with a 1% chance. If you enter the minimum and maximum the wrong way round, they are swapped for you.
People aren’t good at picking random numbers
Asked to pick a number between 1 and 100, people choose some numbers far more often than others. Numbers ending in 7 are popular, while round numbers and doubles like 50 or 33 are avoided because they don’t feel random. That bias is why a generator is fairer for raffles, sampling, or settling disputes.
Repeats happen sooner than you think
Each number is drawn independently, so the same number can come up twice. The chance of at least one repeat grows quickly, a result known as the birthday problem:
| Range | 5 draws | 10 draws | 23 draws | 50 draws |
|---|---|---|---|---|
| 1 to 10 | 70% | >99.9% | 100% | 100% |
| 1 to 100 | 9.7% | 37% | 94% | >99.9% |
| 1 to 365 | 2.7% | 12% | 51% | 97% |
| 1 to 1000 | 1.0% | 4.4% | 23% | 71% |
With 23 people, there’s about a 50% chance two share a birthday. If you need numbers that never repeat, such as for numbered raffle tickets, use the raffle picker or the lottery generator’s custom mode, which both draw without replacement.