Generate a random whole number from 1 to 100, for percentile rolls, giveaways and guessing games.
Press Generate for a random number between 1 and 100. Both ends are included and each of the 100 numbers has exactly a 1 in 100 chance.
Odds for numbers between 1 and 100
Possible numbers
100
Chance of any one number
1 in 100 (1.0%)
Chance of repeating the last number
1 in 100
Chance a given number appears at least once in 100 picks
63.4%
Average result over many picks
50.5
Even / odd numbers
50 even, 50 odd
The last-but-one row surprises many people: even with 100 picks, a particular number has a 36.6% chance of never coming up, because picks are independent.
What a 1–100 range is used for
A random number between 1 and 100 is handy for percentile rolls, giveaways and guessing games.
What are the odds of getting a specific number between 1 and 100?
Each number has a 1 in 100 chance (1.0%) on every pick.
Can the same number come up twice in a row?
Yes, if repeats are allowed: the chance of repeating the previous number is 1 in 100. Tick "No repeats" when picking several numbers to get all-different results.
Are 1 and 100 included?
Yes. Both ends are included, so there are 100 possible numbers.