Random Number Between 1 and 100
A whole number from 1 to 100, redrawn every time you press. All 100 values are equally likely, so each one turns up 1% of the time, with no memory of the last draw.
1 to 100 1
100 possible values, each equally likely. Tick nothing and repeats can happen; that is what random means.
1% each, and repeats sooner than you think
Each of the 100 values has a 1 in 100 chance on every draw. The range is wide enough that people treat duplicates as suspicious, and they should not.
Take 12 draws and the chance of two matching is 49.7%, just under a coin flip. Take 13 and it rises to 55.7%, so a repeat becomes the favourite. At 20 draws it is 87%. Collisions in a hundred-slot range are ordinary.
Covering the range is the opposite problem: seeing all 100 numbers at least once takes about 519 draws on average, not 100.
People do not pick 1 to 100 evenly
Ask someone to name a number in this range and they avoid 1 and 100, skip the round tens, and drift toward odd numbers in the middle. That is exactly why a guessing game with a human picker is winnable and this page is not. The generator has no taste and no favourites.
Doing it by hand
- Two ten-sided dice. One is the tens digit, one the units, and 00 counts as 100. That is 100 outcomes for 100 values, perfectly even with nothing to discard.
- Seven coin flips. Read heads as 1 for a number from 0 to 127, keep 1 to 100, and re-flip the other 22% of the time.
A hundred-sided die does the same job in one throw, which is roll a d100. For a wider spread try 1 to 1000, or start at the random number generator.