Random Number Between 0 and 100
Percentages including both ends. 101 possible values, not 100.
101 possible numbers, 0 to 100.
The odds on 0 to 100
There are 101 possible results, each with a 1 in 101 chance. Every draw is independent - a number coming up once does not make it any less likely next time, and long gaps between a particular number appearing are ordinary rather than meaningful.
The off-by-one that catches people out
A range of 0 to 100 inclusive has 101 possible outcomes, not 100. If you are modelling a percentage roll and want exactly a hundred equally likely results, you want 1 to 100 or 0 to 99. It is a small thing that quietly skews simulations.
Drawing several at once
Set the count above one to draw more than one number. Repeats are off by default, so each number comes out once - which is what a raffle or a lottery line needs. Turn them on when the draws should be independent of each other.
Checking the result
Every draw is generated from your browser's cryptographic random number generator and comes with a receipt recording the range, the seed and the result, so anyone can reproduce it. Here is how that works. To set a different range, the main generator takes any values you like.
Other ranges
- 1 to 2A coin flip in number form. Useful when you want the result recorded as a value rather than a face.
- 1 to 3The smallest range where the odds stop feeling intuitive. Each number lands about 33.3% of the time.
- 1 to 4Four-way choice: quarters of a group, the four suits, or a d4 without the dice.
- 1 to 5Five options, 20% each. The usual shape for a shortlist you have already narrowed down.
- 1 to 6A standard die, without the die. The most-searched small range there is.
- 1 to 7Seven days, seven options. Common for picking a day of the week at random.
- 1 to 8Eight-way splits: bracket seeds, octagon positions, or a group of eight.
- 1 to 9Single digits excluding zero. Handy for grids, puzzles and Sudoku-style setups.