Click the number or press Generate — 100 possible outcomes
?Generating a random number from 1 to 100 means every integer has a 1-in-100 (1%) chance. The expected average result is 51. This range is widely used for percentage-based probabilities, exam simulations, and game mechanics.
Probability: Each number from 1 to 100 has exactly 1% probability on every roll. This is a discrete uniform distribution — there is no bias toward any particular value, and past results never influence future ones.
Common uses for this range: Percentage-based probability, guessing games, random selection from up to 100 items, statistical demonstrations.
This tool runs entirely in your browser. No data is sent to any server, no results are logged, and the generator re-seeds on every click.
Click the large number or press Generate. A random integer between 1 and 100 is selected with 1% probability for each value. You can also adjust the range using the fields above.
Yes. Math.random() in modern browsers uses a cryptographically seeded algorithm producing a uniform distribution. Each of the 100 integers between 1 and 100 has exactly equal probability.
The statistical mean of the range 1 to 100 is 51. Over many rolls, your results will converge toward this value. The standard deviation is approximately 28.87.
Use our Number Generator to generate up to 20 numbers at once with a no-repeats option — ideal for lottery picks and random sampling.