Random Number Generator – Generate Random Numbers Instantly
Our free random number generator lets you instantly generate one or more random numbers within any range you define. Whether you need a single lucky number, a set of lottery picks, or a unique list with no duplicates, this tool has you covered. Simply set your minimum and maximum values, choose how many numbers you want, and click generate.
The smallest number that can be generated.
The largest number that can be generated.
How many random numbers to generate (max 100).
Choose whether the same number can appear more than once.
Optionally sort the generated numbers.
Your results will appear here
How to Use This Calculator
1. Enter the minimum value (the lowest possible number you want). 2. Enter the maximum value (the highest possible number you want). 3. Choose how many random numbers to generate (up to 100 at once). 4. Select whether duplicates are allowed or if you want only unique numbers. 5. Optionally choose a sort order for your results. 6. Click Calculate to see your randomly generated numbers along with summary statistics.
How Random Number Generation Works
This tool uses your browser's built-in Math.random() function, which produces pseudo-random floating-point numbers between 0 (inclusive) and 1 (exclusive). We scale and shift this value to fit within your chosen range using the formula:
Result = Math.floor(Math.random() × (max − min + 1)) + min
Pseudo-Random vs. True Random
Most computers generate pseudo-random numbers using deterministic algorithms seeded by an unpredictable value (like the current time). While not mathematically "true" random, these numbers are statistically uniform and suitable for the vast majority of everyday uses such as games, giveaways, sampling, and decision-making.
Unique (No Duplicate) Mode
When you disable duplicates, the tool uses a Fisher-Yates shuffle on a pool of integers from min to max, then selects the first N values. This guarantees every number appears at most once — perfect for lottery draws or random sampling without replacement.
Sorting Options
- No Sorting: Numbers appear in the exact random order they were generated.
- Ascending: Numbers are arranged from smallest to largest.
- Descending: Numbers are arranged from largest to smallest.
Result Statistics
Along with the generated list, the tool displays the count, minimum, maximum, sum, and average of your results — handy for quick statistical insight into your random set.