Everyday Life
Random Number Generator
Generate single or multiple random integers within a custom range.
Inputs
Results
Generated Output
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How It Works
The generator produces pseudorandom integers using JavaScript's native float function `Math.random()`. To generate a value within bounds: $Value = \lfloor Math.random() \times (Max - Min + 1) \rfloor + Min$. When requesting unique numbers, the tool shuffles a number index array using the modern Fisher-Yates algorithm, then slices the requested subset.
Formula Used
Random Integer = ⌊ Math.random() × (Max − Min + 1) ⌋ + Min
This scales JavaScript's native random float (which ranges from 0 to 1) to the size of the target range, floors it to an integer, and offsets it by the minimum value.
Worked Example
Here is a step-by-step example of how these values are calculated:
Min
1
Max
10
Count
5
Unique
True
Sort
True
Result: Output set: `2, 4, 5, 8, 9`.
Frequently Asked Questions
Are these numbers cryptographically secure?
No. This generator uses standard `Math.random()`, which is fast and suitable for statistics, games, or general decisions, but not for cryptography or high-stakes lotteries. Use the **Secure Password Generator** for security-sensitive entropy needs.
Why is there a limit of 1000 numbers?
To protect system performance and avoid freezing browser processes from DOM rendering delays when handling excessively large lists of elements.