# Random Number Generator

- **URL:** https://codeasystem.com/calculators/math/random-number-generator/
- **Category:** math
- **Description:** Draw one to one hundred random integers within any range, optionally requiring unique picks, sorted for readability.
- **Primary output:** Request summary: 5 random number(s) between 1 and 69

## Inputs
- Minimum (name: `min`, type: number, example: 1)
- Maximum (name: `max`, type: number, example: 69)
- How many numbers (name: `count`, type: number, example: 5)
- Allow repeats? (name: `unique`, type: select)

## Outputs
- Request summary: 5 random number(s) between 1 and 69
- Your numbers: 7 23 46 50 63
- Draw style: Repeats allowed

## Formula / methodology
```
Pick = min + floor(random() × (max − min + 1))   per draw
```

Each draw maps the platform’s uniform Math.random() onto your integer range. Unique mode keeps a set of already-drawn values and redraws collisions until the requested count is met; feasible only when the count fits inside the range, which is validated up front. Results arrive sorted ascending for easy checking.

## Assumptions & limitations
- Randomness comes from the platform’s Math.random; not cryptographically secure.
- Both range endpoints are inclusive.
- Unique draws require the range to contain at least as many integers as picks.

## How to use
1. **Set the range**; Minimum and maximum, both inclusive whole integers.
2. **Choose quantity and repeats**; One to one hundred numbers; uniqueness optional but common for raffles.
3. **Read your numbers**; Sorted in the “Your numbers” row; rerun for another draw whenever you like.

## Example
Five unique lottery-style picks between 1 and 69; press calculate again for a fresh draw each time.

Result for these inputs:

```
Request summary: 5 random number(s) between 1 and 69
```

## About this calculator
### Where random numbers earn their keep

Lottery lines, giveaway winners, sampling survey respondents, shuffling practice problems, picking who presents first; fair selection removes both bias and the appearance of it.

### Unique versus independent

Lottery balls are drawn without replacement (unique mode); dice rolls repeat freely. Choosing the wrong style quietly changes your odds, so match the draw mechanics of whatever you are simulating.

### A note on security

Math.random is fast and fine for games and demos but predictable to determined attackers. Passwords, tokens and cryptographic keys need dedicated CSPRNGs; never this tool.

## FAQs
### Can I get the same numbers twice?

Yes; every run is an independent draw; press calculate repeatedly until you like what you see.

### Why did unique mode fail?

You asked for more unique numbers than the range contains integers; widen the range or lower the count.

### Is this safe for passwords or keys?

No. Use a cryptographic random source for anything security-sensitive.

### Are the endpoints included?

Yes; minimum and maximum can both appear among the results.

## Related calculators
- [Factorial Calculator](https://codeasystem.com/calculators/math/factorial-calculator/)
- [Percentage Calculator](https://codeasystem.com/calculators/math/percentage-calculator/)
- [Exponent & Root Calculator](https://codeasystem.com/calculators/math/exponent-root-calculator/)

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Last updated: 2026-08-23 · Version: 1.0.0 · [HTML version](https://codeasystem.com/calculators/math/random-number-generator/)