Random Number Generator
Generate random numbers within any range you specify
How Random Numbers Work
About Random Number Generation
Random number generators (RNGs) create sequences of numbers that lack any pattern. This generator uses cryptographically secure randomness when available, ensuring fair and unpredictable results for games, drawings, and selections.
Each number in your specified range has an equal probability of being selected. If you generate 10 numbers between 1-100, each number has a 1% chance on each pick. With duplicates allowed, the same number can appear multiple times.
These random numbers are generated client-side in your browser using the Web Crypto API when available, falling back to Math.random(). They're suitable for games and casual use, though not for cryptographic purposes.
Common Uses
Dice & Games
Simulate dice rolls, card draws, or any game of chance. Set 1-6 for a die.
Raffles & Lotteries
Draw winning numbers or pick random winners from a list of entries.
Random Sampling
Select random participants for surveys or random items for testing.
Decision Making
Can't decide? Let random numbers choose between options for you.
Quick Presets
| Use Case | Min | Max | Quantity |
|---|---|---|---|
| Standard Die | 1 | 6 | 1 |
| Pair of Dice | 1 | 6 | 2 |
| Coin Flip | 1 | 2 | 1 |
| Lottery (1-49) | 1 | 49 | 6 (no dupes) |
| Playing Card | 1 | 52 | 1 |
| Percentage | 0 | 100 | 1 |
Tips for Fair Random Selection
Disable Duplicates for Draws
For raffles and lotteries, turn off duplicates so each number/person can only be selected once.
Document the Process
For important drawings, record the settings used and results for transparency.
Re-generate if Needed
If you need a new set, simply regenerate. Past results don't affect future generations.
Test First
Run a few test generations to ensure your settings produce the expected results.
Frequently Asked Questions
Are these numbers truly random?
They're pseudorandom, generated by algorithms seeded with unpredictable values. For games and everyday use, they're effectively random. For cryptographic security or high-stakes applications, specialized systems are required.
Can the same number appear twice?
Only if you allow duplicates. With duplicates disabled, each number can only appear once in your results—perfect for drawings where you need unique selections.
How do I pick a random item from a list?
Number your items 1 through N, then generate one random number in that range. The number corresponds to your selected item. Or generate multiple to pick multiple winners.
Is there a pattern to the numbers?
No discernible pattern. Each generation is independent of previous ones. The 'gambler's fallacy'—thinking a number is 'due'—doesn't apply. Each number has equal probability every time.
Pro Tips
- Bookmark this calculator for quick access in the future
- Use the share button to send your results to others
- Try different scenarios to compare outcomes
- Check out our related calculators for more insights
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