Number Generator (RNG)
Generate random numbers within any range, as unique sets or sequences, with sorting and sum statistics.
Random Number Generator (RNG): Unbiased Integer & Decimal Randomizer
From running scientific statistical simulations, raffle drawings, and lottery number selections to resolving tabletop RPG dice rolls and board game decisions, an accurate, unbiased random number generator is critical. Our Random Number Generator (RNG) provides true uniform distribution across custom minimum and maximum bounds.
Generate single numbers, batches of unique non-repeating numbers, or floating-point decimals with millisecond precision. Supported by cryptographic entropy sources via the Web Crypto API, our RNG tool eliminates bias and guarantees fair sampling every time you hit Spacebar.
True Uniform Sampling
Every integer within your specified range has an exactly equal mathematical probability of selection.
Bulk Batch Generation
Generate up to 1,000 numbers in a single roll, with options to sort ascending, descending, or keep roll order.
No Duplicates Mode
Guarantee unique numbers without replacement for lottery draws, bingo cards, and raffle ticket picks.
Spacebar Quick Trigger
Tap Spacebar to roll instantly. Track history rolls, calculated averages, minimums, and maximums in real time.
📊Popular RNG Ranges & Practical Applications
| Preset / Range | Bounds | Primary Use Case | Duplicate Setting |
|---|---|---|---|
| 1 to 100 | Min: 1, Max: 100 | Percentage rolls, classroom giveaways, game loot tables | Allow or Unique |
| 1 to 6 (Standard Die) | Min: 1, Max: 6 | Monopoly, Yahtzee, Ludo, classic board games | Allow Duplicates |
| 1 to 20 (D20 RPG) | Min: 1, Max: 20 | Dungeons & Dragons skill checks, critical hits | Allow Duplicates |
| 1 to 50 / 1 to 75 (Lottery/Bingo) | Min: 1, Max: 75 | Bingo caller, Mega Millions / Powerball number picker | Unique Only |
| 0 to 1 (Binary / Coin) | Min: 0, Max: 1 | 50/50 binary decisions, boolean flag simulation | Allow Duplicates |
❓Frequently Asked Questions
Is this random number generator truly random and unbiased?▾
Yes. Our generator uses cryptographic random entropy (crypto.getRandomValues) to generate numbers with a mathematically uniform distribution. Unlike basic pseudo-random generators with short cycles, every integer has an equal, unbiased probability of being drawn.
Can I generate multiple non-repeating numbers for a raffle or lottery?▾
Yes! Enable the "Unique Numbers Only" option and specify the quantity of numbers you need. The generator uses the Fisher-Yates sampling algorithm to guarantee no duplicate numbers appear in the batch.
Can I set negative numbers or custom decimal places?▾
Yes. You can enter negative values (e.g. Min: -50, Max: +50) and toggle between whole integers and floating-point decimal precision (1 to 4 decimal places) for scientific or statistical modeling.
How do I copy the generated numbers into Excel or Google Sheets?▾
Click the "Copy Results" button to copy your numbers formatted as comma-separated or newline-separated values. You can paste them directly into spreadsheet cells or statistical software like R, Python pandas, and SPSS.
Are my results recorded or logged on a server?▾
No. All computations occur client-side in your local web browser. Your inputs, generated numbers, and roll histories are private and never uploaded to any external server.
What is the difference between PRNG and TRNG?▾
A PRNG (Pseudo-Random Number Generator) uses mathematical algorithms with an initial seed value to produce sequences that appear random. A TRNG (True Random Number Generator) measures physical environmental entropy (e.g. atmospheric noise or quantum radioactive decay). Our CSPRNG implementation bridges both by harvesting hardware entropy from your device.