Random Number Generator
Generate random numbers instantly with custom ranges and advanced options
Set your range and press Generate to create random numbers.
Advanced Options
How to Use the Random Number Generator
Created & reviewed by Chad Solomon
Last reviewed 12 June 2026
A random number generator (RNG) creates unpredictable numeric values within a specified range. Our tool uses JavaScript's Math.random() to generate statistically uniform numbers for gaming, statistics, research, and decision-making applications.
Step-by-step instructions
- Set your minimum and maximum values to define the range
- Choose how many numbers you want to generate (1-1000)
- Select optional features like unique numbers or decimal format
- Click "Generate" to instantly create random numbers
- Copy results to clipboard with one click
Number Generator Features and Range Options
- ✓Uniform randomness using JavaScript's built-in Math.random() — evenly distributed across your range
- ✓No duplicates option for unique number generation
- ✓Multiple formats: integers, decimals, and percentages
- ✓Bulk generation up to 1,000 numbers at once
- ✓Statistics display showing sum, average, min, and max
- ✓No data storage - all generation happens in your browser
Common ranges
Random number generators produce sequences of numbers that lack predictable patterns. Our generator uses pseudo-random number generation (PRNG) via JavaScript's Math.random(), which creates numbers that are statistically uniform and suitable for most applications including gaming, statistics, and general randomisation needs.
Perfect for Gaming, Statistics & Decision Making
Gaming & Entertainment
- Dice rolls for board games (1-6)
- Lottery number selection
- Random spawn points in video games
- Loot drop calculations
Research & Statistics
- Statistical sampling (1-100)
- Monte Carlo simulations
- Random assignment in experiments
- Data analysis testing
Business & Education
- Random employee selection
- Quiz question order
- Raffle and giveaway winners
- Team assignments
Programming & Testing
- Test data generation
- UUID creation
- Random seed values
- Algorithm testing
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How the Random Number Generator Works
When you press Generate, the tool calls JavaScript's Math.random(), which returns a floating-point value uniformly distributed between 0 (inclusive) and 1 (exclusive). To scale that into an inclusive integer range, the formula used is Math.floor(Math.random() * (max - min + 1)) + min. Adding 1 before flooring ensures the upper bound is reachable with the same probability as every other value — so a range of 1–6 gives each outcome exactly a 1-in-6 chance, and a range of 1–100 gives each integer a 1-in-100 chance. There is no weighting or skew. For the decimal format, the tool skips the floor step and instead rounds to your chosen number of decimal places.
All generation runs entirely in your browser — nothing is sent to a server, and no result is ever stored. For full technical details on Math.random() distribution and implementation notes, see the MDN documentation for Math.random().
Example Random Number Results
Here are three results from this tool across different ranges, showing what you can expect in practice:
- Range 1–6, result: 4 — simulating a standard six-sided die; useful for board games or tabletop RPG mechanics where you need a quick roll without physical dice.
- Range 1–100, result: 73 — a percentage-style draw; commonly used for statistical sampling, prize draws, or deciding a percentage chance outcome (e.g. "73% — you succeed").
- Range 1–45, generating 6 unique numbers: 3, 11, 22, 29, 37, 44 — mimicking a lottery draw; enabling the "No duplicates" option ensures no number repeats, just as in a real lottery barrel.
Common Ranges at a Glance
The table below shows frequently used ranges, how many distinct values they contain, and the probability of any single value being drawn — useful for understanding fairness across different use cases.
| Range | Possible values | Chance of any one value |
|---|---|---|
| 1 – 2 | 2 | 50.0% |
| 1 – 6 | 6 | 16.7% |
| 1 – 10 | 10 | 10.0% |
| 1 – 20 | 20 | 5.0% |
| 1 – 45 | 45 | 2.2% |
| 1 – 100 | 100 | 1.0% |
| 0 – 255 | 256 | 0.4% |
| 1 – 1000 | 1 000 | 0.1% |
Frequently Asked Questions
Q.Is this random number generator truly random?
Our generator uses JavaScript's Math.random() function, which is a pseudo-random number generator (PRNG). The results are statistically uniform and unpredictable in practice, making them suitable for games, raffles, and sampling. For cryptographic or security purposes, use a dedicated cryptographic tool such as the Web Crypto API instead.
Q.Are the minimum and maximum values inclusive?
Yes — both bounds are included in the possible results. If you set a range of 1 to 6, the tool can return any of 1, 2, 3, 4, 5, or 6, each with equal probability.
Q.Can I generate decimal or floating-point numbers?
Yes. Open "Advanced Options" and select the "Decimal" format. You can specify between 1 and 10 decimal places. The tool skips the floor step and rounds to your chosen precision instead of returning a whole number.
Q.How many random numbers can I generate at once?
You can generate up to 1,000 random numbers in a single click. For larger datasets, simply generate multiple batches and combine the results.
Q.What does the "No duplicates" option do?
When enabled, each number in a batch is guaranteed to be unique — no value will repeat within that result set. This is useful for lottery draws or sampling without replacement. Note that you cannot request more unique numbers than there are integers in your range.
Q.Can I generate negative numbers?
Yes. Simply enter a negative value in the Minimum field (for example, −50) and the tool will generate integers across that range, including negative values.
Q.Are the generated numbers stored or tracked?
No. All number generation happens locally in your browser. We do not store, track, or have access to any numbers you generate, ensuring complete privacy.