Random Number Generator: Generate Numbers in Range
Random number generator online: generate random numbers in custom ranges like 1-10 or 1-100, with unique and decimal options.
Updated 2026-08-16
Related Tools
UUID Generator: v4 & All Versions, Validate & Decode Online
Password Generator: Strong Random Passwords 12-64 Chars
Barcode Generator: Create Barcodes for Products Online
QR Code Generator Online: Create QR for URL, Text, WiFi
QR Code Decoder: Read QR Codes from Photos & Images Online
Age Calculator: Exact Age by Date of Birth, Years & Days
Features
- Generate random numbers in any custom range: like 1-10, 1-100, or -10 to 10, endpoints included
- Support for integers and decimals: decimals keep a fixed number of decimal places
- Generate up to 1,000 numbers at once
- Unique (non-repeating) numbers: each value appears at most once, ideal for lottery draws
- Control decimal places from 0 to 10 for precise float output
- Instant generation with one click: regenerate as many times as you need
- For games, raffles, giveaways, and random sampling
- Evenly distributed across the range: suitable for basic simulations
- Negative values supported: set a negative minimum like -10
How to Use
- 1Enter the minimum value of the range.
- 2Enter the maximum value of the range.
- 3Choose how many numbers to generate.
- 4Select whether to allow decimals.
- 5Enable unique numbers if needed.
- 6Click generate to get your random numbers.
- 7For lottery-style drawings: set the range (e.g., 1-49), enable 'Unique' to prevent repeats, and set the count to the number of balls needed (e.g., 6). Click Generate for your random selection instantly.
- 8For precise decimal values in simulations: enable 'Allow decimals' and specify the number of decimal places (1-10). The generator produces evenly distributed floats within your range, suitable for statistical modeling and Monte Carlo simulations.
Frequently Asked Questions
How random are the generated numbers?
The generator uses JavaScript's Math.random(), which produces pseudo-random numbers: they pass statistical randomness tests and are sufficiently random for games, raffles, sampling, and simulations, but they are not cryptographically secure. For gambling fairness requirements or cryptographic purposes, use a dedicated secure random generator like crypto.getRandomValues() instead.
What does 'unique numbers' mean?
When enabled, each generated number will be different. For example, generating 5 unique numbers from 1-10 will never repeat a number. This is useful for lottery-style drawings or sampling without replacement.
How many unique numbers can I generate?
For integers, the maximum is the range size (max - min + 1). For decimals, it's limited to 100,000 to prevent browser freezing. If you request more than possible, the generator will produce the maximum available.
Can I generate negative numbers?
Yes. Set a negative minimum value. For example, min: -10, max: 10 will generate random numbers between -10 and 10, including negative numbers.
What's the difference between integers and decimals?
Integers are whole numbers (1, 2, 3). Decimals include fractional parts (1.5, 2.73). You can control the number of decimal places (1, 2, or more). Integers are faster and better for games; decimals are better for simulations.
How do I use this for a raffle or giveaway?
Set minimum to 1 and maximum to the number of participants. Set count to the number of winners needed. Enable 'Unique' so the same person cannot win twice. Click Generate to pick winners instantly. The results are random and unbiased, perfect for fair drawings.
Can I generate random numbers for statistical sampling?
Yes. The generator produces uniformly distributed numbers suitable for basic statistical sampling, Monte Carlo simulations, and A/B test group assignments. For scientific research requiring cryptographically secure randomness or specific probability distributions, use a specialized statistical package.
How do I generate a random number between two specific values?
Enter the minimum value in the 'Min' field and the maximum in the 'Max' field. The generator produces random numbers within this inclusive range. For example, min=5, max=15 generates numbers between 5 and 15, including both endpoints. Negative values are also supported.
What happens if I request more unique numbers than available?
The generator automatically limits the output to the maximum possible unique values. For integers, this equals the range size (max - min + 1). If you request 100 unique numbers from a range of 1-10, you will receive 10 unique numbers with a notification explaining the limit.
Why do I get the same number multiple times?
Repeated numbers are normal when the unique option is off; each draw is independent, so the same value can appear again. For a raffle or giveaway where each entry should be drawn once, turn on the unique numbers option. For small ranges, repeats become more likely, which is expected in random draws.
Why is my raffle result not fair?
Check two things: first, the range must cover every entry exactly once (1 to N for N entries), and every draw must be independent. Second, this tool uses JavaScript's Math.random(), a pseudo-random generator (the same quality most online raffle and wheel tools use), which is fine for fair prize drawings. It is not cryptographically secure, so for use cases where randomness must be defensible (e.g., regulated draws or cryptographic keys), use crypto.getRandomValues() instead.
Can I use this as a random number wheel for 1-10 or 1-100 draws?
Yes, set Min to 1 and Max to 10 (or 100) and click Generate. The result is the same uniform random pick a spinning wheel makes, just without the animation. For a group drawing, enable 'Unique' so no entry is picked twice. If you specifically need the visual spinning effect for a live event, any online wheel tool runs the same selection math underneath.
Why do my random numbers look like a pattern (e.g., 1, 2, 3, 4)?
Human brains hunt for patterns, and short sequences can look ordered by pure chance: drawing 1, 2, 3, 4 in a row from 1-10 has exactly the same 1/10,000 probability as any other specific four-number sequence. Each draw is independent, so earlier results never influence later ones; repeats and near-sequences are normal when 'Unique' is off. Over a large number of draws the distribution evens out, which is what 'random' actually means.