Generating...
Choose a number type, set the range, and click Generate to create your random list.
What Is a Random Number Generator?
A random number generator produces numbers that have no predictable pattern. It is useful for games, raffles, statistical sampling, simulations, password generation, and testing. This tool lets you generate integers or decimals in any range, control whether duplicates are allowed, sort the output, and copy the list instantly.
Each number is picked using a uniform distribution, which means every value in the chosen range has an equal chance of appearing. You can generate a single number or a list of up to 10,000 values.
How to Generate Random Integers in a Range
Set the mode to Integers, enter a minimum and maximum, and choose how many numbers you want. The generator picks whole numbers between the bounds, including both endpoints. If you choose unique numbers, no value will appear twice in the list.
For example, a die roll is the same as generating one integer from 1 to 6. A lottery draw is the same as generating several unique integers from a larger pool.
How to Generate Random Decimals
Set the mode to Decimals, choose the range, choose how many decimal places you want, and generate. The tool rounds every value to the requested precision. You can use this for random prices, random coordinates, or any scientific simulation that needs fractional values.
With or Without Duplicates
Allowing duplicates is the right choice when each number should be independent, like repeated dice rolls. Choosing unique numbers is better when you are drawing winners or picking a random sample where the same item cannot appear twice. The tool checks whether the range is large enough for the requested count of unique values.
Visual Example
Five random points spread uniformly across the range 1 to 100.
Common Use Cases for Random Numbers
- Dice rolls, coin flips, and card draws
- Lottery numbers and raffle winners
- Random samples for surveys or experiments
- Mock data for testing software
- Random passwords or PINs (integers only)
- Simulations and Monte Carlo methods
Random Number Generator FAQ
What is a random number generator? +
A random number generator is a tool that produces one or more numbers without a predictable pattern. The numbers are usually drawn from a uniform distribution so every value in the range has the same chance of appearing.
How do I generate a random number between 1 and 100? +
Set the mode to Integers, enter 1 as the minimum and 100 as the maximum, set the count to 1, and click Generate. The tool returns a whole number between 1 and 100 inclusive.
Can I generate numbers without duplicates? +
Yes. Choose the Unique option. The generator will make sure no value appears twice in the result. If the range is too small for the requested count, it will show an error.
What is the difference between integers and decimals? +
Integers are whole numbers with no fractional part, such as 7 or 42. Decimals include fractional parts, such as 3.14 or 0.75. Choose decimals when you need values between whole numbers.
How many numbers can I generate at once? +
You can generate up to 10,000 numbers in a single request. Larger lists are useful for mock data and sampling, while smaller lists are better for raffles and dice rolls.
Are the numbers truly random? +
The generator uses a pseudo-random algorithm seeded from the current time. It is random enough for games, sampling, and testing, but it is not cryptographically secure and should not be used for encryption or high-stakes security.
External Resources
Authoritative references for randomness and probability.
Related Calculators
Binomial Distribution Calculator
Exact, cumulative, and complementary binomial probabilities.
Normal Distribution Calculator
Bell curve probabilities and inverse normal values.
Percentage Calculator
Percent of a number, percentage change, and more.
Fraction Calculator
Add, subtract, multiply, and divide fractions with steps.