What is a random number generator?
A random number generator is an online tool that produces numbers within a specified range. You can usually enter a minimum and maximum value and generate one or more random numbers.
Random Number Generator
Create random numbers for games, samples, testing, or quick picks. Choose integers or decimals and generate up to 100 values at once.
Set your random number options
Define the range, how many numbers to generate, and whether you want integers or decimals.
About this calculator
How to use Random Number Generator, plus the formulas and logic behind the results.
Tool description
The Random Number Generator creates one or many random integers or decimals inside a chosen range for games, samples, raffles, and quick picks.
How to use
- Set the minimum and maximum values.
- Choose how many numbers to generate (1–100).
- Select integers or decimals and decimal places if needed.
- Select Calculate to generate a new set.
Formulas & reference
Uniform sample on [min, max]Integer mode rounds each sample to the nearest whole numberDecimal mode formats to the selected number of places
Random number tips
- Each click generates a new set
- Minimum may equal maximum
- Integers are inclusive of both bounds
- Use decimals for finer random values
Calculation logic
Each value is drawn with PHP’s pseudo-random generator scaled into the requested range. Results are suitable for casual use, not cryptography.
Numbers are generated using PHP pseudo-random functions. They are suitable for casual use, not cryptographic security.
Random Number Generator FAQ
Common questions about this calculator and how to use the results.
How does a random number generator work?
Most online random number generators use a computer algorithm to select values from a specified range. The algorithm is designed to produce an unpredictable sequence of numbers for general-purpose applications.
How do I generate a random number between two numbers?
Enter the minimum and maximum values into the random number generator. The tool will select a number within the specified range, including or excluding the endpoints depending on its settings.
How do I generate a random number between 1 and 100?
Set the minimum value to 1 and the maximum value to 100, then generate a number. The result will be an integer within that range.
Can I generate multiple random numbers at once?
Yes. If the random number generator supports multiple results, specify how many numbers you need and generate them together instead of running the tool repeatedly.
Can a random number generator generate unique numbers?
Some random number generators can generate unique numbers by preventing previously selected values from appearing again. This is useful when selecting random winners, numbers, or items without repetition.
Can I generate random numbers without duplicates?
Yes, when the generator provides a no-repeat or unique-number option. The selected range must contain enough possible values to generate the requested number of unique results.
How do I generate a random number between 1 and 10?
Enter 1 as the minimum and 10 as the maximum, then click the generate button. The tool will return a random integer from 1 through 10.
How do I generate a random number between 1 and 1000?
Set the minimum value to 1 and the maximum value to 1000. The generator can then select a random integer within that range.
Are random numbers really random?
Computer-generated random numbers are often produced using pseudorandom algorithms. They can appear random and are suitable for many everyday purposes, but they are not necessarily truly random in the physical sense.
Can I use a random number generator for games and contests?
Yes. A random number generator can be useful for games, classroom activities, contests, raffles, and other situations where you need to make a random selection.
Can I use a random number generator to pick a winner?
Yes. You can assign each participant a number and generate a random number within the participant range. The matching participant can then be selected as the winner.