Random Number Generator

Generate random integers and decimal numbers

Simple Random Number Generator

Generate a random integer between any two numbers

Your Random Number:

0

Comprehensive Random Number Generator

Generate one or many random integers or decimals with advanced options

Maximum: 10,000
Maximum: 3

Your Random Number:

0

About Random Number Generator

Our random number generator is a powerful tool that can create random integers and decimal numbers within any specified range. Whether you need a single random number or thousands of them, our generator provides fast, reliable results for any application.

Generator Features

Simple Random Number Generator: Quickly generate a single random integer between any two numbers. Perfect for quick picks, dice rolls, and simple randomization needs. This generator can handle very large integers up to a few thousand digits.
Comprehensive Random Number Generator: Advanced generator that can create one or many random integers or decimals with precision up to 3 decimal places. Includes options for generating unique numbers (no duplicates) and can produce up to 10,000 numbers at once.

How to Use the Random Number Generator

Simple Generator:

  • Enter your minimum value (the lowest possible number)
  • Enter your maximum value (the highest possible number)
  • Click "Generate Random Number"
  • Your random integer will be displayed

Comprehensive Generator:

  • Enter your minimum and maximum values (can be decimals)
  • Specify how many random numbers you want to generate (1-10,000)
  • Set the number of decimal places (0 for integers only)
  • Optionally check "Unique Numbers Only" to prevent duplicates (integers only)
  • Click "Generate Random Numbers"
  • Copy all numbers to clipboard if needed

Common Use Cases

Random number generators are useful for countless applications:

  • Games and Gaming: Dice rolls, card draws, random events, loot drops
  • Lottery and Raffles: Drawing winners, picking numbers, fair selection
  • Research and Statistics: Random sampling, experimental design, data analysis
  • Education: Creating practice problems, quiz questions, random assignments
  • Password Generation: Creating random numeric components for passwords
  • Simulation: Monte Carlo simulations, modeling random events
  • Cryptography: Generating initialization vectors (use hardware RNG for security)
  • Art and Music: Creating random patterns, generative art
  • Decision Making: Random selection when choices are equal
  • Testing: Generating test data, stress testing applications

What is a Random Number?

A random number is a number chosen from a pool of limited or unlimited numbers that has no discernible pattern for prediction. The pool of numbers is almost always independent from each other. However, the pool of numbers may follow a specific distribution.

For example, the height of students in a school tends to follow a normal distribution around the median height. If the height of a student is picked at random, the picked number has a higher chance to be closer to the median height than being classified as very tall or very short.

The random number generators on this page assume that the numbers generated are independent of each other, and will be evenly spread across the whole range of possible values.

Types of Random Number Generators

Hardware-Based Random Number Generators:

Hardware-based random number generators can involve the use of a dice, a coin for flipping, or many other physical devices. True random numbers are based on physical phenomena such as atmospheric noise, thermal noise, and other quantum phenomena. These methods generate truly random numbers.

Pseudo-Random Number Generators:

A pseudo-random number generator is an algorithm for generating a sequence of numbers whose properties approximate the properties of sequences of random numbers. Computer-based random number generators are almost always pseudo-random number generators.

Yet, the numbers generated by pseudo-random number generators are not truly random. Our generators above are also pseudo-random number generators. The random numbers generated are sufficient for most applications yet they should not be used for cryptographic purposes.

Understanding Unique Numbers

When you enable the "Unique Numbers Only" option, the generator ensures that no number appears more than once in your results. This is particularly useful for:

  • Lottery number generation (each number can only be drawn once)
  • Randomly assigning people to groups without overlap
  • Creating shuffled sequences
  • Fair distribution without replacement

Note: The unique option only works with integers. Also, ensure your range is large enough for the quantity of numbers you want. For example, you cannot generate 100 unique numbers between 1 and 10.

Decimal vs. Integer Generation

Integers (0 decimal places): Whole numbers like 1, 2, 3, 42, 100. Perfect for dice rolls, counting, selections, and most everyday randomization needs.
Decimals (1-10 decimal places): Numbers with fractional parts like 3.14, 7.5, 42.123456. Useful for scientific simulations, statistical sampling, and precise measurements.

Practical Examples

Example 1 - Dice Roll:
Min: 1, Max: 6
Result: Random integer between 1 and 6
Simulates a standard 6-sided die
Example 2 - Lottery Numbers:
Min: 1, Max: 49, Quantity: 6, Unique: Yes
Result: 6 unique numbers for lottery picks
Common lottery format (6 numbers from 1-49)
Example 3 - Random Percentage:
Min: 0, Max: 100, Decimals: 2
Result: Random percentage like 73.45%
Useful for probability simulations
Example 4 - Test Data:
Min: 1, Max: 1000, Quantity: 100
Result: 100 random numbers for testing
Generate sample data for software testing

Tips for Using Random Number Generators

Tip 1: When generating large quantities of unique numbers, make sure your range is sufficient. The range (max - min + 1) must be at least equal to the quantity requested.
Tip 2: For cryptographic purposes or high-security applications, use hardware random number generators or cryptographically secure pseudo-random number generators (CSPRNG).
Tip 3: The generator can handle very large numbers, including negative numbers. Simply enter your desired range with any valid numbers.
Tip 4: Use decimal places for scientific simulations that require precision, but stick with integers (0 decimals) for most everyday applications.

Randomness and Fairness

Our random number generator uses JavaScript's built-in Math.random() function, which provides uniformly distributed random numbers. This means every number in your specified range has an equal probability of being selected, ensuring fairness for:

  • Games and contests
  • Random drawings and raffles
  • Statistical sampling
  • Fair distribution of resources

Limitations and Considerations

While our random number generator is suitable for most applications, please note:

  • Generated numbers are pseudo-random, not truly random
  • Not suitable for cryptographic or security-critical applications
  • Maximum of 10,000 numbers per generation
  • Maximum of 10 decimal places for precision
  • Unique number generation only works with integers

Frequently Asked Questions

Are the numbers truly random?

No, they are pseudo-random. The numbers are generated using an algorithm that produces results statistically similar to true random numbers, which is sufficient for most applications like games, raffles, and statistical sampling.

Can I use this for lottery or gambling?

Yes, our generator is suitable for personal lottery number selection, friendly games, and casual gambling. However, it should not be used for commercial gambling operations or official lotteries.

What's the maximum number I can generate?

The generator can handle very large numbers (up to a few thousand digits) for the simple generator. However, extremely large numbers may affect display and performance.

Can I generate negative random numbers?

Yes! Simply enter negative values for your minimum and/or maximum values. For example, min: -100, max: 100 will generate numbers across positive and negative ranges.

Why can't I generate unique decimal numbers?

The unique option only works with integers because the probability of generating duplicate decimal numbers (especially with multiple decimal places) is extremely low. For decimals, duplicates are already very unlikely.

Privacy and Security

All random number generation is performed directly in your browser using JavaScript. We do not store, collect, or transmit any generated numbers. Your random numbers remain completely private on your device.

Mobile Friendly

Our random number generator is fully responsive and works perfectly on all devices including smartphones, tablets, and desktop computers. Generate random numbers on the go, anytime, anywhere!