Random Number Generator: Create Numbers Within Any Range
Generate random numbers within any custom range. Perfect for lotteries, games, sampling, software testing, and statistical experiments. Free and instant.
February 8, 2026
Generate Random Numbers Instantly
Our random number generator lets you create random numbers within any range you define. Set a minimum and maximum value, and get a truly random result in milliseconds. Whether you need a number between 1 and 10 or between negative one million and positive one million, our tool handles it all with ease.
How Random Number Generation Works
Random number generation in computers relies on algorithms that produce sequences of numbers with no discernible pattern. There are two main categories:
Pseudo-Random Number Generators (PRNGs)
Most software random number generators are technically pseudo-random. They use mathematical algorithms seeded with an initial value to produce sequences that appear random. While not truly unpredictable, modern PRNGs like the Mersenne Twister produce output that passes rigorous statistical tests for randomness.
Cryptographically Secure Random Number Generators (CSPRNGs)
For applications requiring higher security, such as encryption keys and passwords, cryptographically secure generators are used. These leverage hardware entropy sources like mouse movements, keyboard timing, and system noise to produce truly unpredictable values. Our tool uses the browser's crypto.getRandomValues() API when available, providing cryptographic-grade randomness.
Use Cases for Random Numbers
Lotteries and Drawings
Running a raffle, lottery, or giveaway? A random number generator ensures fair and unbiased selection. Simply assign numbers to participants and let the generator pick the winner. This eliminates any possibility of favoritism or manipulation.
Games and Entertainment
Board games, party games, and video games all rely on randomness. Use our tool to generate dice rolls, draw random cards, select random players, or create unpredictable game events. The instant results keep the game flowing smoothly.
Statistical Sampling
Researchers and analysts use random numbers to select unbiased samples from populations. Whether conducting a survey, performing quality control, or running a scientific experiment, random sampling ensures that every member of the population has an equal chance of being selected.
Software Testing
Developers use random numbers to generate test data, stress test applications, and verify edge cases. Random input helps uncover bugs that deterministic testing might miss. It is a critical tool in quality assurance and fuzzing.
Education
Teachers use random number generators for classroom activities like selecting students, creating math problems, or demonstrating probability concepts. Students can run experiments to observe the law of large numbers and understand statistical distributions.
Custom Min and Max Ranges
Our generator supports any integer range you specify. Common configurations include:
- 1 to 10 — Classic small range for simple decisions
- 1 to 100 — Percentile-style random selection
- 1 to 1000 — Raffle-style number generation
- 0 to 1 — Binary random choice
- Negative ranges — Full support for negative numbers
Fair and Private
Our random number generator runs entirely in your browser. No numbers are sent to any server, ensuring complete privacy. The results are generated instantly using your device's random number capabilities, making the tool both fast and secure. Try it now and get the random number you need in seconds.