Random Number Generator

Random number generators are fundamental tools in mathematics, statistics, computing, and everyday decision-making. From simulating dice rolls and card shuffles to statistical sampling, A/B testing, and cryptographic key generation, the need to produce unpredictable values appears across virtually every field.

This tool uses JavaScript's built-in Math.random() function, which implements a pseudo-random number generator (PRNG) based on an algorithm seeded from system entropy. While not suitable for cryptographic applications, it provides excellent randomness for all practical uses including simulations, games, sampling, and randomized testing.

The unique mode uses a Fisher-Yates shuffle to efficiently select non-repeating values from the range. Integer mode generates whole numbers within [min, max] inclusive, while decimal mode generates values in [min, max) rounded to 6 significant figures. All computation runs entirely in your browser — no data is sent to any server.

You may also find our Random String Generator, UUID Generator, and Permutation & Combination Calculator helpful.