Random Number Generator
Generate random numbers in a range. Integer or decimal, custom count. Free online RNG.
How to Use
Enter your values in the fields above and click Calculate to get instant results. All computations run locally in your browser. No data is ever uploaded or stored.
Related Calculators
Cryptographic Random Number Generation
CalcSolver's random number generator uses crypto.getRandomValues() — a browser-native cryptographic API that produces truly unpredictable numbers, unlike Math.random() which uses a deterministic algorithm. This makes it suitable for security-sensitive applications like generating temporary codes or lottery selections.
Specify your range (minimum and maximum) and the number of values needed. The generator produces unique numbers within your range — no duplicates. Common uses include: classroom random selection, lottery number generation, statistical sampling, and games that need fair random outcomes.
For password generation, use CalcSolver's dedicated password generator which combines cryptographic randomness with character set selection. For statistical simulations requiring large datasets, the random number generator can produce hundreds of values in a single click. See our standard deviation calculator for analyzing random datasets.
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Frequently Asked Questions
How does the random number generator work?
Our generator uses the Web Crypto API to produce cryptographically secure random numbers. This provides better randomness than standard Math.random() used by many other tools.
Can I generate multiple random numbers at once?
Yes, you can specify how many random numbers to generate and set a range (minimum and maximum). The numbers are generated independently.
Are these numbers truly random?
The Web Crypto API uses hardware-level entropy sources for randomness. While technically pseudorandom, the output is cryptographically secure and suitable for any purpose except one-time pad encryption.