Random Number Generator
Generate random numbers, sequences, and lists with customizable ranges and options. Perfect for games, simulations, sampling, and statistical analysis.
Generator Settings
Quick Presets
Generated Results
How Random Number Generation Works
Pseudorandom Numbers
This calculator uses JavaScript's built-in Math.random() function, which generates pseudorandom numbers using a deterministic algorithm.
While not truly random, these numbers are sufficiently random for most applications including games, simulations, and statistical sampling.
The algorithm ensures uniform distribution, meaning each number in the specified range has an equal probability of being selected.
Generation Methods
Common Use Cases
Gaming & Entertainment
- • Dice rolling for board games
- • Lottery number selection
- • Random team assignments
- • Prize drawings and contests
- • Game character stats
Research & Analysis
- • Statistical sampling
- • Survey participant selection
- • A/B testing groups
- • Monte Carlo simulations
- • Data anonymization
Security & Passwords
- • Password generation
- • PIN code creation
- • Session tokens
- • Verification codes
- • Cryptographic seeds
Frequently Asked Questions
Are the numbers truly random?
The numbers are pseudorandom, generated by a deterministic algorithm. While not truly random like quantum processes, they're sufficiently random for most practical purposes and pass standard randomness tests.
Can I generate the same sequence twice?
Each generation uses a different seed based on the current time, so generating the exact same sequence is extremely unlikely. However, you can save your results for future reference.
What's the maximum range for numbers?
JavaScript can safely handle integers up to 2^53 - 1 (about 9 quadrillion). For most practical purposes, any reasonable range will work fine.
How do I ensure unique numbers?
When generating multiple numbers, uncheck "Allow duplicates" to ensure all generated numbers are unique. Note that the range must be large enough to accommodate the requested count.