The Random Number Generator produces truly random integers within any range you specify. Generate a single number or a list of up to 100 numbers — with an option to ensure all numbers in the list are unique.

How to Use This Calculator

1. Single Number: Enter a Min and Max, click Generate.
2. Multiple Numbers: Switch to the Multiple tab, enter range and count, check “Unique” if you don’t want repeats, and click Generate.

Uses for a Random Number Generator

• Picking winners: Assign numbers 1–N to each entrant and generate a random number.
• Decision making: Can’t decide between options? Number them and let the RNG decide.
• Games and simulations: Simulate dice rolls, card draws, or random events.
• Statistical sampling: Pick a random subset of items from a list.
• Classroom use: Randomly call on students, randomize quiz question order, or create random groups.

Is Math.random() Truly Random?

Not cryptographically. Math.random() is a pseudorandom number generator (PRNG) — it produces a sequence that looks random but is deterministic. For casual use (games, decisions, sampling), it is perfectly adequate. For security purposes (generating keys or passwords), use crypto.getRandomValues() — which our Password Generator uses.

Frequently Asked Questions

Can I get duplicate numbers in the list?

By default, yes. Check the “Unique” checkbox to prevent duplicates. Note: you cannot generate more unique numbers than exist in the range (e.g., you can’t get 5 unique numbers from a range of 1–3).

What is the maximum range I can use?

Any range supported by JavaScript integers. For practical purposes, you can use any range within the safe integer limit of ±9,007,199,254,740,991.

How the Random Numbers Are Generated

This generator uses your browser’s built-in pseudo-random number generator to produce values within the range you specify. The numbers are uniformly distributed, meaning every value between your minimum and maximum is equally likely. Because the calculation happens entirely in your browser, no data is sent anywhere — the result is private to you.

Common Uses

• Giveaways & raffles: Pick a fair winner from a numbered list of entrants.
• Games: Generate dice-like rolls, lottery numbers, or random turns.
• Sampling: Select random rows or participants for surveys and testing.
• Decision making: Settle a choice impartially when options are numbered.
• Education: Demonstrate probability and randomness in the classroom.

Pseudo-Random vs True Random

Standard generators like this one are pseudo-random: they use a mathematical formula that produces sequences which look random and are perfect for games, draws, and everyday sampling. True random numbers — derived from physical sources such as atmospheric noise — are only necessary for security-critical uses like cryptography. For picking a winner or rolling dice, a pseudo-random generator is more than sufficient.