Can the same number be generated more than once?

By default each pick is independent, so duplicates can occur across multiple numbers — the same way rolling a die twice can land on the same face twice. If you need a set of unique numbers (like a raffle draw), enable the no-duplicates option.

Is this good enough for a lottery or drawing winners?

For informal use like picking a raffle winner or a game, yes. It's not intended for high-stakes gambling or cryptographic use, since it relies on the browser's general-purpose random function rather than a certified RNG.

Random Number Generator

Generate random numbers within a range, with or without duplicates.

How this is calculated

Number = min + floor(random() × (max − min + 1))

Assumptions used in this calculation

Random source: Numbers are generated using the browser's Math.random(), a fast general-purpose PRNG that is not cryptographically secure.

About this calculator

The random number generator picks one or more random integers within a specified range, with an option to allow or disallow duplicate values.

Worked example

5 numbers between 1 and 100

Result: 5 random numbers

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About this calculator

Frequently asked questions

Can the same number be generated more than once?

Is this good enough for a lottery or drawing winners?

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