Random Number Generator

Set a minimum and maximum, choose integers or decimals, then generate one number or a short list. Each press of Generate draws a new sample.

How it works

Integers are chosen uniformly from the inclusive range. A draw from 1 to 4 can be 1, 2, 3 or 4. Decimals are taken from the half-open interval [min, max).

The generator uses the browser’s Math.random — suitable for raffles, classroom examples and games, not for cryptography or lotteries that need a documented entropy source.

If you ask for integers but the range contains none (for example 1.2 to 1.4), there is no result.

Formula

Integer: uniform choice from ceil(min) through floor(max), inclusive
Decimal: min + u × (max − min), where u is a random value in [0, 1)

Worked examples

A die roll
integers from 1 to 6, count 1 → one of 1, 2, 3, 4, 5 or 6
Three classroom numbers
integers from 1 to 30, count 3 → three integers in that range

Useful notes

Results do not update as you type — press Generate so a new sample is intentional.
Count must be between 1 and 100.

FAQ

Are the numbers truly random?: They are pseudo-random numbers from the browser. That is fine for everyday picks. Do not use this page for security tokens or official drawings.
Is the range inclusive?: For integers, yes — both ends can appear. For decimals, the minimum can appear and the maximum is the exclusive upper bound.
Do the numbers leave my browser?: No. Generation runs locally and is not uploaded.

Related tools

See all Math tools.