How to use the Random Number Generator
- Enter the smallest and largest number allowed.
- Choose how many numbers to draw.
- Tick "No repeats" for a draw where each number can only win once.
- Click Generate. Click again for a new draw.
Formula used
Each number is chosen uniformly using crypto.getRandomValues with rejection sampling, so every value in the range has exactly the same chance.
Frequently asked questions
Is this truly random?
It uses the browser's cryptographically secure generator, which is suitable for draws and games. It is not a certified lottery system.
How do I pick a winner from a list of names?
Number your list, then generate one number between 1 and the number of names.
Can I roll dice?
Yes. Set minimum 1 and maximum 6, with repeats allowed and "How many" set to the number of dice.
What is the largest range?
Any whole numbers up to about 9 quadrillion, but no-repeat draws are limited to 10,000 numbers at a time.
Can I generate decimals?
Not directly. Generate whole numbers and divide, for example 1 to 1000 then divide by 100.
Our team builds and tests every tool by hand, checks each formula against official sources (IRS, HMRC, the Income Tax Department of India, CBSE, NHS, WHO) and reviews pages whenever rules change. Last reviewed on . Spotted a mistake? Tell us.