Math & Scientific
Random Number Generator
Random Number Generator is a browser-based calculator tool on CalcToolsBase. Free, browser-based Random Number Generator with instant, clearly-labelled results. No signup, no uploads. To use it, enter your values and view the result directly in your browser — no signup and nothing to install.
Give Random Number Generator a minimum, a maximum and how many numbers and it returns a random result each time straight away. Built to get an unbiased random outcome, it runs entirely on your device.
About this calculator
Random Number Generator exists to get an unbiased random outcome with the least fuss. From a minimum, a maximum and how many numbers it derives a random result each time using a fair random pick, all on your device. There are no accounts, no adverts in the result, and nothing leaves your browser.
For anyone who needs to decide or pick fairly, it turns the calculation into a quick, repeatable check and presents a random result each time plainly. Everything is computed locally, so your figures stay on your machine.
How to use
- Enter the minimum and maximum of the range.
- Enter how many numbers to generate.
- Press Calculate to generate the numbers.
- Read the generated numbers and the range used.
Why use Random Number Generator
Fast
Calculations run in your browser. No round trip to a server.
Private
Your inputs never leave your device. Nothing is uploaded.
Free
No signup, no paywall, no ads-in-results, no watermarks.
Accurate
Uses fair pseudo-random generation for casual use, not security or official lotteries.
Mobile-ready
Optimised for phones, tablets, and desktops alike.
Transparent
Honest disclaimers wherever browser limits or regional rules apply.
Common uses
Random Number for picking a random winner
Random Number in raffles and giveaways
Random Number when settling a friendly dispute
Random Number in simulations and demos
Random Number when you need an unbiased pick
Random Number for team and group selection
Technical notes
Random Number Generator draws a uniform pseudo-random integer in your chosen range using the browser's generator.
Each result is independent and uses the browser's built-in randomness, so don't rely on it where secure or certified randomness is required.
Because it runs locally, results appear instantly with no server round-trip.
FAQ
Are the numbers cryptographically secure?
No. They use your browser's pseudo-random generator, which is good for everyday and casual use but not for security or cryptography.
Can numbers repeat?
Yes. Each number is drawn independently, so the same value can appear more than once in the list.
What if the minimum is larger than the maximum?
The generator will ask you to fix the range, because the maximum must be at least the minimum.
Does the Random Number Generator send my data to a server?
No. The Random Number Generator runs entirely in your browser, so nothing you enter is uploaded, stored, or shared.
Worked example
Asking for a number between 1 and 100 returns each value with equal probability — useful for draws, sampling, or breaking ties.