Random Number Generator
Generate random numbers in any range, with or without repeats.
Inputs
Formula
- n = min + floor(random × (max − min + 1))
Draws use the browser's pseudo-random generator, so nothing is sent to a server. Recalculate to draw again — ideal for giveaways, team picks, lucky dips and test data.
Step-by-step calculation
- 1
Draw
uniform random in range
5 values
Frequently asked questions
What does the Random Number Generator do?
Generate random numbers in any range, with or without repeats. The Random Number Generator on OneCalcApp returns the result instantly as you type, together with the formula and the substituted values.
How do I use the Random Number Generator?
Enter your values in the input fields, choose the relevant units or options, and the Random Number Generator recalculates automatically. You can copy, print or export the result.
Is the Random Number Generator free to use?
Yes. The Random Number Generator is completely free, needs no sign-up and has no usage limit on OneCalcApp.
How accurate is the Random Number Generator?
It uses the standard formula n = min + floor(random × (max − min + 1)) and full double-precision arithmetic, so results match a manual calculation to the displayed number of digits.
Does the Random Number Generator work on mobile and offline?
Yes. The Random Number Generator runs entirely in your browser on phones, tablets and desktops, and your inputs never leave your device.
Where can I find related tools?
OneCalcApp hosts 300+ calculators and converters, including the full Lifestyle collection. Related tools are linked at the bottom of every page.
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