Calculators / TOOLKIT
Random Number Generator
Draw from an inclusive range, with up to 100 results and 0–3 decimal places.
Free to use · No account needed
How to use
- Set the minimum and maximum range.
- Choose how many numbers and whether you want integers or decimals.
- Uncheck "Allow duplicates" for unique numbers (e.g. lottery-style draws).
- Click Generate, then copy individual results or the whole batch.
Values are sampled from an evenly spaced decimal grid inside your bounds. For example, 1.01–1.09 at one decimal place has no eligible value. Scaled bounds must fit within ±9,007,199,254,740,991; reduce the range or precision if requested.
Use cases
1. Use case: Run a giveaway Pick a random winner between 1 and the number of entries, or draw several unique numbers for prizes.
2. Use case: Random sampling Generate a random sample of IDs from a range for testing or statistics without bias.
Practical tips
Unique mode samples without replacement and reports when the available values are fewer than requested. Work is limited to the number of results, even for large intervals. The random source is Web Crypto; this utility is for picks and demonstrations, not key or token generation. Input processing happens in this browser.
Common mistakes
Random draws go wrong before the first roll:
- Not deciding in advance whether duplicates are allowed — lottery-style draws need unique mode, dice rolls do not.
- Off-by-one on bounds: the range is inclusive, so 1 to 6 includes both endpoints.
- Using these formatted number draws as security keys or tokens. Web Crypto supplies the randomness, but this output format is intended for picks, sampling and demonstrations.
- Re-rolling until you like the result and keeping only that roll, which quietly defeats the point of randomization.
Why use this tool
This is the right tool when:
- A game, draw or demo needs uniform, unbiased picks.
- A classroom or workshop needs visible, instant randomness without installing anything.
- You need a quick random sample of records for spot-checking a list or dataset.
- Dice or coins are unavailable and a bounded draw substitutes cleanly.
Frequently asked questions
Does the Random Number Generator send my data anywhere?
No. It runs entirely in your browser — your input is processed on your device and never uploaded. Refresh the page and it still works offline.