Who this helps
- Organizers assigning numbered turns
- Developers preparing small integer samples
Random Utility
Random Number Generator
Generate random numbers within a custom range. Supports duplicate prevention, excluded numbers, multiple draws, and draw history.
Custom ranges
Enter minimum and maximum values or use quick presets.
Draw rules
Prevent duplicates or exclude specific numbers and ranges.
Result history
Review results, sums, averages, maximums, and minimums by round.
STEP 1
Waiting
Random number settings
Choose a range, draw count, and exclusion rules, then generate random numbers.
Draw result
No draw yet
-
Latest sum
0
Latest average
0
Recorded rounds
0
HISTORY
Draw history
Each round stores results, sums, and averages.
History count
0
Maximum
0
Minimum
0
- No draw history yet.
Set the range and repeat rules before drawing numbers
Draw integers from an inclusive range, exclude individual numbers or ranges, and choose whether results can repeat. Review available candidates and past draws before sharing a result.
When to use this tool
- Pick six different numbers from 1–45.
- Exclude previously assigned numbers from a new draw.
From input to a checked result
- 1
Set the minimum and maximum integers.
- 2
Choose the draw count and whether to exclude duplicates.
- 3
Enter exclusions using commas and ranges such as 2,3~4.
- 4
Check that enough candidates remain.
- 5
Draw and record the range, exclusions and duplicate rule with the result.
Two candidates, five draws
- Input
- 1–5; exclude 2,3~4; count 5; duplicates allowed
- Result
- Five values, each either 1 or 5.
Repeated values are allowed, so the count can exceed the candidate pool.
An exhausted pool
- Input
- 1–5; exclude 2,3~4; count 2; no duplicates
- Result
- 1 and 5 appear once each, in an unpredictable order.
The next draw has no candidates until history is cleared or the rules change.
How it works
The tool combines overlapping exclusion ranges, builds a candidate array and selects indexes using Math.random(). With duplicate exclusion enabled, selected numbers leave the pool and stay excluded across draws in this page session.
Limitations
- Math.random() is not a cryptographic random source or an auditable draw system.
- Endpoints must be integers within ±1 billion; the range allows at most 100,000 integers, a draw 1,000 results and exclusions 10,000 characters.
- Disabling history does not clear the set of numbers drawn with duplicate exclusion.
- Clearing history, resetting or reloading also clears the used-number set.
Your data
Inputs and results are processed in the browser and are not uploaded by the tool.
References
Related tools
- Roulette Picker
Enter options and spin an online roulette wheel to pick one at random. Useful for menus, giveaways, tasks, turns, and quick decisions.
- Team Splitter
Enter a member list, choose the number of teams, and create random teams online. Use gender balance, seed distribution, and automatic leader assignment for fairer groups.
Frequently asked questions
Do earlier results stay excluded?
Numbers drawn while duplicate exclusion is on remain excluded. Numbers drawn with it off are not added to that set.
Can I repeat more times than the pool size?
Yes, if duplicates are allowed and at least one candidate remains.
Why does clearing history change the next draw?
It also clears previously used numbers, making them eligible again.