Missing Number Finder
Paste the numbers you have; the tool compares them against the range (step by step) and lists the ones that never appear. Duplicates are removed automatically.
Range Source:
Min:
Max:
Step:
Output:
Separator:
Statistics Result
Download CSV
| No. | Missing Value / Range | Quantity |
|---|
Introduction to the tool and how to use it
Missing Number Finder quickly answers which numbers are missing from this run of values. Typical uses: reconciling ticket numbers, checking whether IDs are consecutive, hunting gaps in raffle numbers, auditing stock codes, or verifying exam question numbers.
Note: only integers are recognized; decimals and text are ignored. With a custom range, numbers outside it are not counted toward the missing check and are noted separately in the stats. When the range exceeds 200,000, it is truncated automatically with a notice.
Note: only integers are recognized; decimals and text are ignored. With a custom range, numbers outside it are not counted toward the missing check and are noted separately in the stats. When the range exceeds 200,000, it is truncated automatically with a notice.
How to use
- Paste the existing numbers into the input box; commas, spaces, line breaks, or any symbol are fine, and duplicates are removed automatically.
- Choose the range source:
· Auto from min/max — sets the check range from the smallest and largest numbers you entered (most common);
· Custom range — enter the minimum and maximum yourself, suited to questions like which values from 1 to 100 are missing. - Set the step — the default 1 checks every number; enter 2 to check an arithmetic progression like 1, 3, 5, 7... (good for IDs where only parity or a fixed interval matters).
- Choose the output:
· Missing numbers — each gap value on its own line, ready to copy directly;
· Missing ranges — consecutive gaps merge into a range such as 12 - 18, so you can see how long the gap is at a glance. - Set the separator — the default \\n means one per line; switch to a half-width comma to join everything onto one line.
- Click start; results appear in the text box and the table below (index / missing numbers or ranges / missing count), and the table can be downloaded as CSV.
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