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 answers "what is absent from this list?" in one click — useful for checking receipt or invoice numbers, verifying that an ID sequence has no holes, spotting skipped lottery numbers, auditing stock codes or validating exam question numbers.
Steps:
1. Paste the numbers you have; commas, spaces, newlines or any separator work, and duplicates are removed automatically;
2. Choose the Range Source:
· Auto from min/max — the smallest and largest numbers you entered define the range (most common);
· Custom range — type a minimum and maximum yourself, e.g. "what is missing between 1 and 100";
3. Set the Step — 1 compares every value; 2 compares an arithmetic sequence such as 1, 3, 5, 7 … (handy for odd/even or fixed-interval codes);
4. Choose what to output:
· Missing values — one missing value per line, ready to copy;
· Missing ranges — consecutive gaps merged into ranges like "12 - 18" so the size of each hole is obvious;
5. Set the separator — the default \n is one value per line; a comma joins them onto one line;
6. Click Run. Results appear in the text box and in the table below (index / missing value or range / count), with CSV export.
Note: only integers are recognised — decimals and text are ignored. In custom range mode, values outside the range are not treated as missing and are reported separately in the summary. Ranges longer than 200000 are truncated with a hint.
Steps:
1. Paste the numbers you have; commas, spaces, newlines or any separator work, and duplicates are removed automatically;
2. Choose the Range Source:
· Auto from min/max — the smallest and largest numbers you entered define the range (most common);
· Custom range — type a minimum and maximum yourself, e.g. "what is missing between 1 and 100";
3. Set the Step — 1 compares every value; 2 compares an arithmetic sequence such as 1, 3, 5, 7 … (handy for odd/even or fixed-interval codes);
4. Choose what to output:
· Missing values — one missing value per line, ready to copy;
· Missing ranges — consecutive gaps merged into ranges like "12 - 18" so the size of each hole is obvious;
5. Set the separator — the default \n is one value per line; a comma joins them onto one line;
6. Click Run. Results appear in the text box and in the table below (index / missing value or range / count), with CSV export.
Note: only integers are recognised — decimals and text are ignored. In custom range mode, values outside the range are not treated as missing and are reported separately in the summary. Ranges longer than 200000 are truncated with a hint.
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