Find Missing Numbers
Enter existing integers and an inclusive minimum and maximum to list the missing values.
Enter integers separated by commas, semicolons, spaces, or new lines. The inclusive range may contain at most 100,000 integers; up to 10,000 missing results are shown.
A QUICK WALKTHROUGH
How to use this tool
- Enter up to 5,000 signed integers.
- Set an inclusive range of at most 100,000 integers.
- Find up to 10,000 missing values locally in your browser.
Strict integer parsing
Only signed base-10 integer tokens separated by commas, semicolons, spaces, or line breaks are accepted.
Bounded work
The range is limited to 100,000 integers and output to 10,000 values to prevent excessive browser work.
Local processing
Existing values are deduplicated for membership checks, and all processing stays in your browser.
GOOD TO KNOW
Common questions
Are the range endpoints included?
Yes. Both the minimum and maximum are checked.
Are duplicate existing values counted twice?
No. A value is either present or missing.
What happens when too many values are missing?
The tool asks you to narrow the range or provide more existing values.