If you wish to count the same or duplicate values in a column only once in Excel or the count of occurances of duplicate values, read this article.

Thankfully, Microsoft Excel's COUNTIF formula swoops in to save the day. It lets you count cells based on specific text or conditions, turning your spreadsheet chaos into organized data magic.

Duplicates in the same column are easy to find by sorting, filtering, and using conditional formatting. When none of those are an option, try this simple formula solution.

Duplicate entries may be valid -- but when they aren't, they can derail your summaries and totals. Use Excel's Validation feature to reject duplicate entries.