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In this article
TRIMMEAN drops a share of the highest and lowest values and averages the rest, much like judges scoring gymnastics. One giant order stops distorting your “typical” order value.
Syntax
=TRIMMEAN(array, percent)| Argument | What it means |
|---|---|
percent |
Total share to exclude, split between top and bottom. 0.2 drops 10% at each end. |
Examples
Example 1
=TRIMMEAN(E2:E500, 0.1)Average order value without the top and bottom 5%.
💡 Excel rounds the number of excluded points down to an even number, so on small ranges 0.1 may drop nothing at all.
TRIMMEAN in practice
Where you will use it
- Average excluding extreme values
- Judges' scores
- Robust KPIs
Worked example
| Percent | Formula | Result |
|---|---|---|
| 0 | =ROUND(TRIMMEAN({120,135,128,160,95,140,132},A2),2) | 130 |
| 0.3 | =ROUND(TRIMMEAN({120,135,128,160,95,140,132},A3),2) | 131 |
| 0.6 | =ROUND(TRIMMEAN({120,135,128,160,95,140,132},A4),2) | 131.67 |
Results calculated in Excel.
Mistakes people make
| Mistake | What to do instead |
|---|---|
| Percent meaning | 0.3 drops 30% of points in total, split top and bottom |
| Rounding | Excludes points in pairs |
Related functions
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📎 Practice files for this article
- 📗Practice workbook: Statistics advanced33 tasks on realistic sales data — type your formula, the Check column turns green when it is right. Answers sheet included.⬇ XLSX · 36 KB
Free to use for learning. Files with macros (.bas) are plain text — import them with Alt+F11 → File → Import File, and always test on a copy.
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