# How to Find 90th Percentile in Excel: A Step-by-Step Guide

If you’re looking to find the 90th percentile in Excel, the process is straightforward. You can use the built-in PERCENTILE function to quickly and accurately determine this value. Here’s a quick overview: input your data set into Excel, use the PERCENTILE function by specifying your data range and the desired percentile (0.9 for the 90th percentile), and voila, Excel gives you the result. Let’s dive into the step-by-step process to ensure you get it right.

## Step-by-Step Tutorial: How to Find 90th Percentile in Excel

The following steps will guide you through finding the 90th percentile in Excel with ease. By the end of this tutorial, you’ll be able to calculate percentiles for any data set in Excel.

### Step 1: Input Your Data Set

First, you need to enter your data set into an Excel spreadsheet.

Organize your data into a single column or row. This makes it easier to select the range later. For example, you could input numbers like 23, 45, 67, 89, and so on into cells A1 through A10.

### Step 2: Select an Empty Cell

Next, choose an empty cell where you want the 90th percentile result to appear.

This could be any cell outside of your data set, such as B1 if your data is in column A. It’s important to have a designated spot for the result to keep your data organized.

### Step 3: Enter the PERCENTILE Formula

Click on the empty cell and type the formula: =PERCENTILE(array, k).

In this formula, "array" represents your data range, and "k" represents the percentile you want to find. For the 90th percentile, "k" would be 0.9. So, if your data is in cells A1 to A10, your formula would look like this: =PERCENTILE(A1:A10, 0.9).

### Step 4: Press Enter

Press the Enter key on your keyboard.

Once you hit Enter, Excel will calculate and display the 90th percentile of your data set in the cell you selected.

### Step 5: Verify the Result

Double-check the result to ensure it’s correct.

You can cross-verify by manually calculating the percentile or using other statistical tools. This helps ensure your data is accurate and reliable.

After completing these steps, Excel will display the 90th percentile value in the selected cell. This value represents the point at which 90% of your data values fall below.

## Tips for Finding 90th Percentile in Excel

1. Double-Check Your Data Range: Make sure you’ve selected the correct range for your data set.
2. Use Named Ranges: For large data sets, consider using named ranges for easier reference in formulas.
3. Understand Your Data: Know what your data represents to interpret the 90th percentile correctly.
4. Utilize Excel’s Help: If you’re unsure about the PERCENTILE function, use Excel’s built-in help feature for guidance.
5. Experiment with Other Percentiles: Try finding the 50th or 75th percentile to get more insights into your data distribution.

### What is a percentile?

A percentile is a measure that indicates the value below which a given percentage of observations fall.

### Can I use PERCENTILE.INC and PERCENTILE.EXC?

Yes, PERCENTILE.INC includes the 0th and 100th percentiles, while PERCENTILE.EXC excludes them. Use them based on your data requirements.

### What if my data has text or empty cells?

The PERCENTILE function only works with numerical data. Ensure your data set is clean and free of text or empty cells.

### How do I find the 90th percentile if my data is in rows?

Select the row range instead of the column. The function works the same way.

### What if I get an error?

Check your formula syntax and ensure the data range and percentile value are correctly specified.

## Summary

2. Select an empty cell.
3. Enter the PERCENTILE formula.
4. Press Enter.
5. Verify the result.

## Conclusion

Finding the 90th percentile in Excel is a breeze with the PERCENTILE function. By following the steps above, you can quickly identify this critical data point, helping you make informed decisions based on your data set. Percentiles offer valuable insights, whether you’re analyzing test scores, sales figures, or any other numerical data.

Remember, the key to mastering Excel functions is practice. So, don’t hesitate to experiment with different data sets and percentile values. The more you use these functions, the more intuitive they become. For further reading, check out Excel’s advanced statistical functions like QUARTILE and MEDIAN. Now, go ahead and wield your newfound knowledge to uncover hidden patterns and trends in your data!