How to highlight cells if value greater or less than a number in Excel?
Let’s say you have a table with large amounts of data, to find the cells with values that are greater or less than a specific value, it will be tiresome and time-consuming. In this tutorial, I will talk about the ways to quickly highlight the cells that contain values greater or less than a specified number in Excel.
Highlight cells if value greater or less than a number with Conditional Formatting
1. Select the data range where you want to highlight the cells that contain values greater or less than a specified value. 
2. On the Home tab, click Conditional Formatting > Highlight Cells Rules, and then select Greater Than, Less Than or other options as you need.
3. (Here I selected Greater Than as an example.) In the pop-up Greater Than dialog box, enter the value in the input box at left, and select the format option in the drop-down list at right as shown below.
Note: If you want to use a custom format, choose Custom Format, and then customize your format in the pop-up Format Cells dialog box.
4. The cells that meet the condition you set are highlighted at once.
Note: If you need to edit the rule, such as to change the value (450), the relationship (greater than to less than for example), or the range where to apply the rule, click Conditional Formatting > Manage Rules to bring up the Conditional Formatting Rules Manager.
Highlight cells if value greater or less than a number with Select Specific Cells feature
Kutools for Excel offers the Select Specific Cells feature to help you find multiple values that meet one or two conditions you set at once, please read on to find out how to quickly highlight cells that contain values greater or less than a number.
1. On the Kutools tab, in the Editing group, click Select > Select Specific Cells.
- In the Select cells in this range box, click the range-selecting button
at right to specify the range from where to highlight the cells. Note: To search across the whole sheet, click on the sheet tab. - In the Selection type section, select the Cell option.
- In the Specific type section, set one or two conditions:
- Click on the drop-down arrow at left side to select a relationship you need, such as Greater than, Less than, Greater than or equal to, etc.
- Type the value in the corresponding box according to your needs.
- Specify the relationship between the two conditions (if there are): And or Or.
at right to specify the range from where to highlight the cells. 
3. Click Ok to select the cells that meet the condition(s) you set. A dialog box pops up telling you how many cells were found and selected.
4. Click OK. Now, you can highlight the selected cells at once by giving them a different font color, fill color or other formats.
Note: To use the Select Specific Cells feature, you should have Kutools for Excel installed in your computer. If you do not have Kutools installed, click here to download and install. The professional Excel add-in offers a 30-day free trial with no limitations.
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