Article ID: 181918 - View products that this article applies to.
This article was previously published under Q181918
For a Microsoft Excel for Windows version of this article, see 323625
Microsoft Excel for Mac calculates a number based on its stored value not its displayed value. When a formula or worksheet function performs a calculation, Excel for Mac uses the values in cells that are referenced by the formula. Note that the displayed value may be different because of number formatting.
When you format numbers by clicking Cells on the Format menu, you alter the way Excel for Mac displays the numbers; however, when you calculate numbers, Excel for Mac performs the calculations by using the stored values. When you calculate formatted values, you may receive unexpected results because the displayed numbers may be slightly different from the stored values.
For example, if two cells each contain the value 10.005, and the cells are formatted to display values as currency, the value $10.01 is displayed in each cell. If you add the two cells together, the result is $20.01 because Excel for Mac adds the stored values (10.005 + 10.005), not the displayed values ($10.01 + $10.01).
If you want the calculations to be based on the displayed values, you can change the precision of calculations so that they use the displayed values instead of the stored values. To do this, use the Precision As Displayed feature or make sure that the values are rounded to the same precision as the number formatting.
Round Values to the Same Precision as Number FormattingYou can use the ROUND worksheet function to round values to a specific precision.
For this example, type the following in a new worksheet:
The resulting values in the cells appear to be:
$A$1: $10.005 $A$2: $10.005 $A$3: =SUM(A1:A2)
This gives the appearance of an error in calculation, as stated earlier. To round the precision to reflect the apparent resulting value in A3, replace the entries with the following:
$A$1: $10.01 $A$2: $10.01 $A$3: $20.01
If you now use the currency format, the following values are displayed:
$A$1: =ROUND(10.005,2) $A$2: =ROUND(10.005,2) $A$3: =SUM(A1:A2)
When you do this, the worksheet function takes the result of the expression in the first argument and rounds it to the hundredth's place (two digits to the right of the decimal).
$A$1: $10.01 $A$2: $10.01 $A$3: $20.02
Round All Values in a Worksheet by Using Precision As DisplayedIf you want the calculations to be based on the displayed values, change the precision of calculations so that they use the displayed values instead of the stored values. To do this, follow these steps:
For more information about calculation precision, click Microsoft Excel for Mac Help on the Help menu, type precision calculation in the Office Assistant or the Answer Wizard, and then click Search to view the topics returned.
Article ID: 181918 - Last Review: January 22, 2007 - Revision: 3.2