Entering Numbers in Excel

When you enter information into a cell in your worksheet, you may wonder exactly how Excel translates what you enter. Excel first tries to convert information into numbers. Numbers are just that—any of the digits (0 through 9), optionally with special characters. The most common of these special characters are the period (taken to be a decimal point), a comma between numbers, a minus sign or plus sign, and a percent sign after the number. If you use the percent sign, Excel assumes you are entering a percentage, and thereby divides the number by 100 for internal storage.

Other special characters can be used, as well. For instance, if you preface your number with a dollar sign, Excel assumes you are entering a currency amount. You can also enter numbers surrounded by parentheses—such as (123)—which is another way of indicating a negative number. The slash character (/) can be used to indicate either a fraction or a date. Finally, you can use the letter E (upper- or lowercase) to indicate that you are entering a number in scientific notation. All of these different numbers and symbols are summarized in the following table:

Remember that when you use symbols in your numbers, they must make sense. For instance, you cannot input two decimal points or two percent signs and expect Excel to understand what you are doing. If you try entering such a nonsensical number, chances are Excel will assume you are entering text.