Number of significant digits MS Excel retains

Microsoft Excel retains 15 significant digits. To display all 15 digits, you must use a number format (custom or built-in) other than General. The General number format displays up to 11 numeric characters, with the decimal point counting as a numeric character. Therefore, if the number contains a decimal point, Excel can display up to 10 significant digits, but if the number does not contain a decimal point, Excel can display up to 11 significant digits Adding more numbers to the left of the decimal point causes the number to appear in exponential notation.