If you need to perform logarithmic functions in a Microsoft Excel 2003 spreadsheet, the following may be useful:

**=ln(NUMBER)**

Returns the natural log of NUMBER.

**=log(NUMBER,BASE)**

Returns the log of NUMBER to the designated BASE.

**=log10(NUMBER)**

Returns the base-10 log of NUMBER.

Assume the following spreadsheet:

**A1**: =ln(3.787)

**A2**: =log(900,30)

**A3**: =log10100)

This will return the values:

**A1**: 1.999722 (approximated)

**A2**: 2

**A3**: 2

*Press the "print" button on your browser or select "File" - "Print" to print this tip. Then, return to Microsoft Excel 2003 Functions and Formulas - Logarithmic Functions.*

Standard disclaimer applies - Read http://tipsforspreadsheets.com/copyright-disclaim.html.