Rich -

I am trying to calculate values for a curve using the LOGEST fx, but the
numbers are not agreeing with the formula provided by the logarithmic
curve formulas in a chart of the data (nor by the 'eyeball' method). Any
thoughts? <

Two thoughts:

(1) LOGEST is appropriate for an exponential trendline, not for the
logarithmic trendline.

(2) Be sure you're using an XY (Scatter) chart type, not a Line chart type.

- Mike
www.mikemiddleton.com