The percentage is based on the time period represented by one pixel width. If your lower graph is showing only 10 minutes, then each pixel is likely only representing one sample. In that case, is that one sample was a timeout, the red scale will be at 100% (just for that one sample). If, however, your graph scale is 24 hours, then each pixel could represent 15 or 20 samples (this is very dependant on your trace interval, however). In that case, 1 lost sample in that period would only represent 5% packet loss (if there are 20 samples in the period).<br><br>If your lower graph time scale is small, then a lost packet will likely represent 100% packet loss for that sample. As Ping Plotter has to average multiple packets into a single pixel width, though, there is a possiblity to have something besides 0 or 100% packet loss in a period. Here's an example of this where the % really shows a lot of information:<br><br><br><br><br> <br><br>