I was putting number to the TSS formula from the Training and Racing with a Power Meter book. But I get a 1.xx number I seem to be off a factor of 100. Formula TSS=(s * W * IF)/(FTP * 3600) s=duration in seconds W=Normlized power IF=Itensity factor 3600 seconds = 1 hour The numbers I used were one hour at 221(this atheletes FTP) at a TT IF of 1.0. I was expecting 100, but notice that number would cancel out to 1.00 (3600*221*1.00)/(221*3600) = 1.00 I tried to find an expaination in the TSS section of the book. I briefly had time and did not find anything. Is the Factor of 100 just suposed to be understood or am I missing something? Jeff

Yes, you are missing the 100 multiplier. The algorithm is described here on page 11 http://www.peakscoachinggroup.com/PowerTrainingChapter.pdf.

IIRC, Andy has previously acknowledged this as an error in the book to be corrected in any future edition. In summary: TSS = IF x #hrs x 100

I tried searcing the forum for TSS, but the search engine did not like the string and said: "Sorry - no matches. Please try some different terms. The following words are either very common, too long, or too short and were not included in your search : TSS" So I thought I would ask Thanks again. Not in the book either. The link Rapdaddyo suplied dose not mention Squaring the IF either? High Barry.