In a thread in the Basses forum, several technical questions came up regarding string tension. In response to this, I have made up a spreadsheet. First let me say, I invite everyone to check my math and derivations. I will then make any corrections to it. EDIT- this following paragraph now refers to the second sheet of the spreadsheet. Second, let me just note that the first column represents a 35" E string, with string length beyond nut and bridge neglected, so that the results are as if the string were clamped hard at these points. The second column uses these extra lengths in the equations, under the assumption that the string is free to slide over these points. The third column is a bit of a hack to simulate plucking the portion of the string on the headstock. Third, thanks to JP for the last sheet, which is his fret calculator with a few revisions. EDIT- this following paragraph now refers to the first sheet of the spreadsheet. The first part of the sheet is for figuring what will be the tension required to bring a given string, at a given scale length, to a given pitch. This should be useful to anyone playing with different scale lengths. EDIT- It also contains sections for figuring any of the four factors, given the other three. EDIT- this following paragraph now refers to the second sheet of the spreadsheet. The second part of the sheet attempts to see how much the pitch should increase due to the plucking deflection. This is something not accounted for by the "ideal" string equation. It also calculates the finger's plucking force. EDIT- this following two paragraphs not entirely accurate, due to corrections that were made in later revisions. The results in the second part are not what I expected. It predicts that if the string is clamped at bridge and nut, the transient "going sharp" of the string due to its initial deflection is only .115 cents; and that if the string is allowed to move over the bridge and nut this is only slightly reduced to .104 cents. The most surprising thing to me is that both of these values are so low. As Sheldon D. pointed out, a string generally goes by several cents when first plucked; so either I my formulas are off, or this is caused by some other mechanism. Another surprising result was that the clamped-string and free-string plucking forces were virtually the same. So, please check it out and comment, correct, etc. Pete EDIT: 2003.11.17.1200: spreadsheet has a problem (see below), will fix and repost. EDIT: 2003.11.18.2310: deleted this attachment; new version posted below. EDIT: 2004.11.02.0745: Added notes to bring up to date.