Try using regression from data analysis.
> how to get slope with a forced intercept of zero in excel
See Help for the LINEST worksheet function.
Jerry
> how to get slope with a forced intercept of zero in excel
And yet a third way is
=SUMPRODUCT(y-range, x-range)/SUMSQ(x-range)
or the equivalent
=SUMPRODUCT(y-range, x-range)/SUMPRODUCT(x-range, x-range)
best wishes

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Bernard V Liengme
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> how to get slope with a forced intercept of zero in excel