ADD-IN for MS EXCEL http://www.xlxtrfun.com/XlXtrFun/XlXtrFun.htm
following summary via xlxtrfun website:
"XlXtrFun.xll is a collection of functions which extends the capabilities of Microsoft Excel; developed primarily to facilitate, interpolation of 2-dimensional and 3-dimensional data, and simplify 2-variable curve fitting. XlXtrFun has been used for years by engineering and research and development personnel on every continent who need to interpolate, extrapolate, and curve fit data rapidly, reliably, and with a virtually non-existent learning curve.
If you work with real-life data and want to interpolate, extrapolate, or curve fit, then you will find these functions very useful."
There's no way to download this function. Can you please post it somewhere else, or send me a link/file.
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Details here.........
excel interpolation function