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Message: [QUOTE="Robert, post: 3744586"] Is there an easy way to interpolate data points, for example if I have 30 cells. The 1st, 12th and the 30th cell have data points only, can excel populate the empty cells using the giving data points. I can manage this with a single row of data (small range) but when I run into large data collections this is to much to for myself to manage. Any thoughts? What I'm looking for is a more automated method of selecting a horizontal or vertical direction of interpolation using a varying amount of control points (2d only). Thanks [/QUOTE]