Free math calculators designed for mathematicians. This Linear Interpolation Calculator:
The interpolation calculator allows you to calculate the value of a point along a line if you know two other points on that line. Enter the first data point (First X, First Y) and the second data point (Second X, Second Y) to establish the general direction of the line. Then, enter the X value of the third point. Hit calculate - the linear interpolation calculator will generate the interpolated value (the unknown point) and plot the unknown value on the graph, along with the known coordinates.
This interpolation calculator applies the linear interpolation formula to derive the dependent (y) value of the third point. This presumes the three points are in a straight line and that there is no natural variation or error in measurement. The Linear interpolation function works fairly well for simple models. It's a basic forecast function but works relatively well if the given coordinates (with the known value of y) are from a similar set of data. The new data point will be lined up with the existing trend.
For easy entry, you can copy and paste your data into the entry box from Excel. You can save your data for use with the interpolation calculator and other calculators on this site. Just hit the "save data" button. It will save the data in your browser (not on our server, it remains private). Saved data sets will appear on the list of saved datasets below the data entry panel. To retrieve it, click the "load data" button next to it.
Need to pass an answer to a friend? It's easy to link and share the results of the Linear Interpolation Calculator. Hit calculate - then simply cut and paste the url after hitting calculate - it will retain the values you enter so you can share them via email or social media.