Linear Interpolation Calculator
Estimate an unknown value between two data points with linear interpolation.
Result
How to use
- Enter your values in the fields above.
- Press Calculate to see your result instantly.
- Use the Share button to copy a link to your result.
About this calculator
This calculator estimates an unknown y value on the straight line connecting two known points using linear interpolation: y = y1 + (x − x1)·(y2 − y1)/(x2 − x1). It assumes the relationship between x and y is linear between the two given points.
Engineers, scientists, and spreadsheet users rely on it to fill gaps in lookup tables, calibration curves, and sensor readings — for example, finding a property value at a temperature that falls between two tabulated points. Enter the two known points and the x value to interpolate to get the estimated y.
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