Interpolation Calculator

Calculate missing data points using linear or polynomial interpolation methods. Enter your known data points below and get instant results.

Interpolation Method

Linear Interpolation Polynomial Interpolation

Enter your known (x, y) coordinate pairs:

X value to interpolate:

Enter data points and click Calculate to see results

Connects data points with straight lines. Best for simple datasets where you expect a linear relationship between points.

y = y_{1} + \frac{y_{2} - y_{1}}{x_{2} - x_{1}} (x - x_{1})

Uses Newton's divided differences to create a polynomial that passes through all data points. Better for curved relationships.

P (x) = f_{0} + \sum_{i = 1}^{n} f_{0, 1, ..., i} \prod_{j = 0}^{i - 1} (x - x_{j})