Lagrange Interpolation Calculator

    Interpolate using Lagrange polynomials

    Formula

    P(x) = Σ yᵢ Πⱼ≠ᵢ (x-xⱼ)/(xᵢ-xⱼ)

    Lagrange polynomial passes through all given data points.

    Examples

    (1,1),(2,4),(3,9) at x=2.5

    P(2.5) = 6.25 (matches x²).

    Frequently Asked Questions

    About Lagrange Interpolation

    Interpolate values using Lagrange polynomial.