Linear interpolation

Interpolation Calculator calculates the unknown interpolated coordinate between the two known coordinates. Normally Linear Interpolation is called as Interpolation.

$$ f(x) = f(x1)+(x-x1) \frac{f(x2)-f(x1)}{x2-x1} $$
x f(x)
x1
x2
x 80

Explain

$$ f(14) = 100 + (14 - 10) \frac { 50 - 100 }{20 - 10} = 80 $$

You can see Bilinear interpolation calculator.