Interpolation Calculator

Find unknown values between two known data points using linear interpolation.

Linear Interpolation

Enter the known data points and the value you want to interpolate.

First X value (x₁)

First Y value (y₁)

Second X value (x₂)

Second Y value (y₂)

Select what you want to find:

Find Y for a given X Find X for a given Y

X value to find Y for

Linear interpolation is used to estimate unknown values between two known data points. The formula for linear interpolation is:

y = y₁ + (x - x₁) × (y₂ - y₁) / (x₂ - x₁)

Enter the two known points (x₁, y₁) and (x₂, y₂), then select whether you want to find a Y value for a given X, or an X value for a given Y.