Use this interpolator to estimate values between ordered samples when the chosen curve model is defensible over the local interval.

X0

First point x coordinate.

Y0

First point y coordinate.

X1

Second point x coordinate.

Y1

Second point y coordinate.

X

Query x coordinate.

Interpolate between two points along an exponential curve of constant ratio. The tool evaluates the supplied inputs together and returns the named outputs below; it does not infer omitted operating conditions or change the units shown.^[1]

Y

Interpolated y value on the exponential curve.

• Interpolation does not validate the samples or justify extrapolation. Sorting, duplicate coordinates, spacing, endpoint derivatives, monotonicity, overshoot, noise, and domain physics determine whether the estimate is meaningful.
• Use finite inputs in the displayed units and preserve more precision than the final presentation requires. Independently verify safety-critical, financial, compliance, or production decisions.

Plot the data and interpolant, compare methods, test known points exactly, and avoid extrapolating beyond the measured range without a model.

• Cubic Hermite Interpolation Calculator

  Interpolate between two values with specified tangents using cubic Hermite basis functions.

• Linear Interpolation Calculator

  Interpolate between two values using a finite parameter.

• Inverse Linear Interpolation Calculator

  Find the interpolation parameter corresponding to a value between two endpoints.