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

Start value

Required number input.

End value

Required number input.

Parameter

Required number input.

Interpolate between two values using a finite parameter. 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]

Interpolated value

The resulting interpolated value returned as a number.

• 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.

• Inverse Linear Interpolation Calculator

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

• Exponential Interpolation Calculator

  Interpolate between two points along an exponential curve of constant ratio.