The paper suggests algorithms enabling self-calibration of measurement channels with linear as well as nonlinear conversion functions. To approximate conversion characteristics, interpolation methods are used. They are widely known; however, the essence of the suggested self-calibration method is the current modernization of interpolating functions parameters due to a suitable procedure. It enables correction of the two essential error components which may appear in the measurement channel by means of evaluating the current value of the real slope of the conversion characteristic as well as of the components describing nonlinearity generated by disturbing factors. The methods of self-calibration for measurement channels cooperating with non-electrical quantities sensors are compared. Interpolation of conversion functions is assumed as linear in intervals and polynomial.