In accordance with the requirements of GOST ISO / IEC 17025-2019 General requirements for the competence of testing and calibration laboratories, a laboratory performing calibration, including its own equipment, must assess the measurement uncertainty for all calibrations. The article describes an algorithm for estimating measurement uncertainty in the calibration of laboratory metering devices. In particular, we consider the measurement uncertainty budget for calibration of a Proline Mechanical Pipette BIOHIT Sartorius pipette dispenser with a variable dosing volume.