A stepper motor is a synchronous electric motor that, unlike many other types of motors, rotates only a certain number of degrees at a time rather than rotating continuously. This principle of operation makes it excellent for use in motion control systems. Measuring the torque and power of a stepper motor is an important part of a stepper motor’s development process. Simulation software can be used to estimate the torque and power of a motor at an early stage of design work, but at a certain stage in the development process, it is necessary to measure performance in practice. A dynamometer is a type of device that can measure the torque and power of a motor or an engine. There are dynamometers on the market for measuring the performance of motors in all size and power classes. However, there are no inexpensive dynamometer options for measuring the torque and power of miniature-sized stepper motors. The goal of this thesis is to design a dynamometer for measuring the torque and power of miniature stepper motors. The thesis is divided into two parts. The theoretical section introduces the basic principle of torque measurement, the most common types of dynamometers, and the calculation of power. The practical part introduces the built dynamometer and its operating principle, the torque and power of the three miniature stepper motors is measured at different pulse frequencies, and the torque measurement results are compared with the torque specifications reported by the stepper motor manufacturer. The built dynamometer is sufficient for rough testing of miniature stepper motors based on the measurement results. The measurement results were close to the manufacturer’s stated readings. However, there was variation in the measurement results, the causes of which are analyzed and a few changes to the structure of the dynamometer are proposed to improve the accuracy and repeatability of the measurement results in future measurements.