Examples of techniques for determining a reading speed based on user behavior are disclosed. In one example implementation according to aspects of the present disclosure, a computer-implemented method may include monitoring, by a processing device, data continuously, wherein the data is generated by a sensor of the user device; determining, by the processing device, an orientation and a wobble of the user device based on the data generated by the sensor; determining, by the processing device, a reading speed of a user using the user device based on the orientation and the wobble; detecting, by the processing device, a change in at least one of the orientation and the wobble of the user device based on the data; and adjusting, by the processing device, the reading speed of the user using the user device based on the change in the at least one of the orientation and the wobble.