The rate at which MOS transistor counts have increased generally follows Moore's law, which observed that the transistor count doubles approximately every two years. However, being directly proportional to the area of a chip, transistor count does not represent how advanced the corresponding manufacturing technology is: a better indication of this is the transistor density (the ratio of a chip's transistor count to its area).
The growth in MOS transistor numbers generally follows Moore's law, which states that the number of transistors doubles every two years. However, being directly related to the size of an integrated circuit, transistor count does not accurately reflect the level of technological advancement: a more precise indicator is provided by considering the ratio of a chip's transistor count to its area.