Between 1 and 4 square centimeters.
The number of centimeters of 28nm chip should be described according to different chips, such as mobile chips are relatively small because of space constraints, 28nm process can do 100 square millimeters, that is, 1 square centimeter. And like the computer chip is relatively large, there is no limit to the space of the chip, like Nvidia's GTX graphics card 28nm chip area is 400 square millimeters, that is, 4 square centimeters.
A 28-nanometer chip is about 400 square millimeters.
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A typical 14-nanometer cpu chip is about 160 square millimeters when unpackaged, which is about the size of a fingernail. The 28-nanometer chip is currently not suitable for mainstream computers, mainly used in vehicles, ships, aircraft and other electronic devices with low space requirements, and 400 square millimeters is about a little more than six centimeters long.