Hello guys.
How to calculate how much bytes a uint8 or uint16 or any other data type going to take in the evm slot?

In general, you can cheat and check for example here: https://docs.oracle.com/cd/E19253-01/817-6223/chp-typeopexpr-2/index.html
But if you get them packed they will take less space but that depends on the implementaion