When calculating solo mining chances over a longer period of time, e.g. for more than one year, it would be increasingly
inaccurate, and at some point just straight up false, to assume the network hashrate is not changing. Because it is!
This calculator aims to factor in a (more or less) realistic estimated growth of the network hashrate. By how much it is going to increase in the future is, of course, pure speculation, which is why you can adjust the yearly growth factor yourself, as you see fit. For example, if you think the network hashrate is going to double every year, you would set a value of 2.
If you have no idea where to start, however, we do propose a default value of 1.41, which corresponds to the hashrate doubling every 2 years. This roughly matches the past few years of hashrate data and can also be justified with Moore's Law.
Of course, if you prefer to use a contant hashrate for your calculations, you can disable this feature entirely.
Good luck and happy hashing!