This tool looks very dubious, unfortunately, no one can determine the price of your altcoins yet. Perhaps someday more interesting platforms will appear with technical analysis or artificial intelligence algorithms for forecasting. Investors should approach such tools with caution and skepticism.
This is not really a serious platform trying to give accurate predictions to anyone that reads this website, the aim of the website seems to simply allow people to see how high the value of their favorite coin will become if it had the price of another coin, and while a novelty, as I do not remember another website that did this specifically, this can be done by yourself with a calculator and it only takes two calculations to do so, so I do not see it as such a time saver to be honest.
yeah the calculation pretty simple and I wonder if this site is even needed for that calculation, what should be affecting prediction is the news surrounding certain coin, and also some events that might come as well as the influence of bitcoin towards the coin.
if its just showing the price based on increased market capitalization I don't think its anything meaningful honestly, will altcoin market capitalization be as high as bitcoin?, will some meme coin with no fundamental whatsoever be having market capitalization as high as etheruem? i doubt that so having this comparation is kind of pointless I would instead be more focused on the rumors and news.