There is already a stats page made by a community member where u can check the profits later. My experience in the last 8 years are that i can only calculate my profit when i do mining. Not any calculator is correct (all about ur speed in compare with ur powercosts and the every seconds changing difficulty from all coins, also in this calculate u must have a future price (nobody knows a future price) and the price from now), so i just check my profits during mining..
What page? Rewards calculation is purely mathematical and has nothing to do with the price or future.
Ah u mean: press ur h/s and see how many u get a day?
Depends on the diff, many times a site told me i would get like 10k coins in 24 hours, at the end it was 15k or 1k or 4k.. Depends if the diff is getting higher or lower.
But for me the ''old'' calculator works, dont know how it's now