Perfect ! What price do you use for profitability calculations ?
The average of the last transaction price on exchanges ?
Or the bid price ?
We should choose between last price and bid price (the real price when i sell the mined coins), and choose the exchange for profitability calculations

Thanks

For profitability calculations we use difficulty, block time, block reward, price in BTC ...
Where are you getting these metrics from? In your calculator, the current block reward for Bitcoin Gold is clearly wrong (which is why it's showing as #1 atm), and I've noticed similar problems in the past with other coins. I have a really tough time trusting this calculator.