Crypto Calc
Calculate your win/loss
It's very simple. When you buy BTC for 500€, put that into the "Your investment" field. Remember the current crypto price and put that to the "old crypto price" field.
In the "new crypto price" field, you enter the number you are waiting for and it will give you your current cash, profit and the percentage. You can also check on how much are owning right now when entering the new crypto price.