Hello,

i don't mind paying the fee, but I want to know how big it will be. I know it is determined in mBTC/kB but how many kB will a transaction be? How can I determine it? And what happens if I withdraw all my BTC from my wallet? I cannot have a negative balance, so will my payment order be diminished? Does it always happen this way?

And most importantly - if I want to make a payment of a precise amount, will it be affected? How do I ensure that the desired amount is being transferred from my wallet if I don't know the fees?

Thanks in advance.