What is the max amount of coins?
Also is there a mining calculator?
There is no max amount of coins; from the original ANN posting (
https://bitcointalk.org/index.php?topic=1121974.0):
Reward: Every 7 days the reward decays by a compounding 1%. Decay continues until we reach 2 UIS (approximately in June 2022, on block 3,933,199) and then this remains static for each block thereafter. Mined blocks mature after 180 confimations.
So, after block 3,933,199 the reward will be 2 UIS forever thereafter; with a 60 second target block time, there is a new block (on average) every minute. It works out to 1'051,200 UIS per year.