we should have the staking calculator up in the next few days, but for now, you can manually calculate staking from https://chainz.cryptoid.info/mue/#!extraction
its currently about 50% ROI vs 35% ROI for MasterNodes
currently 26.5 million coins being staked
so do (yournumberofcoins/26.5 million x 100) for your % of staking rewards
The staking rewards are circa 36,000 MUE per day
Then multiply the number of coins you'd get by staking by 365 to give you Y
Y divided by yournumberofcoins x 100 for your ROI %
e.g for a MasterNode operator
500,000/26,500,000 x 100 = 1.89% of daily staking rewards
1.89% of 36,000 = 680 mue
680 x 365 for yearly staking rewards = 248,200
Yearly ROI is 248,000/500,000 x 100 = 49.6%
this is just an example, and will change