We don't have any official approximate calculators yet, but we are aiming to reach five percentages on annual basis due to the recently deployed Monetary Policy.
Speaking about the current exact rewards, t's hard to calculate certain quantities of rewards for operating a leasing pool or leasing to an already existing one as it all depends on how many blocks will be forged by a fullnode or on some details of an exact leasing pool, such as the number of rewards to be distributed by a leasing pool. We have no approximate calculator as for now, but maybe someone from node operators might be helpful and share their own experience about running a node if you ask on the forum provided in the post above.
Sincerely,
Wave Community Manager