I figure you mean sMerit, not merits really, but just in case, as @LoyceV indicated, the sum of the most recent provided dataset by @piggy add’s up to:
nUsers 2.481.270 -> Number of Merits (non-sendable) 9.209.690.

Now those are Merits (non-sendable). Sendable Merits have roughly the following context:

* Total sent sMerits: 285.312 as of last Friday (in 136.054 TXs to 25.328 people from 19.013 forum members).
* Current total sMerits sent per week (by Merit Sources and others) : In the 3.500 – 3.800 area /week.
* There are roughly 38k sMerits in the hands of forum members that have not been originated in the initial sMerit Airdrop (see re: [TOP-200] Members who have a lot of earned sMerits).
* If we include the airdropped sMerit, the sum rises to around 450k (see re: [TOP-200] Members who have a lot of earned sMerits).
* Merit Sources are capable of distributing up to 22.055 sMerits per 30 days (aside from that, users may too as indicates above).

Bare in mind that many of airdropped still available sMerits may not really be in game, as they may be in the hands of accounts that do not care for merit, are not active, have been banned, etc.