The best measure of how many people are playing Black Ops 7 right now is Steam DB which logs player counts and peaks for all Steam games. That currently has a 74,782 24-hour peak. That's quite a drop from the 491,670 all-time peak from 3 years ago, when Modern Warfare 2 was released.
In fact the current player count marks a continued general drop off since April 2025 when it hit a 138,335 player peak. Since then the player count has declined month on month, bar a brief 99,072 player peak last month.
Generally, the game sees a peak when a new installment launches, like Black Ops 6's 313,313 player peak last year but, since July 2025, it's struggled to break 100K. The overall weirdness of the game, as noted on our Black Ops 7 review definitely seems to he had an impact this year's launch. Although looking at the data all the way back to 2022 the erage has been 178, 267 players at a peak, between then and roughly the beginning of this year when the sharper decline started.
Obviously this only tells us about PC players but we know very roughly that PC has a 21% share of the gaming market, and console takes about 24% (with the remaining 50% going to mobile gaming). So, with that almost a one to one ratio, that would make the 24-hour peak player count on all platforms for Black Ops 7 approx 160,000, as a broad guesstimate. Obviously that doesn't include things like Battlenet players or service like GeForce NOW where BO7 is also playable but this is only the roughest of rough guesses.