VISA Inc is capitalised at US $B 246.1
So the current bitcoin capitalisation, based on the algorithm estimate of mined bitcoins, at yesterday's prices amounts to a bit more that VISA Inc.'s capitalisation.
[...and growing]
Prices are off a bit today.
Bitcoin is also just less than a tenth of all USA M1. (Notes & coins in circulation)
[MI - please check my horrific arithmetic ...

(I'm a shocker)]