Wifi booster boosts range to how many meters

Solution
There are far too many local variables from one situation to another to give you any meaningful distance values for range extenders.

It's a case of "buy and try" basically, just as I did.

I wasn't disappointed, but that doesn't necessarily hold good for everyone (even if they use the same model as me).
Impossible to predict since it depends on what the building is made of. The number you see is 100 meters.

The problem you have is not how far the signal will go it is how far it will go and still be usable. The problem now days is not so much the signal strength but all the interference from other wifi devices. You in effect have too much signal from too many device and it gets unusable at very short distances.
 
There are far too many local variables from one situation to another to give you any meaningful distance values for range extenders.

It's a case of "buy and try" basically, just as I did.

I wasn't disappointed, but that doesn't necessarily hold good for everyone (even if they use the same model as me).
 
Solution
not to mention in all of this calculus were doing that every single Wi-Fi booster can boost differently (directional models will go father than omnidirectional) and the power of the antenna will also boost father, a single plug into wall you get about 25-50ft (10-22m) while a proper outside antenna model with 25db gain can reach 33m-100ft easily in a straight line ( discounting building interferences) all depends what you are trying to achieve here.