[McMelchior]

Yeah, that's how to calculate a pot-size re-raise. You call the last bet/raise, and then you raise the (new) size of the pot.

If you play pot limit you'll know that that is the maximum allowed raise, and that gives the last bettor/raisor ahead of you exactly 2:1 pot odds.

But when applying this formula there are a host of other parameters to factor in.

Stack size.

Perceived strengh of your hand relative to perceived strengh of other already or potentially involved players hands.

Do you want a call, a fold or do you want to induce yet a re-raise?

Visual psychology: Online (at Stars at least) a raise is represented by one stack of chips for the call and one for the (additional) raise. If you make your raise a whole number of some denomination of chips (like in your t1,350 pot example by raising to t2,900 instead of t3,150) you create a much more intimidating visual presentation of your raise than if you put out a mixed stack of chips with a few t25 chips on top.

Raising the right amount is an art, that can't be pinned down to one single formula.