I would have thought there would be a site that once you select the player and the points you think they could score it would give you the increase and new value of that player.There are projections on SC and in other sites, but if you have nothing else to go off, take the score you think they'll get, subtract their Breakeven (BE) and multiply the result by $450/pt early rounds, $425 thereafter.
There are more exact ways and I can give you the formulas if you like, but it is all guesswork because we have to take a stab at the magic number (MN) for the week, but the actual MN can differ.(because the MN is back-calculated based on the number needed to keep the Total Price Pool (TPP) constant.
The starting MN this year was 5.6k/point or so, that will end up around 5.2k later in the year (MN drops because the rookies easily outstrip their starting price AVG)
That was probably way more than you were looking for., Sorry
I keep seeing people posting things like if he scores X points his value will increase $x amount