Level boost chart?

Is there a chart somewhere that shows what levels boost to? Specifically, I’m looking for what levels to take a 4* to so that they will boost to 240 & 270.

I can see that 141 boosts to 214, but that’s the highest boosted 4 I have this week. So I’m guessing it’s somewhere in the neighborhood of 170 to get to 240 and 205 to get to 270.

The 4 boosted 4*s this week are Antman, Prof. X, X-23 and StarLord. Here’s what I have:

Antman - level 209, boosted to 285
StarLord - level 135, boosted to 208
Prof. X - level 210, boosted to 286
X-23 - level 172, boosted to 247

So everyone is boosted 73-76 levels. It looks like your numbers are a little high. 166 or so will get you to 240 and 195ish will get you to 270.

If someone knew the exact formula then that would be great.

That helps, thanks!

I’m pretty sure 270 boosts to around 350.