What is the diminishing return formula for magic find?

Solution 1:

I have personally seen the stats showing diminishing returns.. at about 40% each point you put on shows up less points when you look at your stats. at 50% I put on a 7% item and only got 2% I hope this helps..

Solution 2:

Tested in solo(Private game): Current set I was wearing had 21% magic find.

Added a 10% belt.

31%MF

Switched pants from 0% to 12%

43%MF

Switched a 21% hat to a 25% hat.

47%MF

The percentage shown in details does not reflect this theory.

Solution 3:

I have a barb in Act 2 inferno and I have been following the game since 2008...

BASHIOK Q/A:

"QUESTION ASKER: Is Magic Find using diminishing returns in the same way as in Diablo II, where Magic Find stat affected in a different way the chance for blue, yellow and gold drops (actual bonus of MF was diminished for rarest items)? BASHIOK: No, it’s a literal (and lateral) improvement across the board. We may tweak it but that’s the way it is right now."

It doesn't include diminishing returns at the moment according to Bash. This was pretty much confirmed in a tweet Bashiok posted a couple of days ago.

Your welcome question asker.