I know that in the past the system assigned the MP based on the rank of the monster no matter what the level. Now it has to be leveled to get the additional MP. I remember taking a huge hit on MP when that happened. The questions I have though are has anyone figured out how the actual value is calculated?

Obviously level means something now, but is it just monster level times some magic number gives its monster power?
Is there a difference in this number based on rarity?
Is there a difference in this number based on what rank they are leveled to?
Do runes make any difference? I am thinking they do not?
Same for relics?

Did you check Wiki , i think your answer is there

http://monster-wiki.com/monster-lab/rank-up/
and yes rune increase Mp . didn't test relics

@Haka-Taka So how do you figure the original mp? It does not describe that. In addition, is that number, say 200 for Legendary rank 1, is that just added when they are ranked up AND have been feed to that new max level?

A lot of it has to do with ranking. One of the higher players only has 250 unique monsters, but his mp is something like 300k because everything is ranked up to 130.

@Bruce-Hamilton said in How is monster power calculated:

A lot of it has to do with ranking. One of the higher players only has 250 unique monsters, but his mp is something like 300k because everything is ranked up to 130.

I read on Reddit that the original MP is just the level of the monster. So I am thinking that maybe it is as simple as level of monster plus rank bonus from the table that Haka posted. I have downloaded a spreadsheet of all of the monsters, I may go through my collection just to figure it out.

@Kaiju dont forget the runes

@Marianne-van-Es said in How is monster power calculated:

@Kaiju dont forget the runes

How does that work? I looked at the wiki link provided below and did not see anything.

Yes the original Mp is monster levels so 100 for a L with max 3 for the same monsters ,, meaning spamming pandaken ranking will not work only 3 will be taken into Mp
and yes to get full rank bonus you have to feed to max
and yes i was surprised as well when was told rune affect it , but you can try it , put level 1 on any monster and check then remove it and put level 2 , then 3
think level 3 give 16 point while x give 39 but not sure about those numbers