Steem vest ranks: Plankton < Minnow < Dolphin < Orca < Whale

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You've likely seen the marine-inspired categories used by many Steem explorers to rank users. These rankings are based on a user's vests (which IIUC at any given time is directly proportional to their STEEM Power). From small to large, these categories are Plankton, Minnow, Dolphin, Orca, and Whale. While I've read a few posts on these categories, I couldn't find what their actual definitions were.

When in doubt, check the source code! SteemPlus is a Chrome extension to add additional frontend tweaks to many Steem explorers. I took a look at the @steem-plus source code, which contains the following getUserRank javascript function:

function getUserRank (vests) {
  console.log('User vests: ',vests);
    var rank = 'Plankton';
    if (vests >= 1000000000) {
        rank = 'Whale';
    } else if (vests >= 100000000) {
        rank = 'Orca';
    } else if (vests >= 10000000) {
        rank = 'Dolphin';
    } else if (vests >= 1000000) {
        rank = 'Minnow';
    }
    return rank;
};

From https://steemd.com/ I found the current STEEM to million-VESTS conversion rate under the steem_per_mvests variable. As of 2018-03-20, this conversion factor is 489.974. In addition, steemd.com provides total_vesting_shares, which currently equals 385,445,381,997.9 VESTS. Using this total amount, I calculated "Share": what minimum percent of total vests a user needs to obtain a certain rank:

Rank	mVESTS	STEEM	Share
Plankton	0	0	0.0000%
Minnow	1	490	0.0003%
Dolphin	10	4,900	0.0026%
Orca	100	48,997	0.0259%
Whale	1,000	489,974	0.2594%

Now I don't fully understand the relationship between STEEM and VESTS and how the total supply of these measures will change over time. Furthermore, I believe you only receive VESTS on STEEM Power (excluding Power you've delegated). Therefore, if you want to achieve a certain rank you will need at least the number of STEEM in form of Power in the table above.

Would love for any comments!

References:

1. Eco-system of Steemit - Whales, Orcas, Dolphins, Minnows and Plankton
2. #Steemit101 : What's a Minnow, Dolphin, Whale, etc in terms of the numbers anyways? Resources for Steemit Noobs.