These rankings and bounties are for the new world, paradise and the other seas have different bounty system and rankings.
General Ranking
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S - Rank :
Low :- Usopp (after time skip)
Mid :- Vinsmoke Sanji and Brook (after time skip)
High :- Roronoa Zoro (after time skip)
Peak :- Monkey D Luffy (Just after time skip)
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SS - Rank :
Low :- Sweet commanders, Yonko division commanders, Don Quixote Dolflamingo
Mid :- Borsalino (before time skip) , Charlotte Katakuri, Marco_The Phoenix (before time skip)
High :- Sengoku (old), Monkey D Garp (old), Sakazuki (Pre time skip), Kuzan (before time skip),
Peak :- Edward Newgate (old), Sakazuki (After time skip), Charlotte Linlin (Big mom arc), Dracule Mihawk (before time skip)
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SSS - Rank :
Low :- Charlotte Linlin (Peak), Shanks (before time skip), Silvers Reighley (peak)
Mid :- Monkey D Garp (Peak), Sengoku (Peak), Kaido (peak)
High :- Edward Newgate (Peak), Gol D Roger
Peak :- ?????
.
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Navy rankings :
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Fleet Admiral ≥ SSS (Low)
[Grandmaster of Both kind of haki, High chance of having Conquerer's Haki]
Admiral ≥ SS (Mid)
[Haki specialist]
Vice Admiral ≥ S (High)
[Masters of Both kind of Haki]
Rear Admiral ≥ S (Low)
[Proficient in both kinds of Haki]
Commodore ≥ A (Mid)
[Proficient in any one kind of Haki]
Captain ≥ B (Peak)
[start to learn any one kind of Haki]
Commander ≥ B (low)
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There are :
3 Admirals under Fleet Admiral
5 Vice-Admirals under an Admiral
4 Rear-Admirals under a Vice-Admiral
5 Commodores under a Rear-Admiral
3 Captains under a Commodore
2 Commanders under a Captain
.
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Pirate rankings :
Yonko ≥ SSS (low)
[Grandmaster of all three Haki]
{ ≥ 3,000,000,000 Berri }
Yonko division commanders ≥ SS (low)
[Haki specialist]
{ ≥ 1,000,000,000 Berri }
Shichibukai ≥ S (low)
{ ≥ 500,000,000 Berri }
A-Ranked pirates
{ ≥ 100,000,000 Berri }