1B+ for Luffy, 500M+ for Zoro and Sanji (and maybe for someone unexpected like Usopp or Bonney) and 300M+ for others
Luffy - 4,000,000,000 or 4,000,290,000
Zoro - around 1,611,100,000
Sanji - 1,532,000,000
Jinbe - 1,400,000,000
Robin - 1,230,000,000 (or even lower)
Usopp - 1,000,000,000 or 800,000,000
Bonney - 820,000,000 or 620,000,000
Franky - 694,000,000
Brook - 683,000,000
Nami - 666,000,000
Chopper - 100,001,000