Unranked (levels 1-10) = +1 to all 5 stats = total 5 stats points for each level up.
D rank (11-25) = +1 to all 5 stats and +5 free stat points - total 10 stat points per level up.
C rank (26-45) = +1 to all 5 stats and +10 free stat points - total 15 stat points per level up.
B rank (46-70) = +1 to all stats and +15 free stat points - total 20 points per level up.
A rank (71-100) = +1 to all stats and +20 free stat points - total 25 stat points per level up.
Total stats at each rank peak...
Level 10 Unranked - 50 total
Level 25 (D rank peak) - 50+150 - 200 total
Level 45 (C rank peak) - 200+300 - 500 total
Level 70 (B rank peak) - 500+500 - 1000 total
Level 100 (A rank peak) - 1000+750 - 1750 total
Rank up to Demigod = +50 to all stats = 1750+250= 2000 total
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Even for monsters, total stats are the same. But, there are no free stat points. Instead, every point will be allocated according to their physique and battle style.
Eg; A Tortoise shaped monster might get allocated all it's free stat points into vitality since it's main focus is defense.
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Not all species start at level 1.
Some intellectual beings and monsters due to their innate strength from birth, will have levels corresponding to their total stats points at the beginning.
Since humans are inherently weak, most of them will start at level 1.
If someone has stats higher than average (i.e., more than 1 in any of the 5 basic stats), they will start at level 2 with all of their stats raised to the same level.