API gravity is inversally proportional to the specific gravity. so if the value of spcific gravity for some material is higher , it means that the API gravity of the same material will be lower.

46.49

=57.04

See related link "API Gravity" for more information

°API = [ 141.5 / (SG @ 60°F) ] - 131.5

SG= specific gravity (always taken at 60°F when calculating API)

The Formula for convert API gravity to pounds per gallon is:

Pounds per Gallon = (141.5/(API Gavity+131.5))*8.3378 <--[which is weight of fresh water]

API of 10 is same as weight of water. API >10 will float