The SI base unit for mass is: kilogram (kg)
1 lb = 0.453 592 4 kg
1 oz = 0.028 349 52 kg
1 slug = 14.593 9 kg
1 lb = 0.453 592 4 kg
1 oz = 0.028 349 52 kg
When dealing with gold or precious metals the unit used to measure weight is the Troy ounce
which is equal to 31.103 476 8 gram.