About the Units
grain (gr)
A unit of mass equal to 64.79891 milligrams, originally based on the weight of a grain of barley.
zeptogram (zg)
A unit of mass equal to 10^-21 grams or 10^-24 kilograms.
Common Conversions
- 1 gr = 64798913000000000000.0 zg
- 1.5432358e-20 gr = 1 zg