About the Units
grain (gr)
A unit of mass equal to 64.79891 milligrams, originally based on the weight of a grain of barley.
femtogram (fg)
A unit of mass equal to 10^-15 grams or 10^-18 kilograms.
Common Conversions
- 1 gr = 64798906000000.0 fg
- 1.543236e-14 gr = 1 fg