About the Units
grain (gr)
A unit of mass equal to 64.79891 milligrams, originally based on the weight of a grain of barley.
gigagram (Gg)
A unit of mass equal to 10^9 grams or 10^6 kilograms.
Common Conversions
- 1 gr = 6.479891e-11 Gg
- 15432359000.0 gr = 1 Gg