About the Units
grain (gr)
A unit of mass equal to 64.79891 milligrams, originally based on the weight of a grain of barley.
assay ton (AT)
A unit of mass equal to 29.167 grams, used in precious metal assaying.
Common Conversions
- 1 gr = 0.0022216765 AT
- 450.11053 gr = 1 AT