About the Units
grain (gr)
A unit of mass equal to 64.79891 milligrams, originally based on the weight of a grain of barley.
attogram (ag)
A unit of mass equal to 10^-18 grams or 10^-21 kilograms.
Common Conversions
- 1 gr = 64798900000000000.0 ag
- 1.543236e-17 gr = 1 ag