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