About the Units
attogram (ag)
A unit of mass equal to 10^-18 grams or 10^-21 kilograms.
kilogram (kg)
The SI base unit of mass, defined as the mass of the International Prototype Kilogram.
Common Conversions
- 1 ag = 1.0000001e-21 kg
- 999999950000000000000.0 ag = 1 kg