pg

picogram

Massexact by definition

The picogram is 10⁻¹⁵ kilograms, one trillionth of a gram, exact as a stack of SI prefixes. It is the working unit of single-cell biology: a typical mammalian cell weighs a few hundred picograms and the DNA in a human cell about 6 pg.

1 pg 1.0000000e-15 kg