picogram [pg] Unit Converter

Definition of picogram [pg] unit

A picogram is a metric unit of mass equal to one trillionth of a gram, or 10⁻¹² gram. It equals 10⁻¹⁵ kilogram and is commonly used to describe extremely small quantities of matter.

History of picogram [pg] unit

The picogram belongs to the International System of Units’ metric tradition, where the prefix pico- denotes a factor of 10⁻¹². The prefix was adopted internationally in 1960, when the modern SI system formalized a consistent set of decimal prefixes for scientific measurement. It derives from the Italian piccolo, meaning “small.” As analytical instruments became more sensitive during the twentieth century, the picogram gained importance for expressing masses far below milligram and microgram levels, particularly in chemistry, biology, and environmental science. It is defined relative to the gram.

Applications of picogram [pg] unit

Picograms are used when measuring trace-level substances, including hormones, toxins, pollutants, DNA, proteins, and nanoparticles. Laboratories may report drug concentrations or biomarker quantities in picograms per milliliter, while mass spectrometry and molecular biology use the unit for highly sensitive analyses. Environmental monitoring also employs picograms to quantify persistent contaminants in air, water, or biological samples.

Complete list of picogram [pg] unit conversion