Convert Gram (g) to Atomic Mass Unit (u) instantly.
About these units
Gram (g)
The gram is one-thousandth of a kilogram and is widely used in everyday life for measuring food, medicines, small components, and scientific samples. Its scale is convenient for objects too light to measure in kilograms yet too heavy for milligrams. Chemists, biologists, and lab technicians rely heavily on grams to quantify reagents, biological specimens, powders, and liquids. The gram appears frequently in nutrition labels, recipes, and manufacturing specifications. As a metric unit, the gram benefits from simplicity and ease of conversion—just move the decimal to reach milligrams or kilograms. Its intuitive scale makes it one of the most universally recognized units in the world.
Atomic Mass Unit (u)
The atomic mass unit (u) is defined as exactly 1/12 the mass of a neutral carbon-12 atom, which makes it approximately 1.66053906660 × 10⁻²⁷ kilograms. This definition allows scientists to express atomic and molecular masses in a convenient, intuitive scale that aligns with the structure of the periodic table. By anchoring the unit to carbon-12, chemists and physicists gained a universal reference point that harmonizes molecular weight, relative isotopic abundance, and mass spectroscopy results. The atomic mass unit effectively normalizes the complexity of atomic masses into whole-number or near-whole-number values for most nuclei. In chemistry, u is indispensable for calculating molar masses, reaction stoichiometry, and isotopic compositions. It is also used across nuclear physics, astrophysics, and biophysics, demonstrating the universality of atomic-scale measurement.