In physics, an accepted value is a numerical value for a physical constant or other quantity that has been widely agreed upon by the scientific community. Accepted values are typically based on a consensus of the best available experimental data, and are often published in reference works such as the NIST Reference on Constants, Units, and Uncertainty.

Some examples of accepted values in physics include:

- The speed of light in a vacuum: 299,792,458 meters per second (exactly)

- The mass of an electron: 9.1093837015(28) × 10^{−31} kilograms

- The Planck constant: 6.62607015 × 10^{−34} joule-seconds

- The Avogadro constant: 6.02214076 × 10^{23} particles per mole

Accepted values are important in physics because they allow scientists to compare their results with others, and to build upon the work of previous researchers. They also help to ensure that the scientific community is using consistent units and definitions, which is essential for communication and collaboration.

It is important to note that accepted values are not necessarily constant. As new experimental data becomes available, accepted values may be revised to reflect the most up-to-date understanding of the physical world.