Committee on Data for Science and Technology (CODATA)

A committee set up by the International Council of Scientific Unions in 1966 to improve the compilation, critical evaluation, storage and retrieval of data of importance to science and technology. The committee consists principally of representatives of the various national standards laboratories, as well as the BIPM. CODATA periodically issues reports identifying the best current values for the principal physical constants, and also for certain conversion factors. For current CODATA values, see

A very good article on the origin and nature of the CODATA set of constants is

Peter J. Mohr, and Barry N. Taylor.
Adjusting the Values of the Fundamental Constants.
Physics Today vol 54, issue 3, 29 (2001)


Past reports:



P. J. Mohr and B. N. Taylor.
Reviews of Modern Physics, vol. 77, no. 1, pages 1-107, (2005).


Peter J. Mohr and Barry N. Taylor.
CODATA Recommended Values of the Fundamental Physical Constants: 1998.
Journal of Physical and Chemical Reference Data, volume 28, no. 6, pages 1713-1852 (1999).

Also in Reviews of Modern Physics, volume 72, no. 2, pages 351-495 (2000).


E. R. Cohen and B. N. Taylor.
The 1986 adjustment of the fundamental physical constants.
CODATA Bulletin, Number 63, November 1986.
Pergamon Press (Oxford, UK, and Elmsford, NY)

     Reprinted in Review of Modern Physics (USA), volume 59, page 1121 (1988).


Recommended Consistent Values of the Fundamental Physical Constants, 1973, a Report of the CODATA Task Group on Fundamental Constants.
CODATA Bulletin 11.
CODATA Secretariat, 51 Blvd. de Montmorency, 75016 Paris, France (August 1973).

E. R. Cohen and B. N. Taylor.
J. Phys. Chem. Ref. Data (USA), volume 2, page 263 (1973). {CHECK--page 663??}


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