**Value**

The Planck constant of action has the dimensionality of specific relative angular momentum (areal momentum) or angular momentum's intensity. In SI units, the Planck constant is expressed in joule seconds (J·s) or (N·m·s).

The value of the Planck constant is:

The value of the reduced Planck constant is:

The two digits inside the parentheses denote the standard uncertainty in the last two digits of the value. The figures cited here are the 2010 CODATA recommended values for the constants and their uncertainties. The 2010 CODATA results were made available in June 2011 and represent the best-known, internationally-accepted values for these constants, based on all data available as of 2010. New CODATA figures are scheduled to be published approximately every four years.

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