Fundamental Physical Constants from NIST
| Constants Topics: |
| Values |
| Energy Equivalents |
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| Background |
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| Constants, Units & Uncertainty home page |
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- Wall Chart and Wallet Card of the 2022 constants
- Background information related to the constants
- Links to selected scientific data
- Previous Values (2018) (2014) (2010) (2006) (2002) (1998) (1986) (1973) (1969) DEADLINE NOTICE The 2026 CODATA adjustment of the fundamental constants is the next regularly scheduled adjustment. Data being used in this adjustment is required to have been discussed in a publication preprint or a publication prior to 31 December 2026.
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Find the correlation coefficient
between any pair of constants
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See also
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NIST Standard Reference Database 121. Last Update to Data Content: May 2024.
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Online: October 1994 - Last update: May 2024