| Constants Topics: |
| Values |
| Energy Equivalents |
| Searchable Bibliography |
| Background |
| Constants Bibliography |
| Constants, Units & Uncertainty home page |
Version history and disclaimer
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- See also
- Detailed articles on the 2022 adjustment of the values of the constants
- 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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NIST Standard Reference Database 121. Last Update to Data Content: May 2024.
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Online: October 1994 - Last update: May 2024