100+ fundamental physical constants from the CODATA 2018 recommended values. Click any row to copy the value. Search by name or symbol, filter by category. Also: Calculator | Units | Astrophysics.
Showing 100 constants
Symbol
Name
Value
Unit
Uncertainty
Source: CODATA 2018 Internationally Recommended Values of the Fundamental Physical Constants (NIST). Values are in SI units unless otherwise noted. Click on any row to copy the constant value to clipboard. Uncertainty is the standard uncertainty in the last significant digits.
