temperature · International · Modern
SI base unit of thermodynamic temperature. The Boltzmann constant is fixed exactly at 1.380649×10^-23 J/K.
Converter
temperature · International / Europe · Modern / historical
degree Fahrenheit
°Fexact
- Record
- M302
- Definition quality
- Standardized
- Conversion mode
- offset
- Calculator
- Fully calculable
Definition
Fahrenheit temperature converts to Celsius by t°C = (t°F - 32)×5/9; temperature intervals scale by 5/9.
Reference value
°C = (°F - 32) × 5/9
History & use
Fahrenheit remains an everyday temperature scale in the United States; NIST conversion guidance treats it as an offset scale.
Modern use
Modern-use scope is context-dependent; the website should follow the record's current-status and regional/system labels rather than imply universal use.
Did you know?
The famous -40 point is the same numerical temperature on the Celsius and Fahrenheit scales.
Sources & evidence
Source tier Tier A · confidence High
Related measurements
temperature · International · Modern
Celsius temperature is defined from thermodynamic temperature by t/°C = T/K - 273.15.