Convert Celsius to Fahrenheit or Fahrenheit to Celsius. Select the direction and enter a temperature, including negative values.
Fahrenheit = Celsius × 9/5 + 32. Celsius = (Fahrenheit − 32) × 5/9.
0°C = 32°F; 100°C = 212°F; −40°C = −40°F. The two scales meet at −40.
This converts a temperature value, not a temperature interval. A change of 10°C equals a change of 18°F without adding 32. The calculator performs arithmetic even for values outside physically possible absolute temperatures.
Editorial responsibility: Nicolas Belotti · Methods and testing · Report an error
English edition: 16 September 2026.