Fahrenheit and Celsius are two different temperature scales that use different zero points and step sizes to describe how hot or cold something is.

Core differences

  • Freezing point of water
    • Celsius: 0 °C.
* Fahrenheit: 32 °F.
  • Boiling point of water (at normal pressure)
    • Celsius: 100 °C.
* Fahrenheit: 212 °F.
  • Size of one degree
    • Between freezing and boiling, Celsius has 100 steps, so each degree is larger.
* Fahrenheit has 180 steps between the same points, so each degree is smaller and more “fine-grained.”
  • Names and symbols
    • Celsius: named after Anders Celsius, written as °C.
* Fahrenheit: named after Daniel Gabriel Fahrenheit, written as °F.
  • Where they’re commonly used
    • Celsius: used by most of the world and in science and medicine.
* Fahrenheit: mainly used in the United States for everyday weather, cooking, and body temperature.

How to convert between them

  • Exact formulas:
    • From Celsius to Fahrenheit:
      °F=95°C+32°F=\frac{9}{5}°C+32°F=59​°C+32
* From Fahrenheit to Celsius:

°C=59(°F−32)°C=\frac{5}{9}(°F-32)°C=95​(°F−32)

  • Example:
    • 0 °C → °F=95×0+32=32°F=\frac{9}{5}\times 0+32=32°F=59​×0+32=32 °F (freezing point of water).
* 100 °C → °F=95×100+32=212°F=\frac{9}{5}\times 100+32=212°F=59​×100+32=212 °F (boiling point of water).

A neat fact: both scales meet at −40, so −40 °C = −40 °F.

Simple story-style picture

Imagine two friends describing the same chilly morning:

One says, “It’s 0 degrees out here!” and means 0 °C, just at freezing.
The other replies, “No, it’s 32 degrees!” meaning 32 °F.

They feel the same air, but their thermometers speak different “languages” about temperature. Both are correct; they just use different starting points and step sizes.

Information gathered from public forums or data available on the internet and portrayed here.