In 1 fahrenheit there are -17.222222 celsius. Meanwhile in 1 celsius there are 33.8 fahrenheit. Keep reading to learn more about each unit of measure and how they are calculated. Or just use the Celsius to Fahrenheit calculator above to convert any number.
* Values rounded to 6 decimal places for readability
To convert Fahrenheit to Celsius (°C), use this formula:
°C = (°F − 32) × 5/9
Steps:
Quick check points:
Example:
Use this formula to convert Fahrenheit to Celsius:
°C = (°F − 32) × 5/9
Subtract 32 from the Fahrenheit value, then multiply by 5, then divide by 9.
Example: 68°F
(68 − 32) × 5/9 = 36 × 5/9 = 20°C
A quick estimate is:
This gets close for everyday temps. Example: 70°F
(70 − 30) / 2 = 20°C (exact is about 21°C)
Fahrenheit and Celsius start at different zero points. In Fahrenheit, water freezes at 32°F. In Celsius, water freezes at 0°C. Subtracting 32 lines up the freezing point before scaling the rest.
The degree sizes are different. Between freezing and boiling, Celsius has 100 degrees (0 to 100). Fahrenheit has 180 degrees (32 to 212). The ratio 100/180 simplifies to 5/9, so you multiply by 5/9 to match the Celsius scale.
32°F = 0°C
This is the freezing point of water at sea level.
212°F = 100°C
This is the boiling point of water at sea level.
0°F = −17.78°C (about −18°C)
This is a common winter reference point in Fahrenheit.
98.6°F = 37°C
This is the average normal human body temperature.
They match at −40 degrees.
−40°F = −40°C
Use the same formula: °C = (°F − 32) × 5/9.
Negative values work the same way.
Example: −4°F
(−4 − 32) × 5/9 = −36 × 5/9 = −20°C
No. Celsius is lower than Fahrenheit for most everyday temps, but not always. At −40, they are equal. Below −40, Celsius becomes higher than Fahrenheit (less negative).
It depends on your use:
For a fast mental method:
Common anchors help:
The Calculate Box tool to convert fahrenheit to celsius uses the open source script Convert.js to convert units of measurement. To use this tool, simply type a fahrenheit value in the box and have it instantly converted to celsius.