How to use the celsius to fahrenheit converter
Enter the temperature in degrees Celsius. The calculator multiplies it by 9/5 and adds 32.
Celsius to Fahrenheit formula
The Celsius and Fahrenheit scales have different zero points and interval sizes, so this is not a simple multiplication-only conversion.
Example: Lily converts a weather forecast
Lily sees a forecast of 20°C. Multiplying 20 by 9/5 and adding 32 gives 68°F. The temperature scales also agree at −40°, where −40°C equals −40°F.
For a temperature change rather than an actual temperature reading, multiply the Celsius change by 9/5 without adding 32.
Celsius to Fahrenheit formula explained
Multiply the Celsius temperature by 1.8 and then add 32. The multiplication accounts for the different degree size, while adding 32 accounts for the offset between the two scales.
Because the relationship is linear, the formula works for positive and negative temperatures. At -40 degrees, Celsius and Fahrenheit have the same numeric value.
Common Celsius-to-Fahrenheit conversions
0 C
32 F - freezing-point reference for water.
20 C
68 F - common indoor-temperature reference.
30 C
86 F - warm-weather reference.
100 C
212 F - boiling-point reference at standard atmospheric pressure.
Assumptions and limitations
What the estimate assumes
This converts temperature scales only and does not account for measurement uncertainty.
Sources and reference material
Celsius to Fahrenheit Converter FAQs
What is 20°C in Fahrenheit?
68°F.
What is 0°C in Fahrenheit?
32°F.
What temperature is the same in Celsius and Fahrenheit?
-40 degrees is the same numerical value on both scales.
Can Celsius go below zero?
Yes. The Celsius scale includes negative temperatures.
How do I convert Celsius to Fahrenheit?
Multiply degrees Celsius by 1.8, then add 32. The equivalent formula is F = C x 9/5 + 32.
What is 20 C in Fahrenheit?
20 C equals 68 F exactly.
Temperature-scale conversion for general use.