The Celsius scale is widely used for weather forecasts and everyday temperatures around the world. Fahrenheit is used most prominently in the United States. Travelers, international teams and anyone reading overseas weather information may therefore need to move between the two scales.
Celsius-to-Fahrenheit formula
Use: °F = (°C × 9/5) + 32. For example, 20°C becomes 68°F: multiply 20 by 1.8 to get 36, then add 32.
Useful temperature reference points
Zero degrees Celsius equals 32°F. Ten degrees Celsius equals 50°F. Twenty degrees Celsius equals 68°F, 30°C equals 86°F and 40°C equals 104°F.
Water freezes at approximately 0°C or 32°F under standard reference conditions. A commonly quoted boiling point of water is 100°C or 212°F at standard atmospheric pressure; actual boiling temperature varies with pressure and altitude.
Weather and travel
If you are accustomed to Celsius, a forecast expressed in Fahrenheit may initially be difficult to interpret. Knowing a few reference values is often enough for quick understanding: around 50°F is cool at 10°C, 68°F corresponds to 20°C, and 86°F corresponds to 30°C.
Why you cannot use one multiplication factor
The two scales have different zero points. Multiplying Celsius by 1.8 alone therefore does not produce Fahrenheit; 32 must be added afterward. The reverse formula is °C = (°F − 32) × 5/9.
Use the temperature converter
The Nujiz Unit Converter can perform the formula automatically. Select temperature, choose Celsius and Fahrenheit, enter the temperature and read the converted value.
Check a temperature:
Summary
To convert Celsius to Fahrenheit, multiply by 9/5 and add 32. Remembering a few familiar reference temperatures makes weather information easier to interpret even without performing the full calculation each time.